CVE-2026-52933
In the Linux kernel, the following vulnerability has been resolved: io_uring/poll: fix signed comparison in io_poll_get_ownership() io_poll_get_ownership() uses a signed comparison to check whether poll_refs has reached the threshold for the slowpath: if (unlikely(atomic_read(&req->poll_refs) >= IO_POLL_REF_BIAS)) atomic_read() returns int (signed). When IO_POLL_CANCEL_FLAG (BIT(31)) is set in poll_refs, the value becomes negative in signed arithmetic, so the >= 128 comparison always evaluates to false and the slowpath is never taken. Fix this by casting the atomic_read() result to unsigned int before the comparison, so that the cancel flag is treated as a large positive value and correctly triggers the slowpath.
Affected versions
Linux kernel versions
5.15.82,
6.0.11,
6.1
and later are affected. Fixed in
6.1.175,
6.6.140,
6.12.86,
6.18.27,
7.0.4,
7.1
and their respective stable series.
References
6 totalFrequently asked questions
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What is CVE-2026-52933?
CVE-2026-52933 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 5.15.82 onward and has been patched in 6.1.175, 6.6.140, 6.12.86 and others. CVE-2026-52933 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-52933?
Yes — CVE-2026-52933 has been patched. Fixed versions include 6.1.175, 6.6.140, 6.12.86 and others. If you are running Linux kernel 5.15.82 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-52933 actively exploited?
No — CVE-2026-52933 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.