SB20260918319 - Improper input validation in Linux kernel mac80211
Published: September 18, 2026
Security Bulletin ID
SB20260918319
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Adjecent network
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper input validation (CVE-ID: CVE-2026-90344)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: 7.1 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper input validation in the mac80211 channel switch announcement parser when processing a channel switch announcement that advertises channel zero. A remote attacker can advertise a channel switch to channel zero to cause a denial of service.
The firmware-crash condition applies to Intel devices.
Remediation
Install update from vendor's website.