#VU124581 NULL Pointer Dereference in Linux kernel - CVE-2026-23279
Published: March 25, 2026
Vulnerability identifier: #VU124581
Vulnerability risk: Medium
CVSSv4.0: 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/E:U/U:Green
CVE-ID: CVE-2026-23279
CWE-ID: CWE-476
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vulnerable software:
Linux kernel
Linux kernel
Software vendor:
Linux Foundation
Linux Foundation
Description
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 security update from vendor's repository.
External links
- https://git.kernel.org/stable/c/017c1792525064a723971f0216e6ef86a8c7af11
- https://git.kernel.org/stable/c/22a9adea7e26d236406edc0ea00b54351dd56b9c
- https://git.kernel.org/stable/c/2b5f282b1b7241ef624c3399a1cdff0bb1a3eeab
- https://git.kernel.org/stable/c/be8b82c567fda86f2cbb43b7208825125bb31421
- https://git.kernel.org/stable/c/cc6d5a3c0a854aeae00915fc5386570c86029c60
- https://git.kernel.org/stable/c/f5d8af683410a8c82e48b51291915bd612523d9a