#VU124577 NULL Pointer Dereference in Linux kernel - CVE-2026-23286
Published: March 25, 2026
Vulnerability identifier: #VU124577
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-2026-23286
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 user to cause a denial of service.
The vulnerability exists due to a null pointer dereference in the ATM LANE (LAN Emulation) module when handling VCC closure. A local user can trigger the closure of a shared atm_vcc, which is referenced by multiple lec_arp_table entries, causing a null-ptr-deref crash during subsequent cleanup attempts.
The issue arises because the cleanup function lec_arp_clear_vccs() does not verify whether the associated private data (vpriv) has already been released, leading to a crash upon dereferencing a NULL pointer in a later iteration.
Remediation
Install security update from vendor's repository.
External links
- https://git.kernel.org/stable/c/101bacb303e89dc2e0640ae6a5e0fb97c4eb45bb
- https://git.kernel.org/stable/c/2d9f57ea29a1f1772373b98a509b44d49fda609e
- https://git.kernel.org/stable/c/5f1cfea7921f5c126a441d973690eeba52677b64
- https://git.kernel.org/stable/c/622062f24644b4536d3f437e0cf7a8c4bb421665
- https://git.kernel.org/stable/c/7ea92ab075d809ec8a96669a5ecf00f752057875
- https://git.kernel.org/stable/c/e9665986eb127290ceb535bd5d04d7a84265d94f