1. Ubuntu Security Notices
  2. USN-6044-1

USN-6044-1: Linux kernel vulnerabilities

Publication date

26 April 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-virtual –  5.15.0.71.69
linux-image-5.15.0-1037-azure –  5.15.0-1037.44
linux-image-generic-64k –  5.15.0.71.69
linux-image-generic –  5.15.0.71.69
linux-image-gke-5.15 –  5.15.0.1032.31
linux-image-5.15.0-1032-gke –  5.15.0-1032.37
linux-image-ibm –  5.15.0.1029.25
linux-image-5.15.0-1034-oracle –  5.15.0-1034.40
linux-image-5.15.0-1035-aws –  5.15.0-1035.39
linux-image-5.15.0-71-generic –  5.15.0-71.78
linux-image-5.15.0-71-lowlatency –  5.15.0-71.78
linux-image-5.15.0-71-lowlatency-64k –  5.15.0-71.78
linux-image-oracle –  5.15.0.1034.29
linux-image-azure-lts-22.04 –  5.15.0.1037.33
linux-image-gkeop –  5.15.0.1019.18
linux-image-azure –  5.15.0.1037.33
linux-image-5.15.0-71-generic-64k –  5.15.0-71.78
linux-image-aws-lts-22.04 –  5.15.0.1035.34
linux-image-gke –  5.15.0.1032.31
linux-image-generic-lpae –  5.15.0.71.69
linux-image-lowlatency-64k –  5.15.0.71.76
linux-image-gkeop-5.15 –  5.15.0.1019.18
linux-image-5.15.0-1029-ibm –  5.15.0-1029.32
linux-image-5.15.0-1019-gkeop –  5.15.0-1019.24
linux-image-lowlatency –  5.15.0.71.76
linux-image-5.15.0-71-generic-lpae –  5.15.0-71.78
20.04 focal linux-image-virtual-hwe-20.04 –  5.15.0.71.78~20.04.32
linux-image-aws –  5.15.0.1035.39~20.04.24
linux-image-gke-5.15 –  5.15.0.1032.37~20.04.1
linux-image-lowlatency-hwe-20.04 –  5.15.0.71.78~20.04.29
linux-image-5.15.0-1032-gke –  5.15.0-1032.37~20.04.1
linux-image-5.15.0-1034-oracle –  5.15.0-1034.40~20.04.1
linux-image-5.15.0-1035-aws –  5.15.0-1035.39~20.04.1
linux-image-5.15.0-71-generic –  5.15.0-71.78~20.04.1
linux-image-5.15.0-71-lowlatency –  5.15.0-71.78~20.04.1
linux-image-5.15.0-71-lowlatency-64k –  5.15.0-71.78~20.04.1
linux-image-oracle –  5.15.0.1034.40~20.04.1
linux-image-oem-20.04c –  5.15.0.71.78~20.04.32
linux-image-oem-20.04b –  5.15.0.71.78~20.04.32
linux-image-oem-20.04d –  5.15.0.71.78~20.04.32
linux-image-generic-hwe-20.04 –  5.15.0.71.78~20.04.32
linux-image-5.15.0-71-generic-64k –  5.15.0-71.78~20.04.1
linux-image-oem-20.04 –  5.15.0.71.78~20.04.32
linux-image-lowlatency-64k-hwe-20.04 –  5.15.0.71.78~20.04.29
linux-image-generic-lpae-hwe-20.04 –  5.15.0.71.78~20.04.32
linux-image-generic-64k-hwe-20.04 –  5.15.0.71.78~20.04.32
linux-image-5.15.0-71-generic-lpae –  5.15.0-71.78~20.04.1

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References

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