# fuse: check for NULL root inode in fuse_fill_super_submount

CVE record · `CVE-2026-90139`

- **Identifiers:** `CVE-2026-90139`
- **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:** 30 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 17 Sept 2026, 16:06 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: `1866d779d5d2abae59d304e809600ca3ca8d0071 to before 4844aeb0de5fb0de4f7c9aaf2bf05cb8cffe60d5` (git)
  - affected: `1866d779d5d2abae59d304e809600ca3ca8d0071 to before 17120c5bfb16808509ea18d7fab6027802d93eba` (git)
  - affected: `1866d779d5d2abae59d304e809600ca3ca8d0071 to before e0b7f2922f6bd4c23cbddb7d1fc2bada570d27d1` (git)
  - affected: `1866d779d5d2abae59d304e809600ca3ca8d0071 to before a5129155ca9fba40d77ff19ffead8244e88d6f9c` (git)
  - affected: `1866d779d5d2abae59d304e809600ca3ca8d0071 to before 509f4a09bae7f03c87f67f053648874a5e177867` (git)
  - affected: `1866d779d5d2abae59d304e809600ca3ca8d0071 to before 928f659a3e3650978a5b4829cc982324f72b474b` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `5.10`
  - unaffected: `before 5.10` (semver)
  - unaffected: `6.1.191 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-2026-90139](https://www.cve.org/CVERecord?id=CVE-2026-90139)
- [NVD: CVE-2026-90139](https://nvd.nist.gov/vuln/detail/CVE-2026-90139)

### References from the CNA

- <https://git.kernel.org/stable/c/4844aeb0de5fb0de4f7c9aaf2bf05cb8cffe60d5>
- <https://git.kernel.org/stable/c/17120c5bfb16808509ea18d7fab6027802d93eba>
- <https://git.kernel.org/stable/c/e0b7f2922f6bd4c23cbddb7d1fc2bada570d27d1>
- <https://git.kernel.org/stable/c/a5129155ca9fba40d77ff19ffead8244e88d6f9c>
- <https://git.kernel.org/stable/c/509f4a09bae7f03c87f67f053648874a5e177867>
- <https://git.kernel.org/stable/c/928f659a3e3650978a5b4829cc982324f72b474b>

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-2026-90139>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-90139/>. Everything for agents: <https://agentprime.io/llms.txt>.