SB20260325175 - NULL Pointer Dereference in Linux kernel mac80211

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Main Vulnerability Database SB20260325175

SB20260325175 - NULL Pointer Dereference in Linux kernel mac80211

Published: March 25, 2026

Security Bulletin ID SB20260325175
Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Adjecent network
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 security vulnerability.


1) NULL Pointer Dereference (CVE-ID: CVE-2026-23279)

The vulnerability allows a remote user to cause a denial of service.

The vulnerability exists due to a NULL pointer dereference in the mesh_rx_csa_frame() function in the mac80211 subsystem when handling received CSA action frames. A remote user can send a specially crafted SPECTRUM_MGMT/CHL_SWITCH action frame that omits the Mesh Channel Switch Parameters IE but includes valid Mesh ID and Mesh Configuration IEs to cause a kernel NULL pointer dereference.

Exploitation requires an established mesh peer link (PLINK_ESTAB) and no additional authentication beyond open mesh peering.


Remediation

Install update from vendor's website.

References