CVE-2026-80866

CVE CVE-2026-80866EUVD EUVD-2026-71496Published 2026-09-04T16:48:11.000Z

What the advisory describes

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.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

• Linux — Linux patch: 7.2; patch: 7.1.5; patch: 0; 04c26faa51d1e2fe71cf13c45791f5174c37f986 <c1481c94e74c955e0448ddf46b8615a44d840c1e; 04c26faa51d1e2fe71cf13c45791f5174c37f986 <522d1d950b9e3b68190a6de7534827c8dccedb73; d1f76dfadaf8f47ed1753f97dbcbd41c16215ffa; 5.10.42 <5.11; 5195ec5e365a2a9331bfeb585b613a6e94f98dba; b9f5b7ad4ac3af006443f535b1ce7bff1d130d7d; 5.13; 5.4.124 <5.5; 5.12.9 <5.13

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.

• Linux — Linux

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