ublk: reset per-IO canceled flag on each fetch

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Summary

CVECVE-2026-53124
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-24 17:17:27 UTC
Updated2026-07-14 15:26:52 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: ublk: reset per-IO canceled flag on each fetch If a ublk server starts recovering devices but dies before issuing fetch commands for all IOs, cancellation of the fetch commands that were successfully issued may never complete. This is because the per-IO canceled flag can remain set even after the fetch for that IO has been submitted - the per-IO canceled flags for all IOs in a queue are reset together only once all IOs for that queue have been fetched. So if a nonempty proper subset of the IOs for a queue are fetched when the ublk server dies, the IOs in that subset will never successfully be canceled, as their canceled flags remain set, and this prevents ublk_cancel_cmd from actually calling io_uring_cmd_done on the commands, despite the fact that they are outstanding. Fix this by resetting the per-IO cancel flags immediately when each IO is fetched instead of waiting for all IOs for the queue (which may never happen).

Risk And Classification

EPSS: 0.001450000 probability, percentile 0.041910000 (date 2026-07-14)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 728cbac5fe219d3b8a21a0688a08f2b7f8aeda2b 63335e5a67d89bb7cb9b023bbb3785896587a648 git Not specified
CNA Linux Linux affected 728cbac5fe219d3b8a21a0688a08f2b7f8aeda2b 0842186d2c4e67d2f8c8c2d1d779e8acffd41b5b git Not specified
CNA Linux Linux affected 42ea64e01c96e594fb4f80c54dfe4f934d008a6e git Not specified
CNA Linux Linux affected 6.14.6 6.15 semver Not specified
CNA Linux Linux affected 6.15 Not specified
CNA Linux Linux unaffected 6.15 semver Not specified
CNA Linux Linux unaffected 7.0.10 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/63335e5a67d89bb7cb9b023bbb3785896587a648 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0842186d2c4e67d2f8c8c2d1d779e8acffd41b5b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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