# nvmet-tcp: fix out-of-bounds write when receiving an over-long PDU

CVE record · `CVE-2026-89969`

- **Identifiers:** `CVE-2026-89969`
- **State:** Confirmed
- **Severity:** CVSS 9.8 Critical
- **Critical:** Yes: CVSS 9+
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 16 Sept 2026
- **Updated:** 19 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 16 Sept 2026, 10:32 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.

## Critical

Critical, because:

- CVSS score 9.8: 9.0 or more.

How we decide what’s critical: <https://agentprime.io/advisories/critical.md>

## Affected products, as the CNA wrote them

- Vendor: Linux. Product: Linux.
  - affected: `872d26a391da92ed8f0c0f5cb5fef428067b7f30 to before a3f0bcfbaf3312a5754d1ce020a07d394669eb25` (git)
  - affected: `872d26a391da92ed8f0c0f5cb5fef428067b7f30 to before 4f84d42c53c49557fb1ef285c683b0a81b576c74` (git)
  - affected: `872d26a391da92ed8f0c0f5cb5fef428067b7f30 to before 58dc6035b79c4c73c0cbf9ec9f68a7f117b2b3e6` (git)
  - affected: `872d26a391da92ed8f0c0f5cb5fef428067b7f30 to before cf5f39d2b58f97e0cd1829c4a6aeef17f1607cca` (git)
  - affected: `872d26a391da92ed8f0c0f5cb5fef428067b7f30 to before 3a385e0c39efbe34db8edd95900c123113ae3450` (git)
  - affected: `872d26a391da92ed8f0c0f5cb5fef428067b7f30 to before dbc4acbdb3ca8c81441368ad7409b8f77d4de8f6` (git)
  - affected: `872d26a391da92ed8f0c0f5cb5fef428067b7f30 to before d95d342bc0ea82dc79e6362b2f1f997431750e4c` (git)
  - affected: `872d26a391da92ed8f0c0f5cb5fef428067b7f30 to before 14cc5a7e77731497d5bea70f3bb05df7eda982e4` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `5.0`
  - unaffected: `before 5.0` (semver)
  - unaffected: `5.10.270 to 5.10.*, inclusive` (semver)
  - unaffected: `5.15.221 to 5.15.*, inclusive` (semver)
  - unaffected: `6.1.188 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.157 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.110 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.51 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.5 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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0071, the 54th percentile, on 13 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 16 Sept 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-89969](https://www.cve.org/CVERecord?id=CVE-2026-89969)
- [NVD: CVE-2026-89969](https://nvd.nist.gov/vuln/detail/CVE-2026-89969)

### References from the CNA

- <https://git.kernel.org/stable/c/a3f0bcfbaf3312a5754d1ce020a07d394669eb25>
- <https://git.kernel.org/stable/c/4f84d42c53c49557fb1ef285c683b0a81b576c74>
- <https://git.kernel.org/stable/c/58dc6035b79c4c73c0cbf9ec9f68a7f117b2b3e6>
- <https://git.kernel.org/stable/c/cf5f39d2b58f97e0cd1829c4a6aeef17f1607cca>
- <https://git.kernel.org/stable/c/3a385e0c39efbe34db8edd95900c123113ae3450>
- <https://git.kernel.org/stable/c/dbc4acbdb3ca8c81441368ad7409b8f77d4de8f6>
- <https://git.kernel.org/stable/c/d95d342bc0ea82dc79e6362b2f1f997431750e4c>
- <https://git.kernel.org/stable/c/14cc5a7e77731497d5bea70f3bb05df7eda982e4>

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-2026-89969>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-89969/>. Everything for agents: <https://agentprime.io/llms.txt>.