# io_uring/waitid: own the request before clearing ->head

CVE record · `CVE-2026-99231`

- **Identifiers:** `CVE-2026-99231`
- **State:** Confirmed
- **Severity:** CVSS 7.8 High
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 2 Nov 2026
- **Updated:** 3 Nov 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 2 Nov 2026, 16:06 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: `09951a4d37e33b0197afc7fb77e39f09a3213ee6 to before bf01da1a9cca4a54e5c30b8344e52c26afb87be7` (git)
  - affected: `934ffdd1cdef232eb125e63c2ebafb7f2deff6af to before 8381a912c65b8de16e8a848225c7c5a56b6ea834` (git)
  - affected: `ab673c1bcaf20ac70352eeb6bf5b828462676693 to before c10ad2813e15186fb51b37a4d17fafddc99e89a5` (git)
  - affected: `ab673c1bcaf20ac70352eeb6bf5b828462676693 to before c254eec4364b9f4b4cbdce43be3fb4df5a651a70` (git)
  - affected: `6.12.113 to before 6.12.115` (semver)
  - affected: `6.18.52 to before 6.18.60` (semver)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `6.19`
  - unaffected: `before 6.19` (semver)
  - unaffected: `6.12.115 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.60 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.14 to 7.2.*, inclusive` (semver)
  - unaffected: `7.4-rc1 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

- 7.8 High, CVSS 3.1: `CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`, from CNA (Linux)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0012, the 1st percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 2 Nov 2026, 16:06 UTC: [Confirmed by the CVE List](https://www.cve.org/CVERecord?id=CVE-2026-99231)
- 2 Nov 2026, 16:12 UTC: First seen by agentprime
- 2 Nov 2026, 16:17 UTC: [Confirmed by NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-99231)

## Sources

- [CVE List: CVE-2026-99231](https://www.cve.org/CVERecord?id=CVE-2026-99231)
- [NVD: CVE-2026-99231](https://nvd.nist.gov/vuln/detail/CVE-2026-99231)

### References from the CNA

- <https://git.kernel.org/stable/c/bf01da1a9cca4a54e5c30b8344e52c26afb87be7>
- <https://git.kernel.org/stable/c/8381a912c65b8de16e8a848225c7c5a56b6ea834>
- <https://git.kernel.org/stable/c/c10ad2813e15186fb51b37a4d17fafddc99e89a5>
- <https://git.kernel.org/stable/c/c254eec4364b9f4b4cbdce43be3fb4df5a651a70>

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-2026-99231>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-99231/>. Everything for agents: <https://agentprime.io/llms.txt>.