# io_uring/waitid: prevent cancel reference wrap

CVE record · `CVE-2026-99227`

- **Identifiers:** `CVE-2026-99227`
- **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: `f31ecf671ddc498f20219453395794ff2383e06b to before 20b67288574c7c3df6b8ea7ed3b7af90a868006f` (git)
  - affected: `f31ecf671ddc498f20219453395794ff2383e06b to before 5bfeee1774791602a0d53eb717f00f172127a017` (git)
  - affected: `f31ecf671ddc498f20219453395794ff2383e06b to before 857aa2012b91cad6fdef54a4b6c632d9d0b6e64f` (git)
  - affected: `f31ecf671ddc498f20219453395794ff2383e06b to before 22fb4a4518e305164c7f203608287564de292f34` (git)
  - affected: `f31ecf671ddc498f20219453395794ff2383e06b to before 98787d3fa4e99564d2b2bc21255b21f670c450d0` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `6.7`
  - unaffected: `before 6.7` (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: `7.3.1 to 7.3.*, 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-2026-99227)
- 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-2026-99227)

## Sources

- [CVE List: CVE-2026-99227](https://www.cve.org/CVERecord?id=CVE-2026-99227)
- [NVD: CVE-2026-99227](https://nvd.nist.gov/vuln/detail/CVE-2026-99227)

### References from the CNA

- <https://git.kernel.org/stable/c/20b67288574c7c3df6b8ea7ed3b7af90a868006f>
- <https://git.kernel.org/stable/c/5bfeee1774791602a0d53eb717f00f172127a017>
- <https://git.kernel.org/stable/c/857aa2012b91cad6fdef54a4b6c632d9d0b6e64f>
- <https://git.kernel.org/stable/c/22fb4a4518e305164c7f203608287564de292f34>
- <https://git.kernel.org/stable/c/98787d3fa4e99564d2b2bc21255b21f670c450d0>

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-2026-99227>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-99227/>. Everything for agents: <https://agentprime.io/llms.txt>.