Improper locking in Linux kernel - CVE-2026-46015
Published: May 28, 2026
Vulnerability identifier: #VU132479
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-2026-46015
CWE-ID: CWE-667
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 notification handling in inet_csk_listen_stop() when migrating an established child socket between listeners in the same SO_REUSEPORT group. A local user can trigger listener migration to cause poll()/epoll_wait() waiters and blocking accept() callers to remain asleep indefinitely.
Nonblocking accept() is not affected because it checks the accept queue directly.
How to mitigate CVE-2026-46015
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/12625b4da84caf4d84a04988710a7b9bcf702b18
- https://git.kernel.org/stable/c/3864c6ba1e041bc75342353a70fa2a2c6f909923
- https://git.kernel.org/stable/c/83bb57635d7cbafde32f865b577ecfd969f02337
- https://git.kernel.org/stable/c/ab5fdcd535645f6dbe6e9e21d96a08d141e88b4b
- https://git.kernel.org/stable/c/bebd058ef40c67a81fe6d9ee8beaa4ede90e0704