Infinite loop in Linux kernel - CVE-2026-80866
Published: September 5, 2026
Vulnerability identifier: #VU147049
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-2026-80866
CWE-ID: CWE-835
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 busy-wait loop in tipc_exit_net() when waiting for pending UDP bearer cleanup work during network namespace exit. A local user can trigger network namespace exit while cleanup work is pending to cause a denial of service.
The issue can result in soft lockups when the exit is executed by a high-priority task or on kernels configured with CONFIG_PREEMPT_NONE.
Affected software
Linux kernel
How to mitigate CVE-2026-80866
Install security update from vendor's repository.