# tcp: reject net_iov in zerocopy receive mapping hints

CVE record · `CVE-2026-99055`

- **Identifiers:** `CVE-2026-99055`
- **State:** Confirmed
- **Severity:** No CVSS score
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 23 Oct 2026
- **Updated:** 23 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 23 Oct 2026, 12:22 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: `9f6b619edf2e85746f261b42ae8f818a59d126f7 to before 563d3564513496b9ce3b3ba7a5154427554d0f06` (git)
  - affected: `9f6b619edf2e85746f261b42ae8f818a59d126f7 to before 1c7463ac0e99cc91c4eecc1b69a740ef1a619932` (git)
  - affected: `9f6b619edf2e85746f261b42ae8f818a59d126f7 to before 3aa6f536a95eb0617c313ae2eb76fdfa85331f85` (git)
  - affected: `9f6b619edf2e85746f261b42ae8f818a59d126f7 to before 8b1f0af1fd5fd113432233ed8a3862ee7c30a84f` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `6.12`
  - unaffected: `before 6.12` (semver)
  - unaffected: `6.12.113 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.57 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.11 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 8 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 23 Oct 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-99055](https://www.cve.org/CVERecord?id=CVE-2026-99055)
- [NVD: CVE-2026-99055](https://nvd.nist.gov/vuln/detail/CVE-2026-99055)

### References from the CNA

- <https://git.kernel.org/stable/c/563d3564513496b9ce3b3ba7a5154427554d0f06>
- <https://git.kernel.org/stable/c/1c7463ac0e99cc91c4eecc1b69a740ef1a619932>
- <https://git.kernel.org/stable/c/3aa6f536a95eb0617c313ae2eb76fdfa85331f85>
- <https://git.kernel.org/stable/c/8b1f0af1fd5fd113432233ed8a3862ee7c30a84f>

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-2026-99055>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-99055/>. Everything for agents: <https://agentprime.io/llms.txt>.