io_uring/poll: fix signed comparison in io_poll_get_ownership()

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Summary

CVECVE-2026-52933
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-24 08:16:23 UTC
Updated2026-07-08 15:28:00 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.001200000 probability, percentile 0.021850000 (date 2026-07-09)

Problem Types: CWE-835

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected a26a35e9019fd70bf3cf647dcfdae87abc7bacea 81bf96b0abbfa4cd47ea32e12596aed3855fb2f3 git Not specified
CNA Linux Linux affected a26a35e9019fd70bf3cf647dcfdae87abc7bacea cf522703d4f194991615763697ae25a3f9539763 git Not specified
CNA Linux Linux affected a26a35e9019fd70bf3cf647dcfdae87abc7bacea fc47043f3d9af3efa407665b47f8378ec691ba18 git Not specified
CNA Linux Linux affected a26a35e9019fd70bf3cf647dcfdae87abc7bacea ea0697129807d718037f618221037aa0660ee3c5 git Not specified
CNA Linux Linux affected a26a35e9019fd70bf3cf647dcfdae87abc7bacea c6d191164dc81838d8dbf452a6000f68c558d1ae git Not specified
CNA Linux Linux affected a26a35e9019fd70bf3cf647dcfdae87abc7bacea 326941b22806cbf2df1fbfe902b7908b368cce42 git Not specified
CNA Linux Linux affected 4b702b7d11ce1b9d26fc6d7c5a7ef4ac1d455048 git Not specified
CNA Linux Linux affected bc4e6ee16778149811333a969a7a893d4cc110c5 git Not specified
CNA Linux Linux affected 5.15.82 5.16 semver Not specified
CNA Linux Linux affected 6.0.11 6.1 semver Not specified
CNA Linux Linux affected 6.1 Not specified
CNA Linux Linux unaffected 6.1 semver Not specified
CNA Linux Linux unaffected 6.1.175 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.140 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.86 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.27 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.4 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/fc47043f3d9af3efa407665b47f8378ec691ba18 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/81bf96b0abbfa4cd47ea32e12596aed3855fb2f3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/ea0697129807d718037f618221037aa0660ee3c5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/cf522703d4f194991615763697ae25a3f9539763 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/c6d191164dc81838d8dbf452a6000f68c558d1ae 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/326941b22806cbf2df1fbfe902b7908b368cce42 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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