Deadlock in Linux kernel - CVE-2026-99280
Published: November 8, 2026
Vulnerability identifier: #VU161898
CSH Severity: Low
CVSS v4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-99280
CWE-ID: CWE-833
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 reference-lifetime race causing a deadlock in ksmbd session management when session registration fails or connection cleanup overlaps with per-session procfs reads. A local user can read a session's procfs entry during these operations to cause the final reference release to call proc_remove() from its own callback, which then waits for itself to finish and hangs.
Affected software
Linux kernel
How to mitigate CVE-2026-99280
Install security update from vendor's repository.