Ubuntu alert USN-8305-2 (linux-lowlatency-hwe-5.15)

From:
             
 
Rodrigo Figueiredo Zaiden <rodrigo.zaiden@canonical.com>
To:
             
 
ubuntu-security-announce@lists.ubuntu.com
Subject:
             
 
[USN-8305-2] Linux kernel (Low Latency) vulnerabilities
Date:
             
 
Tue, 26 May 2026 17:04:12 -0300
Message-ID:
             
 
<0d0472fe-e17a-4e43-b376-389b6003ba8c@canonical.com>
==========================================================================
Ubuntu Security Notice USN-8305-2
May 26, 2026

linux-lowlatency-hwe-5.15 vulnerabilities
==========================================================================

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

- Ubuntu 20.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux-lowlatency-hwe-5.15: 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)

Update instructions:

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

Ubuntu 20.04 LTS
   linux-image-5.15.0-179-lowlatency  5.15.0-179.189~20.04.1
                                   Available with Ubuntu Pro
   linux-image-5.15.0-179-lowlatency-64k  5.15.0-179.189~20.04.1
                                   Available with Ubuntu Pro
   linux-image-lowlatency-5.15     5.15.0.179.189~20.04.1
                                   Available with Ubuntu Pro
   linux-image-lowlatency-64k-5.15  5.15.0.179.189~20.04.1
                                   Available with Ubuntu Pro
   linux-image-lowlatency-64k-hwe-20.04  5.15.0.179.189~20.04.1
                                   Available with Ubuntu Pro
   linux-image-lowlatency-hwe-20.04  5.15.0.179.189~20.04.1
                                   Available with Ubuntu Pro

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-8305-2
   https://ubuntu.com/security/notices/USN-8305-1
   CVE-2026-31419, CVE-2026-31431, CVE-2026-31504, CVE-2026-31533,
   CVE-2026-43033, CVE-2026-43077, CVE-2026-43078



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