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AUSCERT External Security Bulletin Redistribution
ESB-2021.0981
USN-4883-1: Linux kernel vulnerabilities
22 March 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Linux kernel
Linux kernel (OEM)
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Increased Privileges -- Existing Account
Denial of Service -- Existing Account
Access Confidential Data -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-27365 CVE-2021-27364 CVE-2021-27363
CVE-2021-20194 CVE-2021-3348 CVE-2021-3347
Reference: ESB-2021.0920
ESB-2021.0837
Original Bulletin:
https://ubuntu.com/security/notices/USN-4883-1
https://ubuntu.com/security/notices/USN-4884-1
Comment: This bulletin contains two (2) Ubuntu security advisories.
- --------------------------BEGIN INCLUDED TEXT--------------------
USN-4883-1: Linux kernel vulnerabilities
20 March 2021
Several security issues were fixed in the Linux kernel.
Releases
o Ubuntu 18.04 LTS
o Ubuntu 16.04 LTS
o Ubuntu 14.04 ESM
Packages
o linux - Linux kernel
o linux-aws - Linux kernel for Amazon Web Services (AWS) systems
o linux-aws-hwe - Linux kernel for Amazon Web Services (AWS-HWE) systems
o linux-azure - Linux kernel for Microsoft Azure Cloud systems
o linux-azure-4.15 - Linux kernel for Microsoft Azure Cloud systems
o linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
o linux-gcp-4.15 - Linux kernel for Google Cloud Platform (GCP) systems
o linux-hwe - Linux hardware enablement (HWE) kernel
o linux-kvm - Linux kernel for cloud environments
o linux-oracle - Linux kernel for Oracle Cloud systems
o linux-raspi2 - Linux kernel for Raspberry Pi (V8) systems
o linux-snapdragon - Linux kernel for Qualcomm Snapdragon processors
Details
Adam Nichols discovered that heap overflows existed in the iSCSI subsystem
in the Linux kernel. A local attacker could use this to cause a denial of
service (system crash) or possibly execute arbitrary code. ( CVE-2021-27365 )
Adam Nichols discovered that the iSCSI subsystem in the Linux kernel did
not properly restrict access to iSCSI transport handles. A local attacker
could use this to cause a denial of service or expose sensitive information
(kernel pointer addresses). ( CVE-2021-27363 )
Adam Nichols discovered that an out-of-bounds read existed in the iSCSI
subsystem in the Linux kernel. A local attacker could use this to cause a
denial of service (system crash) or expose sensitive information (kernel
memory). ( CVE-2021-27364 )
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 18.04
o linux-image-4.15.0-1081-raspi2 - 4.15.0-1081.86
o linux-image-powerpc-e500mc - 4.15.0.139.126
o linux-image-4.15.0-1096-aws - 4.15.0-1096.103
o linux-image-4.15.0-139-lowlatency - 4.15.0-139.143
o linux-image-gcp-lts-18.04 - 4.15.0.1095.113
o linux-image-4.15.0-1087-kvm - 4.15.0-1087.89
o linux-image-oracle-lts-18.04 - 4.15.0.1067.77
o linux-image-4.15.0-1095-gcp - 4.15.0-1095.108
o linux-image-virtual - 4.15.0.139.126
o linux-image-4.15.0-139-generic-lpae - 4.15.0-139.143
o linux-image-snapdragon - 4.15.0.1098.101
o linux-image-powerpc64-emb - 4.15.0.139.126
o linux-image-4.15.0-1067-oracle - 4.15.0-1067.75
o linux-image-aws-lts-18.04 - 4.15.0.1096.99
o linux-image-4.15.0-1110-azure - 4.15.0-1110.122
o linux-image-generic - 4.15.0.139.126
o linux-image-4.15.0-1098-snapdragon - 4.15.0-1098.107
o linux-image-kvm - 4.15.0.1087.83
o linux-image-raspi2 - 4.15.0.1081.78
o linux-image-azure-lts-18.04 - 4.15.0.1110.83
o linux-image-powerpc-smp - 4.15.0.139.126
o linux-image-generic-lpae - 4.15.0.139.126
o linux-image-4.15.0-139-generic - 4.15.0-139.143
o linux-image-powerpc64-smp - 4.15.0.139.126
o linux-image-lowlatency - 4.15.0.139.126
Ubuntu 16.04
o linux-image-powerpc-e500mc - 4.4.0.206.212
o linux-image-4.4.0-206-powerpc-smp - 4.4.0-206.238
o linux-image-4.4.0-206-powerpc-e500mc - 4.4.0-206.238
o linux-image-4.15.0-1096-aws - 4.15.0-1096.103~16.04.1
o linux-image-generic-hwe-16.04 - 4.15.0.139.134
o linux-image-4.15.0-139-lowlatency - 4.15.0-139.143~16.04.1
o linux-image-virtual-hwe-16.04 - 4.15.0.139.134
o linux-image-oracle - 4.15.0.1067.55
o linux-image-azure - 4.15.0.1110.101
o linux-image-generic-lpae-hwe-16.04 - 4.15.0.139.134
o linux-image-4.4.0-1090-kvm - 4.4.0-1090.99
o linux-image-4.15.0-1095-gcp - 4.15.0-1095.108~16.04.1
o linux-image-virtual - 4.4.0.206.212
o linux-image-4.15.0-139-generic-lpae - 4.15.0-139.143~16.04.1
o linux-image-4.4.0-206-generic-lpae - 4.4.0-206.238
o linux-image-snapdragon - 4.4.0.1152.144
o linux-image-powerpc64-smp - 4.4.0.206.212
o linux-image-4.15.0-139-generic - 4.15.0-139.143~16.04.1
o linux-image-4.4.0-206-lowlatency - 4.4.0-206.238
o linux-image-gke - 4.15.0.1095.96
o linux-image-4.4.0-206-powerpc64-smp - 4.4.0-206.238
o linux-image-azure-edge - 4.15.0.1110.101
o linux-image-4.15.0-1110-azure - 4.15.0-1110.122~16.04.1
o linux-image-generic - 4.4.0.206.212
o linux-image-4.4.0-1124-aws - 4.4.0-1124.138
o linux-image-oem - 4.15.0.139.134
o linux-image-aws - 4.4.0.1124.129
o linux-image-kvm - 4.4.0.1090.88
o linux-image-powerpc-smp - 4.4.0.206.212
o linux-image-generic-lpae - 4.4.0.206.212
o linux-image-4.4.0-206-powerpc64-emb - 4.4.0-206.238
o linux-image-gcp - 4.15.0.1095.96
o linux-image-lowlatency-hwe-16.04 - 4.15.0.139.134
o linux-image-4.4.0-1152-snapdragon - 4.4.0-1152.162
o linux-image-powerpc64-emb - 4.4.0.206.212
o linux-image-4.4.0-206-generic - 4.4.0-206.238
o linux-image-4.15.0-1067-oracle - 4.15.0-1067.75~16.04.1
o linux-image-lowlatency - 4.4.0.206.212
o linux-image-aws-hwe - 4.15.0.1096.89
Ubuntu 14.04
o linux-image-4.15.0-1110-azure - 4.15.0-1110.122~14.04.1
o linux-image-aws - 4.4.0.1088.85
o linux-image-4.4.0-1088-aws - 4.4.0-1088.92
o linux-image-azure - 4.15.0.1110.83
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
o CVE-2021-27365
o CVE-2021-27363
o CVE-2021-27364
- --------------------------------------------------------------------------------
USN-4884-1: Linux kernel (OEM) vulnerabilities
20 March 2021
Several security issues were fixed in the Linux kernel.
Releases
o Ubuntu 20.04 LTS
Packages
o linux-oem-5.10 - Linux kernel for OEM systems
Details
Loris Reiff discovered that the BPF implementation in the Linux kernel did
not properly validate attributes in the getsockopt BPF hook. A local
attacker could possibly use this to cause a denial of service (system
crash). ( CVE-2021-20194 )
It was discovered that the priority inheritance futex implementation in the
Linux kernel contained a race condition, leading to a use-after-free
vulnerability. A local attacker could use this to cause a denial of service
(system crash) or possibly execute arbitrary code. ( CVE-2021-3347 )
It was discovered that the network block device (nbd) driver in the Linux
kernel contained a use-after-free vulnerability during device setup. A
local attacker with access to the nbd device could use this to cause a
denial of service (system crash) or possibly execute arbitrary code.
( CVE-2021-3348 )
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 20.04
o linux-image-oem-20.04b - 5.10.0.1017.18
o linux-image-5.10.0-1017-oem - 5.10.0-1017.18
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
o CVE-2021-3348
o CVE-2021-20194
o CVE-2021-3347
Related notices
o USN-4878-1 : linux-image-gke-5.4, linux-image-5.4.0-1038-gcp,
linux-image-5.4.0-67-lowlatency, linux-image-oem, linux-azure-5.4,
linux-hwe-5.4, linux, linux-image-gcp, linux-gke-5.4, linux-oracle-5.4,
linux-image-raspi2, linux-image-raspi-hwe-18.04, linux-image-oracle,
linux-image-snapdragon-hwe-18.04, linux-raspi, linux-image-5.4.0-1039-aws,
linux-image-5.4.0-67-generic, linux-gcp-5.4, linux-gkeop,
linux-image-generic-hwe-18.04, linux-image-5.4.0-1041-azure,
linux-image-gkeop-5.4, linux-image-5.4.0-67-generic-lpae,
linux-image-raspi, linux-image-gkeop, linux-gcp, linux-gkeop-5.4,
linux-image-virtual-hwe-18.04, linux-image-lowlatency-hwe-18.04, linux-aws,
linux-image-generic-lpae-hwe-18.04, linux-image-5.4.0-1034-kvm,
linux-image-5.4.0-1011-gkeop, linux-image-oem-osp1,
linux-image-5.4.0-1037-gke, linux-image-aws, linux-image-aws-edge,
linux-image-generic-lpae, linux-oracle, linux-image-azure, linux-kvm,
linux-image-virtual, linux-image-5.4.0-1030-raspi,
linux-image-5.4.0-1039-oracle, linux-image-kvm, linux-raspi-5.4,
linux-image-gcp-edge, linux-image-lowlatency, linux-image-generic,
linux-azure, linux-image-azure-edge, linux-aws-5.4
o USN-4879-1 : linux-image-gke, linux-image-generic-lpae-hwe-20.04,
linux-image-5.8.0-1024-azure, linux-image-5.8.0-45-generic-lpae,
linux-image-5.8.0-45-generic-64k, linux, linux-image-gcp,
linux-image-5.8.0-1025-aws, linux-image-lowlatency-hwe-20.04,
linux-image-generic-64k, linux-hwe-5.8, linux-image-oracle, linux-raspi,
linux-image-5.8.0-1020-kvm, linux-image-raspi,
linux-image-generic-64k-hwe-20.04, linux-image-generic-hwe-20.04,
linux-gcp, linux-image-5.8.0-1017-raspi-nolpae,
linux-image-5.8.0-1022-oracle, linux-aws, linux-image-5.8.0-45-generic,
linux-image-aws, linux-image-generic-lpae, linux-oracle, linux-image-azure,
linux-kvm, linux-image-virtual-hwe-20.04, linux-image-oem-20.04,
linux-image-virtual, linux-image-5.8.0-1024-gcp,
linux-image-5.8.0-1017-raspi, linux-image-kvm, linux-image-raspi-nolpae,
linux-image-lowlatency, linux-image-generic,
linux-image-5.8.0-45-lowlatency, linux-azure
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