# nvme-tcp: do not accept C2HData based on blk_rq_payload_bytes() alone

CVE record · `CVE-2026-89482`

- **Identifiers:** `CVE-2026-89482`
- **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:** 11 Sept 2026
- **Updated:** 19 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 11 Sept 2026, 19:43 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: `25e5cb780e62bde432b401f312bb847edc78b432 to before 32ea8ce96b9bd797c59c351ce490ffd97adaa8c0` (git)
  - affected: `25e5cb780e62bde432b401f312bb847edc78b432 to before dd8906bb8f8d5bf1c9f861e1382c82b87bfe7cab` (git)
  - affected: `25e5cb780e62bde432b401f312bb847edc78b432 to before 7ed0b61bbc145988be292c4d3ec580aebd8d2bcd` (git)
  - affected: `25e5cb780e62bde432b401f312bb847edc78b432 to before b96e1ff75e5c0ad6e077ac002b1d30b0a2b49528` (git)
  - affected: `25e5cb780e62bde432b401f312bb847edc78b432 to before b36161701cb366f416afdcf70771d432a7c74753` (git)
  - affected: `25e5cb780e62bde432b401f312bb847edc78b432 to before 6a01b58263108eaf9869bb6f82f07709240c6589` (git)
  - affected: `25e5cb780e62bde432b401f312bb847edc78b432 to before 641ad3a30ba560f0a9a610376c568d7b75d2a2aa` (git)
  - affected: `25e5cb780e62bde432b401f312bb847edc78b432 to before 3a4aa9e6ad3e35f8e24d5eaf38ee4d437075fb36` (git)
  - affected: `f507ae6e33cbe56c4e3fe000434fc0ecc263d098` (git)
  - affected: `b1458c16f4e26e87492e58e4d24a1873bd09232a` (git)
  - affected: `5.4.36 to before 5.5` (semver)
  - affected: `5.6.8 to before 5.7` (semver)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `5.7`
  - unaffected: `before 5.7` (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: `6.12.109 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.50 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.4 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 14 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 11 Sept 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-89482](https://www.cve.org/CVERecord?id=CVE-2026-89482)
- [NVD: CVE-2026-89482](https://nvd.nist.gov/vuln/detail/CVE-2026-89482)

### References from the CNA

- <https://git.kernel.org/stable/c/32ea8ce96b9bd797c59c351ce490ffd97adaa8c0>
- <https://git.kernel.org/stable/c/dd8906bb8f8d5bf1c9f861e1382c82b87bfe7cab>
- <https://git.kernel.org/stable/c/7ed0b61bbc145988be292c4d3ec580aebd8d2bcd>
- <https://git.kernel.org/stable/c/b96e1ff75e5c0ad6e077ac002b1d30b0a2b49528>
- <https://git.kernel.org/stable/c/b36161701cb366f416afdcf70771d432a7c74753>
- <https://git.kernel.org/stable/c/6a01b58263108eaf9869bb6f82f07709240c6589>
- <https://git.kernel.org/stable/c/641ad3a30ba560f0a9a610376c568d7b75d2a2aa>
- <https://git.kernel.org/stable/c/3a4aa9e6ad3e35f8e24d5eaf38ee4d437075fb36>

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-2026-89482>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-89482/>. Everything for agents: <https://agentprime.io/llms.txt>.