Protect yourself against future threats.
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===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2019.0253.3
Linux kernel vulnerabilities
8 February 2019
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: kernel
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Root Compromise -- Existing Account
Increased Privileges -- Existing Account
Access Privileged Data -- Existing Account
Denial of Service -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2018-19407 CVE-2018-18281 CVE-2018-17972
CVE-2018-16882 CVE-2018-14625 CVE-2018-10883
CVE-2018-10882 CVE-2018-10880 CVE-2018-10879
CVE-2018-10878 CVE-2018-10877 CVE-2018-10876
CVE-2018-9516
Reference: ESB-2019.0138
ESB-2018.3645
ESB-2018.3584
Original Bulletin:
http://www.ubuntu.com/usn/usn-3871-1
http://www.ubuntu.com/usn/usn-3871-2
http://www.ubuntu.com/usn/usn-3871-3
http://www.ubuntu.com/usn/usn-3871-4
http://www.ubuntu.com/usn/usn-3871-5
Comment: This bulletin contains five (5) Ubuntu security advisories.
Revision History: February 8 2019: Added USN-3871-5 for Azure kernels
February 5 2019: USN-3871-2 to USN-3871-4 added
(regression fix + other releases)
January 30 2019: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
==========================================================================
Ubuntu Security Notice USN-3871-1
January 29, 2019
linux vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- - Ubuntu 18.04 LTS
Summary:
Several security issues were fixed in the Linux kernel.
Software Description:
- - linux: Linux kernel
Details:
Wen Xu discovered that a use-after-free vulnerability existed in the ext4
filesystem implementation in the Linux kernel. An attacker could use this
to construct a malicious ext4 image that, when mounted, could cause a
denial of service (system crash) or possibly execute arbitrary code.
(CVE-2018-10876, CVE-2018-10879)
Wen Xu discovered that a buffer overflow existed in the ext4 filesystem
implementation in the Linux kernel. An attacker could use this to construct
a malicious ext4 image that, when mounted, could cause a denial of service
(system crash) or possibly execute arbitrary code. (CVE-2018-10877)
Wen Xu discovered that an out-of-bounds write vulnerability existed in the
ext4 filesystem implementation in the Linux kernel. An attacker could use
this to construct a malicious ext4 image that, when mounted, could cause a
denial of service (system crash) or possibly execute arbitrary code.
(CVE-2018-10878, CVE-2018-10882)
Wen Xu discovered that the ext4 filesystem implementation in the Linux
kernel did not properly ensure that xattr information remained in inode
bodies. An attacker could use this to construct a malicious ext4 image
that, when mounted, could cause a denial of service (system crash).
(CVE-2018-10880)
Wen Xu discovered that the ext4 file system implementation in the Linux
kernel could possibly perform an out of bounds write when updating the
journal for an inline file. An attacker could use this to construct a
malicious ext4 image that, when mounted, could cause a denial of service
(system crash). (CVE-2018-10883)
It was discovered that a race condition existed in the vsock address family
implementation of the Linux kernel that could lead to a use-after-free
condition. A local attacker in a guest virtual machine could use this to
expose sensitive information (host machine kernel memory). (CVE-2018-14625)
Cfir Cohen discovered that a use-after-free vulnerability existed in the
KVM implementation of the Linux kernel, when handling interrupts in
environments where nested virtualization is in use (nested KVM
virtualization is not enabled by default in Ubuntu kernels). A local
attacker in a guest VM could possibly use this to gain administrative
privileges in a host machine. (CVE-2018-16882)
Jann Horn discovered that the procfs file system implementation in the
Linux kernel did not properly restrict the ability to inspect the kernel
stack of an arbitrary task. A local attacker could use this to expose
sensitive information. (CVE-2018-17972)
Jann Horn discovered that the mremap() system call in the Linux kernel did
not properly flush the TLB when completing, potentially leaving access to a
physical page after it has been released to the page allocator. A local
attacker could use this to cause a denial of service (system crash), expose
sensitive information, or possibly execute arbitrary code. (CVE-2018-18281)
Wei Wu discovered that the KVM implementation in the Linux kernel did not
properly ensure that ioapics were initialized. A local attacker could use
this to cause a denial of service (system crash). (CVE-2018-19407)
It was discovered that the debug interface for the Linux kernel's HID
subsystem did not properly perform bounds checking in some situations. An
attacker with access to debugfs could use this to cause a denial of service
or possibly gain additional privileges. (CVE-2018-9516)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 18.04 LTS:
linux-image-4.15.0-44-generic 4.15.0-44.47
linux-image-4.15.0-44-generic-lpae 4.15.0-44.47
linux-image-4.15.0-44-lowlatency 4.15.0-44.47
linux-image-4.15.0-44-snapdragon 4.15.0-44.47
linux-image-generic 4.15.0.44.46
linux-image-generic-lpae 4.15.0.44.46
linux-image-lowlatency 4.15.0.44.46
linux-image-snapdragon 4.15.0.44.46
After a standard system update you need to reboot your computer to make
all the necessary changes.
ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
linux-powerpc), a standard system upgrade will automatically perform
this as well.
References:
https://usn.ubuntu.com/usn/usn-3871-1
CVE-2018-10876, CVE-2018-10877, CVE-2018-10878, CVE-2018-10879,
CVE-2018-10880, CVE-2018-10882, CVE-2018-10883, CVE-2018-14625,
CVE-2018-16882, CVE-2018-17972, CVE-2018-18281, CVE-2018-19407,
CVE-2018-9516
Package Information:
https://launchpad.net/ubuntu/+source/linux/4.15.0-44.47
- -------------------------------------------------------------------------------
==========================================================================
Ubuntu Security Notice USN-3871-2
January 31, 2019
linux regression
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- - Ubuntu 18.04 LTS
Summary:
Multiple regressions were fixed in the Linux kernel.
Software Description:
- - linux: Linux kernel
Details:
USN-3871-1 fixed vulnerabilities in the Linux kernel for Ubuntu 18.04
LTS. Unfortunately, that update introduced regressions with docking
station displays and mounting ext4 file systems with the meta_bg
option enabled. This update fixes the problems.
We apologize for the inconvenience.
Original advisory details:
Wen Xu discovered that a use-after-free vulnerability existed in the ext4
filesystem implementation in the Linux kernel. An attacker could use this
to construct a malicious ext4 image that, when mounted, could cause a
denial of service (system crash) or possibly execute arbitrary code.
(CVE-2018-10876, CVE-2018-10879)
Wen Xu discovered that a buffer overflow existed in the ext4 filesystem
implementation in the Linux kernel. An attacker could use this to construct
a malicious ext4 image that, when mounted, could cause a denial of service
(system crash) or possibly execute arbitrary code. (CVE-2018-10877)
Wen Xu discovered that an out-of-bounds write vulnerability existed in the
ext4 filesystem implementation in the Linux kernel. An attacker could use
this to construct a malicious ext4 image that, when mounted, could cause a
denial of service (system crash) or possibly execute arbitrary code.
(CVE-2018-10878, CVE-2018-10882)
Wen Xu discovered that the ext4 filesystem implementation in the Linux
kernel did not properly ensure that xattr information remained in inode
bodies. An attacker could use this to construct a malicious ext4 image
that, when mounted, could cause a denial of service (system crash).
(CVE-2018-10880)
Wen Xu discovered that the ext4 file system implementation in the Linux
kernel could possibly perform an out of bounds write when updating the
journal for an inline file. An attacker could use this to construct a
malicious ext4 image that, when mounted, could cause a denial of service
(system crash). (CVE-2018-10883)
It was discovered that a race condition existed in the vsock address family
implementation of the Linux kernel that could lead to a use-after-free
condition. A local attacker in a guest virtual machine could use this to
expose sensitive information (host machine kernel memory). (CVE-2018-14625)
Cfir Cohen discovered that a use-after-free vulnerability existed in the
KVM implementation of the Linux kernel, when handling interrupts in
environments where nested virtualization is in use (nested KVM
virtualization is not enabled by default in Ubuntu kernels). A local
attacker in a guest VM could possibly use this to gain administrative
privileges in a host machine. (CVE-2018-16882)
Jann Horn discovered that the procfs file system implementation in the
Linux kernel did not properly restrict the ability to inspect the kernel
stack of an arbitrary task. A local attacker could use this to expose
sensitive information. (CVE-2018-17972)
Jann Horn discovered that the mremap() system call in the Linux kernel did
not properly flush the TLB when completing, potentially leaving access to a
physical page after it has been released to the page allocator. A local
attacker could use this to cause a denial of service (system crash), expose
sensitive information, or possibly execute arbitrary code. (CVE-2018-18281)
Wei Wu discovered that the KVM implementation in the Linux kernel did not
properly ensure that ioapics were initialized. A local attacker could use
this to cause a denial of service (system crash). (CVE-2018-19407)
It was discovered that the debug interface for the Linux kernel's HID
subsystem did not properly perform bounds checking in some situations. An
attacker with access to debugfs could use this to cause a denial of service
or possibly gain additional privileges. (CVE-2018-9516)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 18.04 LTS:
linux-image-4.15.0-45-generic 4.15.0-45.48
linux-image-4.15.0-45-generic-lpae 4.15.0-45.48
linux-image-4.15.0-45-lowlatency 4.15.0-45.48
linux-image-4.15.0-45-snapdragon 4.15.0-45.48
linux-image-generic 4.15.0.45.47
linux-image-generic-lpae 4.15.0.45.47
linux-image-lowlatency 4.15.0.45.47
linux-image-snapdragon 4.15.0.45.47
After a standard system update you need to reboot your computer to make
all the necessary changes.
ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
linux-powerpc), a standard system upgrade will automatically perform
this as well.
References:
https://usn.ubuntu.com/usn/usn-3871-2
https://usn.ubuntu.com/usn/usn-3871-1
https://launchpad.net/bugs/1813663, https://launchpad.net/bugs/1813727
Package Information:
https://launchpad.net/ubuntu/+source/linux/4.15.0-45.48
- -------------------------------------------------------------------------------
==========================================================================
Ubuntu Security Notice USN-3871-3
February 04, 2019
linux-aws, linux-gcp, linux-kvm, linux-oem, linux-raspi2 vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- - Ubuntu 18.04 LTS
Summary:
Several security issues were fixed in the Linux kernel.
Software Description:
- - linux-aws: Linux kernel for Amazon Web Services (AWS) systems
- - linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems
- - linux-kvm: Linux kernel for cloud environments
- - linux-oem: Linux kernel for OEM processors
- - linux-raspi2: Linux kernel for Raspberry Pi 2
Details:
Wen Xu discovered that a use-after-free vulnerability existed in the ext4
filesystem implementation in the Linux kernel. An attacker could use this
to construct a malicious ext4 image that, when mounted, could cause a
denial of service (system crash) or possibly execute arbitrary code.
(CVE-2018-10876, CVE-2018-10879)
Wen Xu discovered that a buffer overflow existed in the ext4 filesystem
implementation in the Linux kernel. An attacker could use this to construct
a malicious ext4 image that, when mounted, could cause a denial of service
(system crash) or possibly execute arbitrary code. (CVE-2018-10877)
Wen Xu discovered that an out-of-bounds write vulnerability existed in the
ext4 filesystem implementation in the Linux kernel. An attacker could use
this to construct a malicious ext4 image that, when mounted, could cause a
denial of service (system crash) or possibly execute arbitrary code.
(CVE-2018-10878, CVE-2018-10882)
Wen Xu discovered that the ext4 filesystem implementation in the Linux
kernel did not properly ensure that xattr information remained in inode
bodies. An attacker could use this to construct a malicious ext4 image
that, when mounted, could cause a denial of service (system crash).
(CVE-2018-10880)
Wen Xu discovered that the ext4 file system implementation in the Linux
kernel could possibly perform an out of bounds write when updating the
journal for an inline file. An attacker could use this to construct a
malicious ext4 image that, when mounted, could cause a denial of service
(system crash). (CVE-2018-10883)
It was discovered that a race condition existed in the vsock address family
implementation of the Linux kernel that could lead to a use-after-free
condition. A local attacker in a guest virtual machine could use this to
expose sensitive information (host machine kernel memory). (CVE-2018-14625)
Cfir Cohen discovered that a use-after-free vulnerability existed in the
KVM implementation of the Linux kernel, when handling interrupts in
environments where nested virtualization is in use (nested KVM
virtualization is not enabled by default in Ubuntu kernels). A local
attacker in a guest VM could possibly use this to gain administrative
privileges in a host machine. (CVE-2018-16882)
Jann Horn discovered that the procfs file system implementation in the
Linux kernel did not properly restrict the ability to inspect the kernel
stack of an arbitrary task. A local attacker could use this to expose
sensitive information. (CVE-2018-17972)
Jann Horn discovered that the mremap() system call in the Linux kernel did
not properly flush the TLB when completing, potentially leaving access to a
physical page after it has been released to the page allocator. A local
attacker could use this to cause a denial of service (system crash), expose
sensitive information, or possibly execute arbitrary code. (CVE-2018-18281)
Wei Wu discovered that the KVM implementation in the Linux kernel did not
properly ensure that ioapics were initialized. A local attacker could use
this to cause a denial of service (system crash). (CVE-2018-19407)
It was discovered that the debug interface for the Linux kernel's HID
subsystem did not properly perform bounds checking in some situations. An
attacker with access to debugfs could use this to cause a denial of service
or possibly gain additional privileges. (CVE-2018-9516)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 18.04 LTS:
linux-image-4.15.0-1027-gcp 4.15.0-1027.28
linux-image-4.15.0-1029-kvm 4.15.0-1029.29
linux-image-4.15.0-1031-raspi2 4.15.0-1031.33
linux-image-4.15.0-1032-aws 4.15.0-1032.34
linux-image-4.15.0-1033-oem 4.15.0-1033.38
linux-image-aws 4.15.0.1032.31
linux-image-gcp 4.15.0.1027.29
linux-image-gke 4.15.0.1027.29
linux-image-kvm 4.15.0.1029.29
linux-image-oem 4.15.0.1033.38
linux-image-raspi2 4.15.0.1031.29
After a standard system update you need to reboot your computer to make
all the necessary changes.
ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
linux-powerpc), a standard system upgrade will automatically perform
this as well.
References:
https://usn.ubuntu.com/usn/usn-3871-3
https://usn.ubuntu.com/usn/usn-3871-1
CVE-2018-10876, CVE-2018-10877, CVE-2018-10878, CVE-2018-10879,
CVE-2018-10880, CVE-2018-10882, CVE-2018-10883, CVE-2018-14625,
CVE-2018-16882, CVE-2018-17972, CVE-2018-18281, CVE-2018-19407,
CVE-2018-9516
Package Information:
https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1032.34
https://launchpad.net/ubuntu/+source/linux-gcp/4.15.0-1027.28
https://launchpad.net/ubuntu/+source/linux-kvm/4.15.0-1029.29
https://launchpad.net/ubuntu/+source/linux-oem/4.15.0-1033.38
https://launchpad.net/ubuntu/+source/linux-raspi2/4.15.0-1031.33
- -------------------------------------------------------------------------------
==========================================================================
Ubuntu Security Notice USN-3871-4
February 04, 2019
linux-hwe, linux-aws-hwe, linux-gcp vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- - Ubuntu 16.04 LTS
Summary:
Several security issues were fixed in the Linux kernel.
Software Description:
- - linux-aws-hwe: Linux kernel for Amazon Web Services (AWS-HWE) systems
- - linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems
- - linux-hwe: Linux hardware enablement (HWE) kernel
Details:
USN-3871-1 fixed vulnerabilities in the Linux kernel for Ubuntu 18.04
LTS. This update provides the corresponding updates for the Linux
Hardware Enablement (HWE) kernel from Ubuntu 18.04 LTS for Ubuntu
16.04 LTS.
Wen Xu discovered that a use-after-free vulnerability existed in the ext4
filesystem implementation in the Linux kernel. An attacker could use this
to construct a malicious ext4 image that, when mounted, could cause a
denial of service (system crash) or possibly execute arbitrary code.
(CVE-2018-10876, CVE-2018-10879)
Wen Xu discovered that a buffer overflow existed in the ext4 filesystem
implementation in the Linux kernel. An attacker could use this to construct
a malicious ext4 image that, when mounted, could cause a denial of service
(system crash) or possibly execute arbitrary code. (CVE-2018-10877)
Wen Xu discovered that an out-of-bounds write vulnerability existed in the
ext4 filesystem implementation in the Linux kernel. An attacker could use
this to construct a malicious ext4 image that, when mounted, could cause a
denial of service (system crash) or possibly execute arbitrary code.
(CVE-2018-10878, CVE-2018-10882)
Wen Xu discovered that the ext4 filesystem implementation in the Linux
kernel did not properly ensure that xattr information remained in inode
bodies. An attacker could use this to construct a malicious ext4 image
that, when mounted, could cause a denial of service (system crash).
(CVE-2018-10880)
Wen Xu discovered that the ext4 file system implementation in the Linux
kernel could possibly perform an out of bounds write when updating the
journal for an inline file. An attacker could use this to construct a
malicious ext4 image that, when mounted, could cause a denial of service
(system crash). (CVE-2018-10883)
It was discovered that a race condition existed in the vsock address family
implementation of the Linux kernel that could lead to a use-after-free
condition. A local attacker in a guest virtual machine could use this to
expose sensitive information (host machine kernel memory). (CVE-2018-14625)
Cfir Cohen discovered that a use-after-free vulnerability existed in the
KVM implementation of the Linux kernel, when handling interrupts in
environments where nested virtualization is in use (nested KVM
virtualization is not enabled by default in Ubuntu kernels). A local
attacker in a guest VM could possibly use this to gain administrative
privileges in a host machine. (CVE-2018-16882)
Jann Horn discovered that the procfs file system implementation in the
Linux kernel did not properly restrict the ability to inspect the kernel
stack of an arbitrary task. A local attacker could use this to expose
sensitive information. (CVE-2018-17972)
Jann Horn discovered that the mremap() system call in the Linux kernel did
not properly flush the TLB when completing, potentially leaving access to a
physical page after it has been released to the page allocator. A local
attacker could use this to cause a denial of service (system crash), expose
sensitive information, or possibly execute arbitrary code. (CVE-2018-18281)
Wei Wu discovered that the KVM implementation in the Linux kernel did not
properly ensure that ioapics were initialized. A local attacker could use
this to cause a denial of service (system crash). (CVE-2018-19407)
It was discovered that the debug interface for the Linux kernel's HID
subsystem did not properly perform bounds checking in some situations. An
attacker with access to debugfs could use this to cause a denial of service
or possibly gain additional privileges. (CVE-2018-9516)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 16.04 LTS:
linux-image-4.15.0-1027-gcp 4.15.0-1027.28~16.04.1
linux-image-4.15.0-1032-aws 4.15.0-1032.34~16.04.1
linux-image-4.15.0-45-generic 4.15.0-45.48~16.04.1
linux-image-4.15.0-45-generic-lpae 4.15.0-45.48~16.04.1
linux-image-4.15.0-45-lowlatency 4.15.0-45.48~16.04.1
linux-image-aws-hwe 4.15.0.1032.33
linux-image-gcp 4.15.0.1027.41
linux-image-generic-hwe-16.04 4.15.0.45.66
linux-image-generic-lpae-hwe-16.04 4.15.0.45.66
linux-image-gke 4.15.0.1027.41
linux-image-lowlatency-hwe-16.04 4.15.0.45.66
linux-image-oem 4.15.0.45.66
linux-image-virtual-hwe-16.04 4.15.0.45.66
After a standard system update you need to reboot your computer to make
all the necessary changes.
ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
linux-powerpc), a standard system upgrade will automatically perform
this as well.
References:
https://usn.ubuntu.com/usn/usn-3871-4
https://usn.ubuntu.com/usn/usn-3871-1
CVE-2018-10876, CVE-2018-10877, CVE-2018-10878, CVE-2018-10879,
CVE-2018-10880, CVE-2018-10882, CVE-2018-10883, CVE-2018-14625,
CVE-2018-16882, CVE-2018-17972, CVE-2018-18281, CVE-2018-19407,
CVE-2018-9516
Package Information:
https://launchpad.net/ubuntu/+source/linux-aws-hwe/4.15.0-1032.34~16.04.1
https://launchpad.net/ubuntu/+source/linux-gcp/4.15.0-1027.28~16.04.1
https://launchpad.net/ubuntu/+source/linux-hwe/4.15.0-45.48~16.04.1
- -------------------------------------------------------------------------------
USN-3871-5: Linux kernel (Azure) vulnerabilities
7 February 2019
linux-azure vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
Ubuntu 18.04 LTS
Ubuntu 16.04 LTS
Ubuntu 14.04 LTS
Summary
Several security issues were fixed in the Linux kernel.
Software Description
linux-azure - Linux kernel for Microsoft Azure Cloud systems
Details
Wen Xu discovered that a use-after-free vulnerability existed in the ext4
filesystem implementation in the Linux kernel. An attacker could use this to
construct a malicious ext4 image that, when mounted, could cause a denial of
service (system crash) or possibly execute arbitrary code. (CVE-2018-10876,
CVE-2018-10879)
Wen Xu discovered that a buffer overflow existed in the ext4 filesystem
implementation in the Linux kernel. An attacker could use this to construct a
malicious ext4 image that, when mounted, could cause a denial of service (system
crash) or possibly execute arbitrary code. (CVE-2018-10877)
Wen Xu discovered that an out-of-bounds write vulnerability existed in the ext4
filesystem implementation in the Linux kernel. An attacker could use this to
construct a malicious ext4 image that, when mounted, could cause a denial of
service (system crash) or possibly execute arbitrary code. (CVE-2018-10878,
CVE-2018-10882)
Wen Xu discovered that the ext4 filesystem implementation in the Linux kernel
did not properly ensure that xattr information remained in inode bodies. An
attacker could use this to construct a malicious ext4 image that, when mounted,
could cause a denial of service (system crash). (CVE-2018-10880)
Wen Xu discovered that the ext4 file system implementation in the Linux kernel
could possibly perform an out of bounds write when updating the journal for an
inline file. An attacker could use this to construct a malicious ext4 image
that, when mounted, could cause a denial of service (system crash).
(CVE-2018-10883)
It was discovered that a race condition existed in the vsock address family
implementation of the Linux kernel that could lead to a use-after-free
condition. A local attacker in a guest virtual machine could use this to expose
sensitive information (host machine kernel memory). (CVE-2018-14625)
Cfir Cohen discovered that a use-after-free vulnerability existed in the KVM
implementation of the Linux kernel, when handling interrupts in environments
where nested virtualization is in use (nested KVM virtualization is not enabled
by default in Ubuntu kernels). A local attacker in a guest VM could possibly use
this to gain administrative privileges in a host machine. (CVE-2018-16882)
Jann Horn discovered that the procfs file system implementation in the Linux
kernel did not properly restrict the ability to inspect the kernel stack of an
arbitrary task. A local attacker could use this to expose sensitive information.
(CVE-2018-17972)
Jann Horn discovered that the mremap() system call in the Linux kernel did not
properly flush the TLB when completing, potentially leaving access to a physical
page after it has been released to the page allocator. A local attacker could
use this to cause a denial of service (system crash), expose sensitive
information, or possibly execute arbitrary code. (CVE-2018-18281)
Wei Wu discovered that the KVM implementation in the Linux kernel did not
properly ensure that ioapics were initialized. A local attacker could use this
to cause a denial of service (system crash). (CVE-2018-19407)
It was discovered that the debug interface for the Linux kernel's HID subsystem
did not properly perform bounds checking in some situations. An attacker with
access to debugfs could use this to cause a denial of service or possibly gain
additional privileges. (CVE-2018-9516)
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 18.04 LTS
linux-image-4.15.0-1037-azure - 4.15.0-1037.39
linux-image-azure - 4.15.0.1037.37
Ubuntu 16.04 LTS
linux-image-4.15.0-1037-azure - 4.15.0-1037.39~16.04.1
linux-image-azure - 4.15.0.1037.42
Ubuntu 14.04 LTS
linux-image-4.15.0-1037-azure - 4.15.0-1037.39~14.04.2
linux-image-azure - 4.15.0.1037.24
To update your system, please follow these instructions:
https://wiki.ubuntu.com/Security/Upgrades.
After a standard system update you need to reboot your computer to make all the
necessary changes.
ATTENTION: Due to an unavoidable ABI change the kernel updates have been given a
new version number, which requires you to recompile and reinstall all third
party kernel modules you might have installed. Unless you manually uninstalled
the standard kernel metapackages (e.g. linux-generic, linux-generic-lts-RELEASE,
linux-virtual, linux-powerpc), a standard system upgrade will automatically
perform this as well.
References
USN-3871-1
CVE-2018-10876
CVE-2018-10877
CVE-2018-10878
CVE-2018-10879
CVE-2018-10880
CVE-2018-10882
CVE-2018-10883
CVE-2018-14625
CVE-2018-16882
CVE-2018-17972
CVE-2018-18281
CVE-2018-19407
CVE-2018-9516
- --------------------------END INCLUDED TEXT--------------------
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