Race condition in Linux kernel - CVE-2026-90091
Published: September 19, 2026
Vulnerability identifier: #VU151393
CSH Severity: Low
CVSS v4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-90091
CWE-ID: CWE-362
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a race condition in the L2CAP socket cleanup handler when concurrent L2CAP socket cleanup and channel teardown occur. A local user can trigger concurrent socket cleanup and channel teardown to cause a denial of service.
Affected software
Linux kernel
How to mitigate CVE-2026-90091
Install security update from vendor's repository.
External References
- https://git.kernel.org/stable/c/32a7bc6e93be36b37fe61f351d312d358195bd61
- https://git.kernel.org/stable/c/4f8c63fe0097c9f6ea34409f82f79b3894903d91
- https://git.kernel.org/stable/c/61d5ddbd524c715b224cbe7e9f01da4e05098b19
- https://git.kernel.org/stable/c/66d6ef18548ae6d7dd452b84115fc82c0a73a4ea
- https://git.kernel.org/stable/c/7c7ac736b50fa259ed1bdddc18d79523f07c0442
- https://git.kernel.org/stable/c/827de6bd2865b22aaabd554540def3b8a33018ab