SB20260812115 - Use-after-free in Linux kernel mac80211
Published: August 12, 2026
Security Bulletin ID
SB20260812115
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Use-after-free (CVE-ID: CVE-2026-68409)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local attacker to cause a denial of service.
The vulnerability exists due to a use-after-free in the mac80211 link RX stats handling in sta_remove_link() when processing concurrent link removal and RX fast-path access. A local attacker can trigger the race condition to cause a denial of service.
The issue occurs only when uses_rss is enabled, which is when pcpu_rx_stats exists.
Remediation
Install update from vendor's website.