CVE-2026-52933

HIGHPre-NVD 7.87.8—
EchelonGraph scoreHIGH confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-06-24. a secondary CVSS source baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
7.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.8Exploit: NoneExposed: 0

A fix is available — apply it.

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 v3
7.8
EG Score
7.8(high)
EPSS
2.2%
KEV
Not listed

Published

June 24, 2026

Last Modified

June 28, 2026

Advisory Details (6)

Auto-updated Jun 28, 2026
No patch confirmed yet.
generic

io_uring/poll: fix signed comparison in io_poll_get_ownership() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/fc47043f3d9af3efa407665b47f8378ec691ba18
generic

io_uring/poll: fix signed comparison in io_poll_get_ownership() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/ea0697129807d718037f618221037aa0660ee3c5
generic

io_uring/poll: fix signed comparison in io_poll_get_ownership() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/cf522703d4f194991615763697ae25a3f9539763
generic

io_uring/poll: fix signed comparison in io_poll_get_ownership() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c6d191164dc81838d8dbf452a6000f68c558d1ae
generic

io_uring/poll: fix signed comparison in io_poll_get_ownership() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/81bf96b0abbfa4cd47ea32e12596aed3855fb2f3
generic

io_uring/poll: fix signed comparison in io_poll_get_ownership() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/326941b22806cbf2df1fbfe902b7908b368cce42

Vendor Advisories for CVE-2026-52933(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(3)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-tools-oem-7.0 (7.0.0-1008.8) @ resolute2026-07-06ubuntu
ubuntulinux-virtual-hwe-26.04-edge (7.0.0-27.27) @ resolute2026-07-06ubuntu
ubuntulinux-tools-raspi-realtime-7.0 (7.0.0-1014.14) @ resolute2026-07-06ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

All Vendor Advisories

(3)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 38× in last 7d / 53× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-06 21:11 UTCEG score recompute
  2. 2026-07-06 21:10 UTCGHSA enrichment
  3. 2026-07-06 16:27 UTCEPSS rescore
  4. 2026-07-06 16:27 UTCEPSS rescore
  5. 2026-07-06 08:10 UTCEG score recompute
  6. 2026-07-06 08:10 UTCVendor advisory
  7. 2026-07-06 08:10 UTCGHSA enrichment
  8. 2026-07-05 19:09 UTCEG score recompute
  9. 2026-07-05 19:09 UTCVendor advisory
  10. 2026-07-05 19:09 UTCGHSA enrichment
  11. 2026-07-05 06:11 UTCEG score recompute
  12. 2026-07-05 06:11 UTCVendor advisory
  13. 2026-07-05 06:11 UTCGHSA enrichment
  14. 2026-07-04 17:11 UTCEG score recompute
  15. 2026-07-04 17:11 UTCVendor advisory
  16. 2026-07-04 17:11 UTCGHSA enrichment
  17. 2026-07-04 04:12 UTCEG score recompute
  18. 2026-07-04 04:12 UTCVendor advisory
  19. 2026-07-04 04:12 UTCGHSA enrichment
  20. 2026-07-03 15:07 UTCEG score recompute
  21. 2026-07-03 15:07 UTCGHSA enrichment
  22. 2026-07-03 02:07 UTCEG score recompute
  23. 2026-07-03 02:07 UTCVendor advisory
  24. 2026-07-03 02:06 UTCGHSA enrichment
  25. 2026-07-02 13:08 UTCEG score recompute
Show 28 more
  1. 2026-07-02 13:08 UTCVendor advisory
  2. 2026-07-02 13:08 UTCGHSA enrichment
  3. 2026-07-02 00:07 UTCEG score recompute
  4. 2026-07-02 00:07 UTCVendor advisory
  5. 2026-07-02 00:06 UTCGHSA enrichment
  6. 2026-07-01 15:07 UTCEPSS rescore
  7. 2026-07-01 11:07 UTCEG score recompute
  8. 2026-07-01 11:07 UTCGHSA enrichment
  9. 2026-06-30 23:22 UTCEPSS rescore
  10. 2026-06-30 22:08 UTCEG score recompute
  11. 2026-06-30 22:08 UTCGHSA enrichment
  12. 2026-06-30 09:09 UTCEG score recompute
  13. 2026-06-30 09:09 UTCGHSA enrichment
  14. 2026-06-29 20:10 UTCEG score recompute▲ 7.80
  15. 2026-06-29 20:10 UTCGHSA enrichment
  16. 2026-06-29 14:06 UTCEPSS rescore
  17. 2026-06-29 14:06 UTCEPSS rescore
  18. 2026-06-28 14:07 UTCEPSS rescore
  19. 2026-06-28 07:52 UTCMITRE cvelistV5CVSS v3 → 7.8 · severity → HIGH
  20. 2026-06-28 04:56 UTCEPSS rescore
  21. 2026-06-28 04:56 UTCEPSS rescore
  22. 2026-06-27 03:08 UTCEPSS rescore
  23. 2026-06-27 02:25 UTCEG score recompute
  24. 2026-06-27 02:25 UTCGHSA enrichment
  25. 2026-06-25 13:49 UTCEPSS rescore
  26. 2026-06-24 14:05 UTCEPSS rescore
  27. 2026-06-24 08:41 UTCEG score recompute
  28. 2026-06-24 08:40 UTCNVD updatefirst tracked

Frequently asked(5)

What is CVE-2026-52933?
CVE-2026-52933 is a high vulnerability published on June 24, 2026. In the Linux kernel, the following vulnerability has been resolved: iouring/poll: fix signed comparison in iopollgetownership() iopollget_ownership() uses a signed comparison to check whether poll_refs has reached the threshold for the slowpath: if (unlikely(atomicread(&req->pollrefs) >=…
When was CVE-2026-52933 disclosed?
CVE-2026-52933 was first published in the National Vulnerability Database on June 24, 2026, with the most recent update on June 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-52933 actively exploited?
CVE-2026-52933 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-52933?
CVE-2026-52933 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-52933?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-52933, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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