PT-2026-27644 · Linux · Linux Kernel

Jann Horn · Published 2026-01-01 · Updated 2026-05-22 · CVE-2026-23279

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Linux kernel versions 3.13 through 6.17.0-5

Description A flaw exists in the Linux kernel's mac80211 module related to handling of mesh networking frames. Specifically, a NULL pointer dereference can occur in the mesh rx csa frame() function when processing SPECTRUM MGMT/CHL SWITCH action frames. This happens when a received CSA action frame lacks the Mesh Channel Switch Parameters IE, causing ieee802 11 parse elems() to set elems->mesh chansw params ie to NULL. Subsequently, the code attempts to dereference this NULL pointer at lines 1638 and 1642, leading to a kernel crash. A remote mesh peer with an established peer link (PLINK ESTAB) can trigger this by sending a crafted frame. The issue has been present since kernel version 3.13.

Recommendations Update the Linux kernel to a version beyond 6.17.0-5.

Exploit

Fix

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

CVE-2026-23279

ECHO-1119-E7BA-6917

OPENSUSE-SU-2026:20826-1

SUSE-SU-2026:21841-1

SUSE-SU-2026:21845-1

SUSE-SU-2026:21860-1

Affected Products

Linux Kernel

References · 23

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23279.json · Exploit
• https://git.kernel.org/stable/c/cc6d5a3c0a854aeae00915fc5386570c86029c60 · Patch
• https://git.kernel.org/stable/c/22a9adea7e26d236406edc0ea00b54351dd56b9c · Patch
• https://git.kernel.org/stable/c/2b5f282b1b7241ef624c3399a1cdff0bb1a3eeab · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-23279 · Security Note
• https://git.kernel.org/stable/c/753ad20dcbe36b67088c7770d8fc357d7cc43e08 · Patch
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-23279 · Vendor Advisory
• https://osv.dev/vulnerability/BELL-CVE-2026-23279 · Vendor Advisory
• https://git.kernel.org/stable/c/f061336f072ab03fd29270ae61fede46bf8fd69d · Patch
• https://git.kernel.org/stable/c/f5d8af683410a8c82e48b51291915bd612523d9a · Patch
• https://cve.org/CVERecord?id=CVE-2026-23279 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-23279 · Vendor Advisory
• https://git.kernel.org/stable/c/017c1792525064a723971f0216e6ef86a8c7af11 · Patch
• https://osv.dev/vulnerability/CVE-2026-23279 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-23279 · Vendor Advisory