SB20260812110 - Improper locking in Linux kernel mac80211

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Main Vulnerability Database SB20260812110

SB20260812110 - Improper locking in Linux kernel mac80211

Published: August 12, 2026

Security Bulletin ID SB20260812110
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Denial of service

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper locking (CVE-ID: CVE-2026-68405)

CWE-ID: CWE-667 - Improper Locking

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


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

The vulnerability exists due to improper lock handling in ieee80211_do_stop() for AP_VLAN packet cleanup when freeing queued SKBs associated with ps->bc_buf while IRQs are disabled. A local user can trigger AP_VLAN stop processing with buffered packets to cause a denial of service.

The issue occurs because ieee80211_free_txskb() may invoke reporting paths beyond passive SKB release while the IRQ-disabled lock is still held.


Remediation

Install update from vendor's website.

References