#VU124891 NULL pointer dereference in Linux kernel - CVE-2026-31394
Published: April 6, 2026
Vulnerability identifier: #VU124891
Vulnerability risk: Low
CVSSv4.0: 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/E:U/U:Clear
CVE-ID: CVE-2026-31394
CWE-ID: CWE-476
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerable software:
Linux kernel
Linux kernel
Software vendor:
Linux Foundation
Linux Foundation
Description
The vulnerability allows a local attacker to cause a denial of service.
The vulnerability exists due to a NULL pointer dereference in ieee80211_chan_bw_change for AP_VLAN stations when processing channel bandwidth changes during CSA. A local attacker can trigger the vulnerable code path to cause a denial of service.
The issue affects stations on AP_VLAN interfaces such as 4addr WDS clients, where link reservation data can remain zero-initialized with a NULL channel pointer.
Remediation
Install security update from vendor's repository.