CVE-2026-52933 - io_uring/poll: fix signed comparison in io_poll_get_ownership()

CVE-2026-52933 - io_uring/poll: fix signed comparison in io_poll_get_ownership()

https://cvefeed.io/rssfeed/latest.atom / Wed, 06/24/2026 - 13:01
CVE ID :CVE-2026-52933
Published : June 24, 2026, 7:14 a.m. | 2 hours, 26 minutes ago
Description :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: 0.0 | NA
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