# fs/ntfs3: validate ef->size covers the record's name and value

CVE record · `CVE-2026-89779`

- **Identifiers:** `CVE-2026-89779`
- **State:** Confirmed
- **Severity:** CVSS 9.1 Critical
- **Critical:** Yes: CVSS 9+
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 16 Sept 2026
- **Updated:** 19 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 16 Sept 2026, 08:48 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 9.1: 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: `333feb7ba84f69f9b423422417aaac54fd9e7c84 to before b27e68ad818a4ca2cef8f35f97e75d756714c818` (git)
  - affected: `000a9a72efa4a9df289bab9c9e8ba1639c72e0d6 to before 28a924c7e67e6d71abeb04860b61166fecb027fc` (git)
  - affected: `0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b to before d585ed08308909c7e6fefb4e8a258aeb29b19ff9` (git)
  - affected: `0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b to before 077df8464cf24f8ffc82fb6efec2ae600686e699` (git)
  - affected: `0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b to before aab1880058ac767d3ea9388a9a7221c776c22c44` (git)
  - affected: `0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b to before c8a109c9e23a2c7fd548473dde728b2cb8188146` (git)
  - affected: `0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b to before c22f91d82cb9a29d22bdffdce6c803467984ad0c` (git)
  - affected: `5.15.121 to before 5.15.221` (semver)
  - affected: `6.1.40 to before 6.1.188` (semver)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `6.2`
  - unaffected: `before 6.2` (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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0070, the 53rd 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 16 Sept 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-89779](https://www.cve.org/CVERecord?id=CVE-2026-89779)
- [NVD: CVE-2026-89779](https://nvd.nist.gov/vuln/detail/CVE-2026-89779)

### References from the CNA

- <https://git.kernel.org/stable/c/b27e68ad818a4ca2cef8f35f97e75d756714c818>
- <https://git.kernel.org/stable/c/28a924c7e67e6d71abeb04860b61166fecb027fc>
- <https://git.kernel.org/stable/c/d585ed08308909c7e6fefb4e8a258aeb29b19ff9>
- <https://git.kernel.org/stable/c/077df8464cf24f8ffc82fb6efec2ae600686e699>
- <https://git.kernel.org/stable/c/aab1880058ac767d3ea9388a9a7221c776c22c44>
- <https://git.kernel.org/stable/c/c8a109c9e23a2c7fd548473dde728b2cb8188146>
- <https://git.kernel.org/stable/c/c22f91d82cb9a29d22bdffdce6c803467984ad0c>

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-2026-89779>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-89779/>. Everything for agents: <https://agentprime.io/llms.txt>.