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Incorrect Synchronization The advisory has been revoked - it doesn't affect any version of package libperf  (opens in a new tab)

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EPSS
0.17% (6th percentile)

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  • Snyk IDSNYK-CENTOS10-LIBPERF-21289589
  • published21 Oct 2026
  • disclosed9 Sept 2026
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Introduced: 9 Sep 2026

CVE-2026-80920  (opens in a new tab)
CWE-821  (opens in a new tab)

Amendment

The Centos security team deemed this advisory irrelevant for Centos:10.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libperf package and not the libperf package as distributed by Centos.

In the Linux kernel, the following vulnerability has been resolved:

io_uring: defer eventfd signaling when queued from a wakeup handler

io_req_local_work_add() signals the CQ ring eventfd inline when it is the one to push the first entry onto ->work_list. For DEFER_TASKRUN rings that add is frequently done from a waitqueue wakeup handler, where an arbitrary waitqueue lock is held.

eventfd_signal_mask() only refuses to recurse when current->in_eventfd is set, but that bit is set by eventfd_signal_mask() itself. If the wake chain starts somewhere else, signal goes out inline and can feed back into epoll.

Add IOU_F_TWQ_IN_WAKE, set it on the task_work add done from the three waitqueue callbacks, and use it to force io_eventfd_signal() down the existing call_rcu_hurry() deferral instead of signaling inline.