1. Ubuntu Security Notices
  2. USN-6051-1

USN-6051-1: Linux kernel vulnerabilities

Publication date

1 May 2023

Overview

Several security issues were fixed in the Linux kernel.

Releases

Packages

Details

It was discovered that the Traffic-Control Index (TCINDEX) implementation
in the Linux kernel did not properly perform filter deactivation in some
situations. A local attacker could possibly use this to gain elevated
privileges. Please note that with the fix for this CVE, kernel support for
the TCINDEX classifier has been removed. (CVE-2023-1829)

It was discovered that a race condition existed in the io_uring subsystem
in the Linux kernel, 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-2023-1872)

It was discovered that the Traffic-Control Index (TCINDEX) implementation
in the Linux kernel did not properly perform filter deactivation in some
situations. A local attacker could possibly use this to gain elevated
privileges. Please note that with the fix for this CVE, kernel support for
the TCINDEX classifier has been removed. (CVE-2023-1829)

It was discovered that a race condition existed in the io_uring subsystem
in the Linux kernel, 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-2023-1872)

Update instructions

After a standard system update you need to reboot your computer to make all the necessary changes.

Learn more about how to get the fixes.

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.

The problem can be corrected by updating your system to the following package versions:

Ubuntu Release Package Version
22.04 jammy linux-image-5.15.0-1032-kvm –  5.15.0-1032.37
linux-image-5.15.0-1037-azure-fde –  5.15.0-1037.44.1
linux-image-azure-fde –  5.15.0.1037.44.14
linux-image-kvm –  5.15.0.1032.28
20.04 focal linux-image-azure –  5.15.0.1037.44~20.04.27
linux-image-5.15.0-1037-azure –  5.15.0-1037.44~20.04.1
linux-image-azure-cvm –  5.15.0.1037.44~20.04.27

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References

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