Linux Kernel Security Update Advisory (CVE-2026-53266)

Overview

A security update has been released for CVE-2026-53266, a vulnerability in the Linux kernel. This vulnerability is described as an issue where data in shared memory pages can be unintentionally modified.

Affected Versions

The following Linux kernel versions are affected:

• 5.4.73 Through 5.5.
• 5.8.17 Through 5.9.
• 5.9.2 Through 5.10.
• 5.10.Y versions: 5.10 Or higher, but lower than 5.10.259.
• 5.15.Y versions: 5.15 Or higher, but lower than 5.15.210.
• 6.1.Y versions: 6.1 Or higher, but less than 6.1.176.
• 6.6.Y versions: 6.6 Or higher, but less than 6.6.143.
• Version 6.12.Y: 6.12 Or higher, but less than 6.12.94.
• Version 6.18.Y: 6.18 Or higher, but less than 6.18.36.
• Version 7.0.Y: 7.0 Or higher, but less than 7.0.13.

Resolution

A Vulnerability Patch for CVE-2026-53266 has been provided in the latest update. Updating to the following versions or higher resolves the vulnerability.

• Linux Kernel 5.10.Y: 5.10.259 Or later.
• Linux Kernel 5.15.Y: 5.15.210 Or later.
• Linux Kernel 6.1.Y: 6.1.176 Or later.
• Linux Kernel 6.6.Y: 6.6.143 Or later.
• Linux Kernel 6.12.Y: 6.12.94 Or later.
• Linux Kernel 6.18.Y: 6.18.36 Or later.
• Linux Kernel 7.0.Y: 7.0.13 Or later.
• Linux Kernel version: 7.1 Or later.

Note

The reference site lists CVE-2026-53266: netfilter: bridge: make ebt_snat ARP rewrite writable and CVE-2026-53266.