# ACPI: pfr_update: fix stack buffer overflow in query_capability()

CVE record · `CVE-2026-89587`

- **Identifiers:** `CVE-2026-89587`
- **State:** Confirmed
- **Severity:** CVSS 7.8 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, 19:44 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: `0db89fa243e5edc5de38c88b369e4c3755c5fb74 to before d3af83e327565a9444cebc0db714cb837e493046` (git)
  - affected: `0db89fa243e5edc5de38c88b369e4c3755c5fb74 to before c5a31b4e7e37c92550be9a2edf51ca853a4d251a` (git)
  - affected: `0db89fa243e5edc5de38c88b369e4c3755c5fb74 to before a2151624b55029dad0ca7efd17fb83a0461c8843` (git)
  - affected: `0db89fa243e5edc5de38c88b369e4c3755c5fb74 to before 6d4ed2fd022bc862b156e53aae163b61259e1caa` (git)
  - affected: `0db89fa243e5edc5de38c88b369e4c3755c5fb74 to before 15d2b7f38f95d28652170344f39ee492c55e567c` (git)
  - affected: `0db89fa243e5edc5de38c88b369e4c3755c5fb74 to before ced45be0073a8a31b30b4a7f68cd3a15734515de` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `5.17`
  - unaffected: `before 5.17` (semver)
  - unaffected: `6.1.188 to 6.1.*, inclusive` (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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0014, the 3rd 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-2026-89587](https://www.cve.org/CVERecord?id=CVE-2026-89587)
- [NVD: CVE-2026-89587](https://nvd.nist.gov/vuln/detail/CVE-2026-89587)

### References from the CNA

- <https://git.kernel.org/stable/c/d3af83e327565a9444cebc0db714cb837e493046>
- <https://git.kernel.org/stable/c/c5a31b4e7e37c92550be9a2edf51ca853a4d251a>
- <https://git.kernel.org/stable/c/a2151624b55029dad0ca7efd17fb83a0461c8843>
- <https://git.kernel.org/stable/c/6d4ed2fd022bc862b156e53aae163b61259e1caa>
- <https://git.kernel.org/stable/c/15d2b7f38f95d28652170344f39ee492c55e567c>
- <https://git.kernel.org/stable/c/ced45be0073a8a31b30b4a7f68cd3a15734515de>

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-2026-89587>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-89587/>. Everything for agents: <https://agentprime.io/llms.txt>.