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Vulnerability record · CVE-2026-52933 · published 24 June 2026

CVE-2026-52933: Linux kernel vulnerability

Linux · Linux Kernel

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.

7.8 CVSS 3.1 High EPSS 0.18% · top 93.6% CWE-835 · CWE-835
7.8CVSS 3.1 base score
0.18%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
7References
8 Sep 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/326941b22806cbf2df1fbfe902b7908b368cce42 Patch
https://git.kernel.org/stable/c/81bf96b0abbfa4cd47ea32e12596aed3855fb2f3 Patch
https://git.kernel.org/stable/c/c6d191164dc81838d8dbf452a6000f68c558d1ae Patch
https://git.kernel.org/stable/c/cf522703d4f194991615763697ae25a3f9539763 Patch
https://git.kernel.org/stable/c/ea0697129807d718037f618221037aa0660ee3c5 Patch
https://git.kernel.org/stable/c/fc47043f3d9af3efa407665b47f8378ec691ba18 Patch
https://cert-portal.siemens.com/productcert/html/ssa-019113.html

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Source: NIST National Vulnerability Database (record CVE-2026-52933), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.