# exfat: fix valid_size extension over a shared writable mapping

CVE record · `CVE-2026-92487`

- **Identifiers:** `CVE-2026-92487`
- **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, 16:10 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: `82a81a7352bcf5f2756ac33d47ee0582737e9a85 to before 24f20986b253c3e4eb13ebe3c2007d1d352408a6` (git)
  - affected: `82a81a7352bcf5f2756ac33d47ee0582737e9a85 to before 1135704ed22f54873eb0498a232611d9eca30dd4` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `7.2`
  - unaffected: `before 7.2` (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:** 0.0020, the 9th 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-2026-92487](https://www.cve.org/CVERecord?id=CVE-2026-92487)
- [NVD: CVE-2026-92487](https://nvd.nist.gov/vuln/detail/CVE-2026-92487)

### References from the CNA

- <https://git.kernel.org/stable/c/24f20986b253c3e4eb13ebe3c2007d1d352408a6>
- <https://git.kernel.org/stable/c/1135704ed22f54873eb0498a232611d9eca30dd4>

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-2026-92487>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-92487/>. Everything for agents: <https://agentprime.io/llms.txt>.