# platform/x86: ISST: Validate level in perf mask ioctls

CVE record · `CVE-2026-89443`

- **Identifiers:** `CVE-2026-89443`
- **State:** Confirmed
- **Severity:** CVSS 7.1 High
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 11 Sept 2026
- **Updated:** 19 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 11 Sept 2026, 19:43 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: `ea009e4769fa3bd05d4c111c3b6865eb3a9be829 to before beb22ebf76c0415f22d2d0c3f1ff0627e7ae4a68` (git)
  - affected: `ea009e4769fa3bd05d4c111c3b6865eb3a9be829 to before 1a8bab5ceee1a42a78de12d3d69f67516a20588e` (git)
  - affected: `ea009e4769fa3bd05d4c111c3b6865eb3a9be829 to before 1889a9156553f0692acd57caf15e877baace1a01` (git)
  - affected: `ea009e4769fa3bd05d4c111c3b6865eb3a9be829 to before d19385624bdfb577db9c94bb8879992fd5e17bcd` (git)
  - affected: `ea009e4769fa3bd05d4c111c3b6865eb3a9be829 to before 80e0d353c86a9a168ad6d213f494796294381538` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `6.4`
  - unaffected: `before 6.4` (semver)
  - unaffected: `6.6.157 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.109 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.50 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.4 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:L/UI:N/S:U/C:H/I:N/A:H`, from CNA (Linux)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0016, the 5th 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 11 Sept 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-89443](https://www.cve.org/CVERecord?id=CVE-2026-89443)
- [NVD: CVE-2026-89443](https://nvd.nist.gov/vuln/detail/CVE-2026-89443)

### References from the CNA

- <https://git.kernel.org/stable/c/beb22ebf76c0415f22d2d0c3f1ff0627e7ae4a68>
- <https://git.kernel.org/stable/c/1a8bab5ceee1a42a78de12d3d69f67516a20588e>
- <https://git.kernel.org/stable/c/1889a9156553f0692acd57caf15e877baace1a01>
- <https://git.kernel.org/stable/c/d19385624bdfb577db9c94bb8879992fd5e17bcd>
- <https://git.kernel.org/stable/c/80e0d353c86a9a168ad6d213f494796294381538>

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-2026-89443>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-89443/>. Everything for agents: <https://agentprime.io/llms.txt>.