# platform/x86: ISST: Add a NULL check for sst_inst\[\]

CVE record · `CVE-2026-89439`

- **Identifiers:** `CVE-2026-89439`
- **State:** Confirmed
- **Severity:** No CVSS score
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 11 Sept 2026
- **Updated:** 21 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: `d805456c712f93ba8a012430f2a93bec133b6ff4 to before f7c9370dd1d3cedb80c635528271cab1d0bcb103` (git)
  - affected: `d805456c712f93ba8a012430f2a93bec133b6ff4 to before 49a95fe1f64f41c2e8959e525aefdb10f23b293e` (git)
  - affected: `d805456c712f93ba8a012430f2a93bec133b6ff4 to before c280fcd53b938b70c7dee9ce1a66b32bd6e5ebaa` (git)
  - affected: `d805456c712f93ba8a012430f2a93bec133b6ff4 to before ef7975af15126dd70ace519da7bb33f2848b9064` (git)
  - affected: `d805456c712f93ba8a012430f2a93bec133b6ff4 to before 3de2776e9d7073765c10c2326c2bda5926811ea6` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `6.4`
  - unaffected: `before 6.4` (semver)
  - unaffected: `6.6.160 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

No source has published a CVSS score for this record yet.

- **CISA KEV:** Not listed.
- **EPSS:** 0.0021, the 10th 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-2026-89439](https://www.cve.org/CVERecord?id=CVE-2026-89439)
- [NVD: CVE-2026-89439](https://nvd.nist.gov/vuln/detail/CVE-2026-89439)

### References from the CNA

- <https://git.kernel.org/stable/c/f7c9370dd1d3cedb80c635528271cab1d0bcb103>
- <https://git.kernel.org/stable/c/49a95fe1f64f41c2e8959e525aefdb10f23b293e>
- <https://git.kernel.org/stable/c/c280fcd53b938b70c7dee9ce1a66b32bd6e5ebaa>
- <https://git.kernel.org/stable/c/ef7975af15126dd70ace519da7bb33f2848b9064>
- <https://git.kernel.org/stable/c/3de2776e9d7073765c10c2326c2bda5926811ea6>

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-2026-89439>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-89439/>. Everything for agents: <https://agentprime.io/llms.txt>.