NULL pointer dereference in Linux kernel - CVE-2026-43124
Published: May 7, 2026
Vulnerability identifier: #VU130613
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-2026-43124
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 improper handling of a NULL return value in persistent_ram_vmap() when mapping the persistent ram buffer. A local user can trigger the vulnerable code path to cause a denial of service.
The issue occurs when a failed vmap() call is treated as a successful mapping because a non-zero offset produces a non-NULL pointer, which can later lead to dereference of an invalid address.
How to mitigate CVE-2026-43124
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/05363abc7625cf18c96e67f50673cd07f11da5e9
- https://git.kernel.org/stable/c/1da904e84de608907662ad8a51ba9c571d61e003
- https://git.kernel.org/stable/c/2c99326dc1c79b7ce3c8dd92929b5ce724ff70eb
- https://git.kernel.org/stable/c/49918dd52615097529811d21ec6074dd02ebe77c
- https://git.kernel.org/stable/c/88d5b28f63c7aac1271784e3b800ed405d1cde75
- https://git.kernel.org/stable/c/8baa234181f632cabacf73e4834a910859e9fcc9
- https://git.kernel.org/stable/c/8d849adfbc3e98417fb541620568db1a759ef441
- https://git.kernel.org/stable/c/d47234840aeb4182ed3ee795c578b1dfa9cbd25b