Ubuntu 20.04 8391

A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 20.04 LTS - Ubuntu 18.04 LTS Summary: Several security issues were fixed in the Linux kernel. Software Description: - linux-raspi: Linux kernel for Raspberry Pi systems - linux-raspi-5.4: Linux kernel for Raspberry Pi systems 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) It was discovered that the Linux kernel did not properly handle shared page fragments during socket buffer operations, collectively known as Dirty Frag. A logic flaw existed in the XFRM ESP-in-TCP subsystem and in the RxRPC networking subsystem when processing paged fragments. A local attacker could use this to escalate privileges, or possibly escape a container. (CVE-2026-43284, CVE-2026-43500) Several security i...

The problem can be corrected by updating your system to the following package versions: Ubuntu 20.04 LTS linux-image-5.4.0-1143-raspi 5.4.0-1143.156 Available with Ubuntu Pro linux-image-raspi 5.4.0.1143.174 Available with Ubuntu Pro linux-image-raspi-5.4 5.4.0.1143.174 Available with Ubuntu Pro linux-image-raspi2 5.4.0.1143.174 Available with Ubuntu Pro Ubuntu 18.04 LTS linux-image-5.4.0-1143-raspi 5.4.0-1143.156~18.04.1 Available with Ubuntu Pro linux-image-raspi-5.4 5.4.0.1143.156~18.04.1 Available with Ubuntu Pro linux-image-raspi-hwe-18.04 5.4.0.1143.156~18.04.1 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.

CVE-2024-50304, CVE-2026-23112, CVE-2026-23209, CVE-2026-31431,

CVE-2026-31504, CVE-2026-31533, CVE-2026-43033, CVE-2026-43077,

CVE-2026-43078, CVE-2026-43284, CVE-2026-43494, CVE-2026-43500,

Ubuntu Security Notice USN-8391-1

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