NULL pointer dereference in Linux kernel - CVE-2026-46233
Published: May 29, 2026
Vulnerability identifier: #VU132969
CSH Severity: Low
CVSS v4.0: 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-2026-46233
CWE-ID: CWE-476
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a null pointer dereference in batadv_bla_purge_claims() when traversing the list of claims during concurrent claim release. A local user can trigger concurrent claim handling to cause a denial of service.
The issue occurs because a claim being released may have its backbone_gw pointer set to NULL before delayed RCU freeing completes.
How to mitigate CVE-2026-46233
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/7b7ebb7222a5524ce58e48cc9c6d688320ea6cfe
- https://git.kernel.org/stable/c/7b8fbcee3184d848b5aee085ca16d0cf05c9b641
- https://git.kernel.org/stable/c/ab3dbd07a809a8eb30c7ddfab9ac886ed30dce8d
- https://git.kernel.org/stable/c/b65365d2b1e6095c538d49baeb140dd1c166c1b3
- https://git.kernel.org/stable/c/cf6b604011591865ae39ac82de8978c1120d17af