# lib/test_hmm: fail dmirror_fault() when the mirrored mm is gone

CVE record · `CVE-2026-90391`

- **Identifiers:** `CVE-2026-90391`
- **State:** Confirmed
- **Severity:** No CVSS score
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 17 Sept 2026
- **Updated:** 19 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 17 Sept 2026, 16:09 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: `b2ef9f5a5cb37643ca5def3516c546457074b882 to before 50606ced303782f8715e2d0b98ca374ea498fa29` (git)
  - affected: `b2ef9f5a5cb37643ca5def3516c546457074b882 to before 541a67f21ab807c8dbc0ea88d5a2eb73b2618090` (git)
  - affected: `b2ef9f5a5cb37643ca5def3516c546457074b882 to before d8e64ffab01e032ae29159d27230ace8cf8bdc80` (git)
  - affected: `b2ef9f5a5cb37643ca5def3516c546457074b882 to before 2636569ea7c19d9a40db4a1e8d0a027bdacf1569` (git)
  - affected: `b2ef9f5a5cb37643ca5def3516c546457074b882 to before 701347e31aa607f3782403151a3125729d685275` (git)
  - affected: `b2ef9f5a5cb37643ca5def3516c546457074b882 to before af7a6d6ec36a16a583ba2e4e9984c3cf1fe34655` (git)
  - affected: `b2ef9f5a5cb37643ca5def3516c546457074b882 to before a2074f86fc9653831e4fb7b711bb715db330f182` (git)
  - affected: `b2ef9f5a5cb37643ca5def3516c546457074b882 to before 6a8024511ddf4877435c34fb3d6028aa8e590649` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `5.8`
  - unaffected: `before 5.8` (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: `6.18.52 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.6 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:** 0.0021, the 11th 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 17 Sept 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-90391](https://www.cve.org/CVERecord?id=CVE-2026-90391)
- [NVD: CVE-2026-90391](https://nvd.nist.gov/vuln/detail/CVE-2026-90391)

### References from the CNA

- <https://git.kernel.org/stable/c/50606ced303782f8715e2d0b98ca374ea498fa29>
- <https://git.kernel.org/stable/c/541a67f21ab807c8dbc0ea88d5a2eb73b2618090>
- <https://git.kernel.org/stable/c/d8e64ffab01e032ae29159d27230ace8cf8bdc80>
- <https://git.kernel.org/stable/c/2636569ea7c19d9a40db4a1e8d0a027bdacf1569>
- <https://git.kernel.org/stable/c/701347e31aa607f3782403151a3125729d685275>
- <https://git.kernel.org/stable/c/af7a6d6ec36a16a583ba2e4e9984c3cf1fe34655>
- <https://git.kernel.org/stable/c/a2074f86fc9653831e4fb7b711bb715db330f182>
- <https://git.kernel.org/stable/c/6a8024511ddf4877435c34fb3d6028aa8e590649>

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-2026-90391>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-90391/>. Everything for agents: <https://agentprime.io/llms.txt>.