CVE-2026-52933 (GCVE-0-2026-52933)

Vulnerability from cvelistv5 – Published: 2026-06-24 07:14 – Updated: 2026-06-24 07:14
VLAI
Title
io_uring/poll: fix signed comparison in io_poll_get_ownership()
Summary
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: a26a35e9019fd70bf3cf647dcfdae87abc7bacea , < 81bf96b0abbfa4cd47ea32e12596aed3855fb2f3 (git)
Affected: a26a35e9019fd70bf3cf647dcfdae87abc7bacea , < cf522703d4f194991615763697ae25a3f9539763 (git)
Affected: a26a35e9019fd70bf3cf647dcfdae87abc7bacea , < fc47043f3d9af3efa407665b47f8378ec691ba18 (git)
Affected: a26a35e9019fd70bf3cf647dcfdae87abc7bacea , < ea0697129807d718037f618221037aa0660ee3c5 (git)
Affected: a26a35e9019fd70bf3cf647dcfdae87abc7bacea , < c6d191164dc81838d8dbf452a6000f68c558d1ae (git)
Affected: a26a35e9019fd70bf3cf647dcfdae87abc7bacea , < 326941b22806cbf2df1fbfe902b7908b368cce42 (git)
Affected: 4b702b7d11ce1b9d26fc6d7c5a7ef4ac1d455048 (git)
Affected: bc4e6ee16778149811333a969a7a893d4cc110c5 (git)
Affected: 5.15.82 , < 5.16 (semver)
Affected: 6.0.11 , < 6.1 (semver)
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Linux Linux Affected: 6.1
Unaffected: 0 , < 6.1 (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.140 , ≤ 6.6.* (semver)
Unaffected: 6.12.86 , ≤ 6.12.* (semver)
Unaffected: 6.18.27 , ≤ 6.18.* (semver)
Unaffected: 7.0.4 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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