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h1. USN-4883-1: Linux kernel vulnerabilities
20 March 2021
Several security issues were fixed in the Linux kernel.
h2. Releases
- [Ubuntu 18.04 LTS|https://ubuntu.com/security/notices?release=bionic]
- [Ubuntu 16.04 LTS|https://ubuntu.com/security/notices?release=xenial]
- [Ubuntu 14.04 ESM|https://ubuntu.com/security/notices?release=trusty]
h2. Packages
- [linux|/security/cve?package=linux]
-
- [linux-aws|/security/cve?package=linux-aws]
-
- Linux kernel for Amazon Web Services (AWS) systems
- [linux-aws-hwe|/security/cve?package=linux-aws-hwe]
-
- Linux kernel for Amazon Web Services (AWS-HWE) systems
- [linux-azure|/security/cve?package=linux-azure]
-
- Linux kernel for Microsoft Azure Cloud systems
- [linux-azure-4.15|/security/cve?package=linux-azure-4.15]
-
- Linux kernel for Microsoft Azure Cloud systems
- [linux-gcp|/security/cve?package=linux-gcp]
-
- Linux kernel for Google Cloud Platform (GCP) systems
- [linux-gcp-4.15|/security/cve?package=linux-gcp-4.15]
-
- Linux kernel for Google Cloud Platform (GCP) systems
- [linux-hwe|/security/cve?package=linux-hwe]
-
- Linux hardware enablement (HWE) kernel
- [linux-kvm|/security/cve?package=linux-kvm]
-
- Linux kernel for cloud environments
h2. 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|/security/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|/security/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|/security/CVE-2021-27364]
h2. Update instructions
The problem can be corrected by updating your system to the following package versions:
h5. Ubuntu 18.04
- [linux-image-4.15.0-1081-raspi2|https://launchpad.net/ubuntu/+source/linux-raspi2]
- [4.15.0-1081.86|https://launchpad.net/ubuntu/+source/linux-raspi2/4.15.0-1081.86]
- linux-image-powerpc-e500mc-4.15.0.139.126
- [linux-image-4.15.0-1096-aws|https://launchpad.net/ubuntu/+source/linux-aws]
- [4.15.0-1096.103|https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1096.103]
- [linux-image-4.15.0-139-lowlatency|https://launchpad.net/ubuntu/+source/linux]
- [4.15.0-139.143|https://launchpad.net/ubuntu/+source/linux/4.15.0-139.143]
- linux-image-gcp-lts-18.04-4.15.0.1095.113
- [linux-image-4.15.0-1087-kvm|https://launchpad.net/ubuntu/+source/linux-kvm]
- [4.15.0-1087.89|https://launchpad.net/ubuntu/+source/linux-kvm/4.15.0-1087.89]
- linux-image-oracle-lts-18.04-4.15.0.1067.77
- [linux-image-4.15.0-1095-gcp|https://launchpad.net/ubuntu/+source/linux-gcp-4.15]
- [4.15.0-1095.108|https://launchpad.net/ubuntu/+source/linux-gcp-4.15/4.15.0-1095.108]
- linux-image-virtual-4.15.0.139.126
- [linux-image-4.15.0-139-generic-lpae|https://launchpad.net/ubuntu/+source/linux]
- [4.15.0-139.143|https://launchpad.net/ubuntu/+source/linux/4.15.0-139.143]
- linux-image-snapdragon-4.15.0.1098.101
- linux-image-powerpc64-emb-4.15.0.139.126
- [linux-image-4.15.0-1067-oracle|https://launchpad.net/ubuntu/+source/linux-oracle]
- [4.15.0-1067.75|https://launchpad.net/ubuntu/+source/linux-oracle/4.15.0-1067.75]
- linux-image-aws-lts-18.04-4.15.0.1096.99
- [linux-image-4.15.0-1110-azure|https://launchpad.net/ubuntu/+source/linux-azure-4.15]
- [4.15.0-1110.122|https://launchpad.net/ubuntu/+source/linux-azure-4.15/4.15.0-1110.122]
h5. Ubuntu 16.04
linux-image-powerpc-e500mc-4.4.0.206.212
[linux-image-4.4.0-206-powerpc-smp|https://launchpad.net/ubuntu/+source/linux]
[4.4.0-206.238|https://launchpad.net/ubuntu/+source/linux/4.4.0-206.238]
[linux-image-4.4.0-206-powerpc-e500mc|https://launchpad.net/ubuntu/+source/linux]
[4.4.0-206.238|https://launchpad.net/ubuntu/+source/linux/4.4.0-206.238]
[linux-image-4.15.0-1096-aws|https://launchpad.net/ubuntu/+source/linux-aws-hwe]
[4.15.0-1096.103~16.04.1|https://launchpad.net/ubuntu/+source/linux-aws-hwe/4.15.0-1096.103~16.04.1]
linux-image-generic-hwe-16.04-4.15.0.139.134
[linux-image-4.15.0-139-lowlatency|https://launchpad.net/ubuntu/+source/linux-hwe]
[4.15.0-139.143~16.04.1|https://launchpad.net/ubuntu/+source/linux-hwe/4.15.0-139.143~16.04.1]
linux-image-virtual-hwe-16.04-4.15.0.139.134
linux-image-virtual-4.4.0.206.212
[linux-image-4.15.0-139-generic-lpae|https://launchpad.net/ubuntu/+source/linux-hwe]
[4.15.0-139.143~16.04.1|https://launchpad.net/ubuntu/+source/linux-hwe/4.15.0-139.143~16.04.1]
[linux-image-4.4.0-206-generic-lpae|https://launchpad.net/ubuntu/+source/linux]
[4.4.0-206.238|https://launchpad.net/ubuntu/+source/linux/4.4.0-206.238]
linux-image-snapdragon-4.4.0.1152.144
linux-image-powerpc64-smp-4.4.0.206.212
[linux-image-4.15.0-139-generic|https://launchpad.net/ubuntu/+source/linux-hwe]
[4.15.0-139.143~16.04.1|https://launchpad.net/ubuntu/+source/linux-hwe/4.15.0-139.143~16.04.1]
[linux-image-4.4.0-206-lowlatency|https://launchpad.net/ubuntu/+source/linux]
[4.4.0-206.238|https://launchpad.net/ubuntu/+source/linux/4.4.0-206.238]
linux-image-gke-4.15.0.1095.96
[linux-image-4.4.0-206-powerpc64-smp|https://launchpad.net/ubuntu/+source/linux]
[4.4.0-206.238|https://launchpad.net/ubuntu/+source/linux/4.4.0-206.238]
linux-image-azure-edge-4.15.0.1110.101
[linux-image-4.15.0-1110-azure|https://launchpad.net/ubuntu/+source/linux-azure]
[4.15.0-1110.122~16.04.1|https://launchpad.net/ubuntu/+source/linux-azure/4.15.0-1110.122~16.04.1]
linux-image-generic-4.4.0.206.212
[linux-image-4.4.0-1124-aws|https://launchpad.net/ubuntu/+source/linux-aws]
[4.4.0-1124.138|https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1124.138]
linux-image-oem-4.15.0.139.134
linux-image-aws-4.4.0.1124.129
linux-image-kvm-4.4.0.1090.88
linux-image-powerpc-smp-4.4.0.206.212
linux-image-generic-lpae-4.4.0.206.212
[linux-image-4.4.0-206-powerpc64-emb|https://launchpad.net/ubuntu/+source/linux]
[4.4.0-206.238|https://launchpad.net/ubuntu/+source/linux/4.4.0-206.238]
linux-image-gcp-4.15.0.1095.96
linux-image-lowlatency-hwe-16.04-4.15.0.139.134
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.
h2. References
- [CVE-2021-27365|https://people.canonical.com/~ubuntu-security/cve/CVE-2021-27365]
- [CVE-2021-27363|https://people.canonical.com/~ubuntu-security/cve/CVE-2021-27363]
- [CVE-2021-27364|https://people.canonical.com/~ubuntu-security/cve/CVE-2021-27364]