#VU124906 Use-after-free in Linux kernel - CVE-2026-23461
Published: April 6, 2026
Vulnerability identifier: #VU124906
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-2026-23461
CWE-ID: CWE-416
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 use-after-free in l2cap_unregister_user when accessing conn->users and conn->hchan concurrently with l2cap_conn_del(). A local attacker can trigger a race condition to cause a denial of service.
The issue is caused by inconsistent locking on the l2cap_conn structure and may also result in list corruption.
Remediation
Install security update from vendor's repository.
External links
- https://git.kernel.org/stable/c/11a87dd5df428a4b79a84d2790cac7f3c73f1f0d
- https://git.kernel.org/stable/c/71030f3b3015a412133a805ff47970cdcf30c2b8
- https://git.kernel.org/stable/c/752a6c9596dd25efd6978a73ff21f3b592668f4a
- https://git.kernel.org/stable/c/c22a5e659959eb77c2fbb58a5adfaf3c3dab7abf
- https://git.kernel.org/stable/c/da3000cbe4851458a22be38bb18c0689c39fdd5f