# bpf, x86: Fix per-CPU address resolution into an extended register

CVE record · `CVE-2026-89581`

- **Identifiers:** `CVE-2026-89581`
- **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: `7bdbf7446305cb65c510c16d57cde82bc76b234a to before 638bc3aada8ecdece184d5c15b100d489c9cccd7` (git)
  - affected: `7bdbf7446305cb65c510c16d57cde82bc76b234a to before 6886642414f59f928728802dc2c972a9859e6310` (git)
  - affected: `7bdbf7446305cb65c510c16d57cde82bc76b234a to before 6a19b18d458881bf3269a357cc6dc6db5eef4369` (git)
  - affected: `7bdbf7446305cb65c510c16d57cde82bc76b234a to before 5bbbce02e500d47d8e259a45be5a7be9741d0533` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `6.10`
  - unaffected: `before 6.10` (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:** 0.0013, the 2nd 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-2026-89581](https://www.cve.org/CVERecord?id=CVE-2026-89581)
- [NVD: CVE-2026-89581](https://nvd.nist.gov/vuln/detail/CVE-2026-89581)

### References from the CNA

- <https://git.kernel.org/stable/c/638bc3aada8ecdece184d5c15b100d489c9cccd7>
- <https://git.kernel.org/stable/c/6886642414f59f928728802dc2c972a9859e6310>
- <https://git.kernel.org/stable/c/6a19b18d458881bf3269a357cc6dc6db5eef4369>
- <https://git.kernel.org/stable/c/5bbbce02e500d47d8e259a45be5a7be9741d0533>

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-2026-89581>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-89581/>. Everything for agents: <https://agentprime.io/llms.txt>.