# io_uring: defer eventfd signaling when queued from a wakeup handler

CVE record · `CVE-2026-80920`

- **Identifiers:** `CVE-2026-80920`
- **State:** Confirmed
- **Severity:** No CVSS score
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 9 Sept 2026
- **Updated:** 21 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 9 Sept 2026, 16:13 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

## Affected products, as the CNA wrote them

- Vendor: Linux. Product: Linux.
  - affected: `21a091b970cdbcf3e8ff829234b51be6f9192766 to before d0c240f25e654442a72af5ca021a02165ccce638` (git)
  - affected: `21a091b970cdbcf3e8ff829234b51be6f9192766 to before 9d984451baf768ecd9e1fdad4637b729fcb2c9d5` (git)
  - affected: `21a091b970cdbcf3e8ff829234b51be6f9192766 to before e22f4494cc9487d326e5e3067f33dea7c1e442b2` (git)
  - affected: `21a091b970cdbcf3e8ff829234b51be6f9192766 to before b6bb334b0e9348887e3e55e1f494b0c3b8fbf59f` (git)
  - affected: `21a091b970cdbcf3e8ff829234b51be6f9192766 to before 40b6ccf68731809ceb85c6e9f0f8f2ed61c7aa5a` (git)
  - affected: `21a091b970cdbcf3e8ff829234b51be6f9192766 to before cd305ee3633a45fcf5f3a5d83f99f3cb77d87b6e` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `6.1`
  - unaffected: `before 6.1` (semver)
  - unaffected: `6.6.160 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.114 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.49 to 6.18.*, inclusive` (semver)
  - unaffected: `7.1.11 to 7.1.*, inclusive` (semver)
  - unaffected: `7.2.1 to 7.2.*, inclusive` (semver)
  - unaffected: `7.3 to *, inclusive` (original_commit_for_fix)
  - Other versions: affected

## Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

## Severity and exploitation

No source has published a CVSS score for this record yet.

- **CISA KEV:** Not listed.
- **EPSS:** 0.0017, the 6th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

This record came from the full history of the CVE Program, published 9 Sept 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-80920](https://www.cve.org/CVERecord?id=CVE-2026-80920)
- [NVD: CVE-2026-80920](https://nvd.nist.gov/vuln/detail/CVE-2026-80920)

### References from the CNA

- <https://git.kernel.org/stable/c/d0c240f25e654442a72af5ca021a02165ccce638>
- <https://git.kernel.org/stable/c/9d984451baf768ecd9e1fdad4637b729fcb2c9d5>
- <https://git.kernel.org/stable/c/e22f4494cc9487d326e5e3067f33dea7c1e442b2>
- <https://git.kernel.org/stable/c/b6bb334b0e9348887e3e55e1f494b0c3b8fbf59f>
- <https://git.kernel.org/stable/c/40b6ccf68731809ceb85c6e9f0f8f2ed61c7aa5a>
- <https://git.kernel.org/stable/c/cd305ee3633a45fcf5f3a5d83f99f3cb77d87b6e>

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.

## Check whether this affects you

This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it. Compare the affected versions above with what you run.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), `get_advisory` returns this record and `search_advisories` finds related ones. Setup: <https://agentprime.io/mcp.md>
- As JSON: <https://api.agentprime.io/v1/advisories/CVE-2026-80920>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-80920/>. Everything for agents: <https://agentprime.io/llms.txt>.