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Incorrect Synchronization The advisory has been revoked - it doesn't affect any version of package python3-perf  (opens in a new tab)

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EPSS
0.17% (6th percentile)

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  • Snyk IDSNYK-CENTOS10-PYTHON3PERF-21289626
  • 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 python3-perf package and not the python3-perf 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.