# nilfs2: prevent out-of-bounds read in super root block parsing

CVE record · `CVE-2026-90419`

- **Identifiers:** `CVE-2026-90419`
- **State:** Confirmed
- **Severity:** CVSS 7.1 High
- **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: `8a9d2191e9f43bbcd256a9a6871bd73434c83f2f to before 16df2520502867a4f34e202b89d01243d59bb8b5` (git)
  - affected: `8a9d2191e9f43bbcd256a9a6871bd73434c83f2f to before dcc85fc28f884038735464f6f104dda9c7dbfad6` (git)
  - affected: `8a9d2191e9f43bbcd256a9a6871bd73434c83f2f to before 5b69ebe20d7f944c1f45177dca0c11474ac277cc` (git)
  - affected: `8a9d2191e9f43bbcd256a9a6871bd73434c83f2f to before 7029e70cf86d5c54c0a2812479b0bee2cabcbaaa` (git)
  - affected: `8a9d2191e9f43bbcd256a9a6871bd73434c83f2f to before 71bd64471ff583101b4a33dfc838ce29aef57960` (git)
  - affected: `8a9d2191e9f43bbcd256a9a6871bd73434c83f2f to before 842397fdfd2e61d6470166c796f3125b6c27a162` (git)
  - affected: `8a9d2191e9f43bbcd256a9a6871bd73434c83f2f to before 15c8559376416a84c3d8402fd8d0c89bb323d05f` (git)
  - affected: `8a9d2191e9f43bbcd256a9a6871bd73434c83f2f to before 7cb2f76a6a2ba2130b577cb8ac13e1e46c4fc689` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `2.6.30`
  - unaffected: `before 2.6.30` (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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0018, the 7th 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-2026-90419](https://www.cve.org/CVERecord?id=CVE-2026-90419)
- [NVD: CVE-2026-90419](https://nvd.nist.gov/vuln/detail/CVE-2026-90419)

### References from the CNA

- <https://git.kernel.org/stable/c/16df2520502867a4f34e202b89d01243d59bb8b5>
- <https://git.kernel.org/stable/c/dcc85fc28f884038735464f6f104dda9c7dbfad6>
- <https://git.kernel.org/stable/c/5b69ebe20d7f944c1f45177dca0c11474ac277cc>
- <https://git.kernel.org/stable/c/7029e70cf86d5c54c0a2812479b0bee2cabcbaaa>
- <https://git.kernel.org/stable/c/71bd64471ff583101b4a33dfc838ce29aef57960>
- <https://git.kernel.org/stable/c/842397fdfd2e61d6470166c796f3125b6c27a162>
- <https://git.kernel.org/stable/c/15c8559376416a84c3d8402fd8d0c89bb323d05f>
- <https://git.kernel.org/stable/c/7cb2f76a6a2ba2130b577cb8ac13e1e46c4fc689>

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-2026-90419>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-90419/>. Everything for agents: <https://agentprime.io/llms.txt>.