CVE-2026-81010
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk3th percentile - higher than 3% of all known CVEs
Summary
In the Linux kernel, io_waitid_cb() in the io_uring subsystem does not honor the tw.cancel flag when the fallback task_work path runs from a kworker thread. This causes __do_wait() to be called in the wrong task context, potentially leading to incorrect waitid behavior.
Risk Assessment
Incorrect waitid behavior in a different task context may cause logic errors or information leaks in applications using io_uring. It affects kernel stability and predictability.
Recommendation
Update the Linux kernel to a version containing the fix that honors tw.cancel before calling __do_wait() and returns -ECANCELED. Verify whether the system uses io_uring and schedule the update accordingly.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: io_uring/waitid: honor task_work cancellation io_waitid_cb() may run through the fallback task_work path when task_work_add() can no longer queue work to the originating task. The fallback runs from a kworker and io_uring marks such task work as canceled through tw.cancel. io_waitid_cb() currently ignores tw.cancel and calls __do_wait(). waitid is task-context dependent: __do_wait() performs child lookup relative to current, and the retry path also uses current->signal->wait_chldexit. If the callback runs from the fallback kworker, current is therefore not the task that submitted the request. Honor tw.cancel before entering __do_wait(). Complete the request with -ECANCELED and skip the siginfo copy, since canceled task work may run without the submitting task's userspace execution context. Keep the existing siginfo handling for normal waitid completion and explicit cancellation.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS