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AUSCERT External Security Bulletin Redistribution
ESB-2017.0575
Important: kernel-rt security and bug fix update
3 March 2017
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: kernel-rt
Publisher: Red Hat
Operating System: Red Hat Enterprise Linux Server 6
Red Hat Enterprise Linux Server 7
Impact/Access: Root Compromise -- Existing Account
Denial of Service -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2016-9084 CVE-2016-9083 CVE-2016-8655
CVE-2016-8630
Reference: ESB-2017.0574
ESB-2017.0456
ESB-2017.0435
ESB-2017.0356
Original Bulletin:
https://rhn.redhat.com/errata/RHSA-2017-0387.html
https://rhn.redhat.com/errata/RHSA-2017-0402.html
Comment: This bulletin contains two (2) Red Hat security advisories.
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Red Hat Security Advisory
Synopsis: Important: kernel-rt security and bug fix update
Advisory ID: RHSA-2017:0387-01
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2017-0387.html
Issue date: 2017-03-02
CVE Names: CVE-2016-8630 CVE-2016-8655 CVE-2016-9083
CVE-2016-9084
=====================================================================
1. Summary:
An update for kernel-rt is now available for Red Hat Enterprise Linux 7.
Red Hat Product Security has rated this update as having a security impact
of Important. A Common Vulnerability Scoring System (CVSS) base score,
which gives a detailed severity rating, is available for each vulnerability
from the CVE link(s) in the References section.
2. Relevant releases/architectures:
Red Hat Enterprise Linux Realtime (v. 7) - noarch, x86_64
Red Hat Enterprise Linux for Real Time for NFV (v. 7) - noarch, x86_64
3. Description:
The kernel-rt packages provide the Real Time Linux Kernel, which enables
fine-tuning for systems with extremely high determinism requirements.
Security Fix(es):
* Linux kernel built with the Kernel-based Virtual Machine (CONFIG_KVM)
support is vulnerable to a null pointer dereference flaw. It could occur on
x86 platform, when emulating an undefined instruction. An attacker could
use this flaw to crash the host kernel resulting in DoS. (CVE-2016-8630,
Important)
* A race condition issue leading to a use-after-free flaw was found in the
way the raw packet sockets implementation in the Linux kernel networking
subsystem handled synchronization while creating the TPACKET_V3 ring
buffer. A local user able to open a raw packet socket (requires the
CAP_NET_RAW capability) could use this flaw to elevate their privileges on
the system. (CVE-2016-8655, Important)
* A flaw was discovered in the Linux kernel's implementation of VFIO. An
attacker issuing an ioctl can create a situation where memory is corrupted
and modify memory outside of the expected area. This may overwrite kernel
memory and subvert kernel execution. (CVE-2016-9083, Important)
* The use of a kzalloc with an integer multiplication allowed an integer
overflow condition to be reached in vfio_pci_intrs.c. This combined with
CVE-2016-9083 may allow an attacker to craft an attack and use unallocated
memory, potentially crashing the machine. (CVE-2016-9084, Moderate)
Red Hat would like to thank Philip Pettersson for reporting CVE-2016-8655.
Bug Fix(es):
* Previously, the asynchronous page fault woke code references spinlocks,
which were actually sleeping locks in the RT kernel. Because of this, when
the code was executed from the exception context, a bug warning appeared on
the console. With this update, the regular wait queue and spinlock code in
this area has been modified to use simple-wait-queue and raw-spinlocks.
This code change enables the asynchronous page fault code to run in a
non-preemptable state without bug warnings. (BZ#1418035)
4. Solution:
For details on how to apply this update, which includes the changes
described in this advisory, refer to:
https://access.redhat.com/articles/11258
The system must be rebooted for this update to take effect.
5. Bugs fixed (https://bugzilla.redhat.com/):
1389258 - CVE-2016-9083 kernel: State machine confusion bug in vfio driver leading to memory corruption
1389259 - CVE-2016-9084 kernel: Integer overflow when using kzalloc in vfio driver
1393350 - CVE-2016-8630 kernel: kvm: x86: NULL pointer dereference during instruction decode
1400019 - CVE-2016-8655 kernel: Race condition in packet_set_ring leads to use after free
1415172 - kernel-rt: update to the RHEL7.3.z batch#3 source tree [rt-7.3.z]
6. Package List:
Red Hat Enterprise Linux for Real Time for NFV (v. 7):
Source:
kernel-rt-3.10.0-514.10.2.rt56.435.el7.src.rpm
noarch:
kernel-rt-doc-3.10.0-514.10.2.rt56.435.el7.noarch.rpm
x86_64:
kernel-rt-3.10.0-514.10.2.rt56.435.el7.x86_64.rpm
kernel-rt-debug-3.10.0-514.10.2.rt56.435.el7.x86_64.rpm
kernel-rt-debug-debuginfo-3.10.0-514.10.2.rt56.435.el7.x86_64.rpm
kernel-rt-debug-devel-3.10.0-514.10.2.rt56.435.el7.x86_64.rpm
kernel-rt-debug-kvm-3.10.0-514.10.2.rt56.435.el7.x86_64.rpm
kernel-rt-debug-kvm-debuginfo-3.10.0-514.10.2.rt56.435.el7.x86_64.rpm
kernel-rt-debuginfo-3.10.0-514.10.2.rt56.435.el7.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-3.10.0-514.10.2.rt56.435.el7.x86_64.rpm
kernel-rt-devel-3.10.0-514.10.2.rt56.435.el7.x86_64.rpm
kernel-rt-kvm-3.10.0-514.10.2.rt56.435.el7.x86_64.rpm
kernel-rt-kvm-debuginfo-3.10.0-514.10.2.rt56.435.el7.x86_64.rpm
kernel-rt-trace-3.10.0-514.10.2.rt56.435.el7.x86_64.rpm
kernel-rt-trace-debuginfo-3.10.0-514.10.2.rt56.435.el7.x86_64.rpm
kernel-rt-trace-devel-3.10.0-514.10.2.rt56.435.el7.x86_64.rpm
kernel-rt-trace-kvm-3.10.0-514.10.2.rt56.435.el7.x86_64.rpm
kernel-rt-trace-kvm-debuginfo-3.10.0-514.10.2.rt56.435.el7.x86_64.rpm
Red Hat Enterprise Linux Realtime (v. 7):
Source:
kernel-rt-3.10.0-514.10.2.rt56.435.el7.src.rpm
noarch:
kernel-rt-doc-3.10.0-514.10.2.rt56.435.el7.noarch.rpm
x86_64:
kernel-rt-3.10.0-514.10.2.rt56.435.el7.x86_64.rpm
kernel-rt-debug-3.10.0-514.10.2.rt56.435.el7.x86_64.rpm
kernel-rt-debug-debuginfo-3.10.0-514.10.2.rt56.435.el7.x86_64.rpm
kernel-rt-debug-devel-3.10.0-514.10.2.rt56.435.el7.x86_64.rpm
kernel-rt-debuginfo-3.10.0-514.10.2.rt56.435.el7.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-3.10.0-514.10.2.rt56.435.el7.x86_64.rpm
kernel-rt-devel-3.10.0-514.10.2.rt56.435.el7.x86_64.rpm
kernel-rt-trace-3.10.0-514.10.2.rt56.435.el7.x86_64.rpm
kernel-rt-trace-debuginfo-3.10.0-514.10.2.rt56.435.el7.x86_64.rpm
kernel-rt-trace-devel-3.10.0-514.10.2.rt56.435.el7.x86_64.rpm
These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/
7. References:
https://access.redhat.com/security/cve/CVE-2016-8630
https://access.redhat.com/security/cve/CVE-2016-8655
https://access.redhat.com/security/cve/CVE-2016-9083
https://access.redhat.com/security/cve/CVE-2016-9084
https://access.redhat.com/security/updates/classification/#important
8. Contact:
The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/
Copyright 2017 Red Hat, Inc.
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Red Hat Security Advisory
Synopsis: Important: kernel-rt security, bug fix, and enhancement update
Advisory ID: RHSA-2017:0402-01
Product: Red Hat Enterprise MRG for RHEL-6
Advisory URL: https://rhn.redhat.com/errata/RHSA-2017-0402.html
Issue date: 2017-03-02
CVE Names: CVE-2016-8655
=====================================================================
1. Summary:
An update for kernel-rt is now available for Red Hat Enterprise MRG 2.
Red Hat Product Security has rated this update as having a security impact
of Important. A Common Vulnerability Scoring System (CVSS) base score,
which gives a detailed severity rating, is available for each vulnerability
from the CVE link(s) in the References section.
2. Relevant releases/architectures:
MRG Realtime for RHEL 6 Server v.2 - noarch, x86_64
3. Description:
The kernel-rt packages provide the Real Time Linux Kernel, which enables
fine-tuning for systems with extremely high determinism requirements.
Security Fix(es):
* A race condition issue leading to a use-after-free flaw was found in the
way the raw packet sockets implementation in the Linux kernel networking
subsystem handled synchronization while creating the TPACKET_V3 ring
buffer. A local user able to open a raw packet socket (requires the
CAP_NET_RAW capability) could use this flaw to elevate their privileges on
the system. (CVE-2016-8655, Important)
Red Hat would like to thank Philip Pettersson for reporting this issue.
Enhancement(s):
* Previously, the Broadcom bnx2x driver in the MRG kernel-rt used an
incorrect PTP Hardware Clock (PHC) timer divisor value, which broke
Precision Time Protocol (PTP) timestamping due to an unstable clock. This
update corrects the divisor value, and the PTP timestamping is now
accurate, with monotonically increasing timestamp values. (BZ#1411139)
4. Solution:
For details on how to apply this update, which includes the changes
described in this advisory, refer to:
https://access.redhat.com/articles/11258
The system must be rebooted for this update to take effect.
5. Bugs fixed (https://bugzilla.redhat.com/):
1400019 - CVE-2016-8655 kernel: Race condition in packet_set_ring leads to use after free
1414055 - update the MRG 2.5.z 3.10 kernel-rt sources
6. Package List:
MRG Realtime for RHEL 6 Server v.2:
Source:
kernel-rt-3.10.0-514.rt56.215.el6rt.src.rpm
noarch:
kernel-rt-doc-3.10.0-514.rt56.215.el6rt.noarch.rpm
kernel-rt-firmware-3.10.0-514.rt56.215.el6rt.noarch.rpm
x86_64:
kernel-rt-3.10.0-514.rt56.215.el6rt.x86_64.rpm
kernel-rt-debug-3.10.0-514.rt56.215.el6rt.x86_64.rpm
kernel-rt-debug-debuginfo-3.10.0-514.rt56.215.el6rt.x86_64.rpm
kernel-rt-debug-devel-3.10.0-514.rt56.215.el6rt.x86_64.rpm
kernel-rt-debuginfo-3.10.0-514.rt56.215.el6rt.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-3.10.0-514.rt56.215.el6rt.x86_64.rpm
kernel-rt-devel-3.10.0-514.rt56.215.el6rt.x86_64.rpm
kernel-rt-trace-3.10.0-514.rt56.215.el6rt.x86_64.rpm
kernel-rt-trace-debuginfo-3.10.0-514.rt56.215.el6rt.x86_64.rpm
kernel-rt-trace-devel-3.10.0-514.rt56.215.el6rt.x86_64.rpm
kernel-rt-vanilla-3.10.0-514.rt56.215.el6rt.x86_64.rpm
kernel-rt-vanilla-debuginfo-3.10.0-514.rt56.215.el6rt.x86_64.rpm
kernel-rt-vanilla-devel-3.10.0-514.rt56.215.el6rt.x86_64.rpm
These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/
7. References:
https://access.redhat.com/security/cve/CVE-2016-8655
https://access.redhat.com/security/updates/classification/#important
8. Contact:
The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/
Copyright 2017 Red Hat, Inc.
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