# nvmet-tcp: reject unsolicited H2CData PDUs

CVE record · `CVE-2026-89968`

- **Identifiers:** `CVE-2026-89968`
- **State:** Confirmed
- **Severity:** CVSS 7.5 High
- **Critical:** No
- **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.

## Affected products, as the CNA wrote them

- Vendor: Linux. Product: Linux.
  - affected: `872d26a391da92ed8f0c0f5cb5fef428067b7f30 to before 02341ee424fb2eed16b5b8a9d247492e49335c21` (git)
  - affected: `872d26a391da92ed8f0c0f5cb5fef428067b7f30 to before cade124c06f8e738e3a0df285ed2e08953e6bfaa` (git)
  - affected: `872d26a391da92ed8f0c0f5cb5fef428067b7f30 to before 14beef7d4f123fb458fc9844aa74a071871dcca6` (git)
  - affected: `872d26a391da92ed8f0c0f5cb5fef428067b7f30 to before 9fb527103e53fd43a8e802c2eca407869c204f7a` (git)
  - affected: `872d26a391da92ed8f0c0f5cb5fef428067b7f30 to before 2b71f9193e3d3a352920ba367f1a6db345249038` (git)
  - affected: `872d26a391da92ed8f0c0f5cb5fef428067b7f30 to before cf1484d9a75de6809ef331e16f525aaa41b0e16d` (git)
  - affected: `872d26a391da92ed8f0c0f5cb5fef428067b7f30 to before 1cbed7538946c99e585acefd11c9ba3a0bdbae05` (git)
  - affected: `872d26a391da92ed8f0c0f5cb5fef428067b7f30 to before db62b35cbca052860c519cbcabe7650708528738` (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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0082, the 57th 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-2026-89968](https://www.cve.org/CVERecord?id=CVE-2026-89968)
- [NVD: CVE-2026-89968](https://nvd.nist.gov/vuln/detail/CVE-2026-89968)

### References from the CNA

- <https://git.kernel.org/stable/c/02341ee424fb2eed16b5b8a9d247492e49335c21>
- <https://git.kernel.org/stable/c/cade124c06f8e738e3a0df285ed2e08953e6bfaa>
- <https://git.kernel.org/stable/c/14beef7d4f123fb458fc9844aa74a071871dcca6>
- <https://git.kernel.org/stable/c/9fb527103e53fd43a8e802c2eca407869c204f7a>
- <https://git.kernel.org/stable/c/2b71f9193e3d3a352920ba367f1a6db345249038>
- <https://git.kernel.org/stable/c/cf1484d9a75de6809ef331e16f525aaa41b0e16d>
- <https://git.kernel.org/stable/c/1cbed7538946c99e585acefd11c9ba3a0bdbae05>
- <https://git.kernel.org/stable/c/db62b35cbca052860c519cbcabe7650708528738>

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-2026-89968>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

---

The web page: <https://agentprime.io/advisories/CVE-2026-89968/>. Everything for agents: <https://agentprime.io/llms.txt>.