CVE-2026-52933
io_uring/poll: fix signed comparison in io_poll_get_ownership()
HIGH 7.8
At a glance
- Source
- NVD
- EPSS
- EPSS 0.15 % · percentile 4 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- Linux
- NVD status
- Modified
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.
Weaknesses (CWE)
- CWE-190 — Integer Overflow or Wraparound
- CWE-835 — Loop with Unreachable Exit Condition (Infinite Loop)
References
- https://git.kernel.org/stable/c/81bf96b0abbfa4cd47ea32e12596aed3855fb2f3
- https://git.kernel.org/stable/c/cf522703d4f194991615763697ae25a3f9539763
- https://git.kernel.org/stable/c/fc47043f3d9af3efa407665b47f8378ec691ba18
- https://git.kernel.org/stable/c/ea0697129807d718037f618221037aa0660ee3c5
- https://git.kernel.org/stable/c/c6d191164dc81838d8dbf452a6000f68c558d1ae
- https://git.kernel.org/stable/c/326941b22806cbf2df1fbfe902b7908b368cce42
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | Linux |
| CVSS 3.1 | HIGH 7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | NVD · 416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Secondary) |
European references
- ENISA EUVD · EUVD-2026-38703
- GCVE · GCVE-0-2026-52933
CERT-FR advisories
- CERTFR-2026-AVI-1385 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1333 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1298 — Multiples vulnérabilités dans les produits Siemens · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1286 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1204 — Multiples vulnérabilités dans le noyau Linux de Red Hat · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1066 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1029 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0956 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0954 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0927 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0926 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0866 — Multiples vulnérabilités dans Microsoft Azure Linux · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0862 — Multiples vulnérabilités dans le noyau Linux de Debian LTS · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0861 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0831 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
Affected configurations (NVD CPE)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 5.15.82 < 5.16cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.0.11 < 6.1cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.1.1 < 6.1.175cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.2 < 6.6.140cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.7 < 6.12.86cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.13 < 6.18.27cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.19 < 7.0.4cpe:2.3:o:linux:linux_kernel:6.1:-:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:6.1:rc7:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:6.1:rc8:*:*:*:*:*:*
Affected products
| Product | Versions |
|---|---|
| Linux · Linux | affected a26a35e9019fd70bf3cf647dcfdae87abc7bacea < 81bf96b0abbfa4cd47ea32e12596aed3855fb2f3 ; affected a26a35e9019fd70bf3cf647dcfdae87abc7bacea < cf522703d4f194991615763697ae25a3f9539763 ; affected a26a35e9019fd70bf3cf647dcfdae87abc7bacea < fc47043f3d9af3efa407665b47f8378ec691ba18 ; affected a26a35e9019fd70bf3cf647dcfdae87abc7bacea < ea0697129807d718037f618221037aa0660ee3c5 ; affected a26a35e9019fd70bf3cf647dcfdae87abc7bacea < c6d191164dc81838d8dbf452a6000f68c558d1ae ; affected a26a35e9019fd70bf3cf647dcfdae87abc7bacea < 326941b22806cbf2df1fbfe902b7908b368cce42 |
| Linux · Linux | affected 6.1 ; unaffected 0 < 6.1 ; unaffected 6.1.175 ≤ 6.1.* ; unaffected 6.6.140 ≤ 6.6.* ; unaffected 6.12.86 ≤ 6.12.* ; unaffected 6.18.27 ≤ 6.18.* |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |