[USN-8351-1] Linux kernel (Low Latency) vulnerabilities

[Rodrigo Figueiredo Zaiden]

==========================================================================
Ubuntu Security Notice USN-8351-1
June 01, 2026

linux-lowlatency vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 22.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux-lowlatency: Linux low latency kernel

Details:

It was discovered that the Linux kernel algif_aead module did not properly
handle in-place cryptographic operations. This flaw is known as Copy Fail.
A local attacker could use this to escalate privileges, or possibly escape
a container. (CVE-2026-31431)

Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
   - Cryptographic API;
   - Ethernet bonding driver;
   - Packet sockets;
   - TLS protocol;
(CVE-2026-31419, CVE-2026-31504, CVE-2026-31533, CVE-2026-43033,
CVE-2026-43077, CVE-2026-43078, CVE-2026-46028)

Update instructions:

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

Ubuntu 22.04 LTS
   linux-image-5.15.0-179-lowlatency  5.15.0-179.189
   linux-image-5.15.0-179-lowlatency-64k  5.15.0-179.189
   linux-image-lowlatency          5.15.0.179.151
   linux-image-lowlatency-5.15     5.15.0.179.151
   linux-image-lowlatency-64k      5.15.0.179.151
   linux-image-lowlatency-64k-5.15  5.15.0.179.151
   linux-image-lowlatency-64k-hwe-20.04  5.15.0.179.151
   linux-image-lowlatency-hwe-20.04  5.15.0.179.151

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:
   https://ubuntu.com/security/notices/USN-8351-1
   CVE-2026-31419, CVE-2026-31431, CVE-2026-31504, CVE-2026-31533,
   CVE-2026-43033, CVE-2026-43077, CVE-2026-43078, CVE-2026-46028

Package Information:
   https://launchpad.net/ubuntu/+source/linux-lowlatency/5.15.0-179.189

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