CVE-2026-80866
UnknownSummary
In the Linux kernel's TIPC subsystem, tipc_exit_net() contains a busy-wait loop waiting for UDP bearer cleanup works to complete. Under certain conditions (e.g., high-priority task or non-preemptive kernel), the loop can run for a long time, wasting CPU cycles and leading to soft lockups. The fix replaces the loop with wait_var_event().
Risk Assessment
It can cause significant CPU load and system hang (soft lockup), impacting network service availability.
Recommendation
Apply the kernel patch that replaces the busy loop in tipc_exit_net() with wait_var_event().
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: tipc: avoid busy looping in tipc_exit_net() Blamed commit introduced a busy-wait loop in tipc_exit_net() to wait for pending UDP bearer cleanup works to complete: while (atomic_read(&tn->wq_count)) cond_resched(); This loop can busy-wait for a long time if cond_resched() is a NOP. This typically happens if the netns exit is executed by a high priority task, or under kernels configured without preemption (CONFIG_PREEMPT_NONE). In such cases, it wastes CPU cycles and can lead to soft lockups. Fix this by replacing the busy loop with wait_var_event(), allowing the thread to sleep properly until the work queue count reaches zero. Accordingly, update cleanup_bearer() to use atomic_dec_and_test() and wake_up_var() to wake up the waiter when the count drops to zero. This uses the global wait queue hash table, avoiding the need to bloat struct tipc_net with a wait_queue_head_t. The atomic_dec_and_test() provides the necessary memory barrier to ensure the wakeup is not missed.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS