Infinite loop in Linux kernel - CVE-2026-99244
Published: November 3, 2026
Vulnerability identifier: #VU158998
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-2026-99244
CWE-ID: CWE-835
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to potentially cause a denial of service through excessive CPU consumption.
The vulnerability exists due to improper handling of notification signals in zap_pid_ns_processes() when waiting for processes in a PID namespace to exit. A local user can potentially trigger PID namespace teardown under conditions where TIF_NOTIFY_SIGNAL is repeatedly raised to cause the namespace reaper to busy-wait instead of sleeping, consuming CPU resources.
Affected software
Linux kernel
How to mitigate CVE-2026-99244
Install security update from vendor's repository.
External References
- https://git.kernel.org/stable/c/2c20ace1698d03a23467351be1d281e89b36ade3
- https://git.kernel.org/stable/c/30b274508c743f243c82904954c4e416d7143d4c
- https://git.kernel.org/stable/c/3d15ac36ce174477efa5365e424dbd47950fd2b9
- https://git.kernel.org/stable/c/70178691c467c8f9f722765299fd8524c3121a35
- https://git.kernel.org/stable/c/9ab0324f4868eeb20c63f063a1e5bc01d5539212
- https://git.kernel.org/stable/c/f46cd8241d9b83f2279cc0db3e9d3e181b548a59