# x86/hyperv: Avoid using per-cpu output page in hv_apicid_to_vp_index()

CVE record · `CVE-2026-99258`

- **Identifiers:** `CVE-2026-99258`
- **State:** Confirmed
- **Severity:** No CVSS score
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 3 Nov 2026
- **Updated:** 3 Nov 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 3 Nov 2026, 11:25 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: `3d12349ade541eefde0e71bf5c4aa7aa04c52a79 to before bdba5f1b8bd0d18b1df61f769b559ed272902489` (git)
  - affected: `86c48271e0d60c82665e9fd61277002391efcef7 to before 2b561786c9076a892ef8b8f416c9828bc87ed44f` (git)
  - affected: `86c48271e0d60c82665e9fd61277002391efcef7 to before bc8ca0f4769627ae7d04e7ffdbd20de4f27a9bf9` (git)
  - affected: `86c48271e0d60c82665e9fd61277002391efcef7 to before 7b74c117e2aac78e0f723e1c9c3644451c56b0d9` (git)
  - affected: `cb002d6c8f06d6061e84b2109cb84416107a9fb9` (git)
  - affected: `6.12.41 to before 6.12.115` (semver)
  - affected: `6.15.3 to before 6.16` (semver)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `6.16`
  - unaffected: `before 6.16` (semver)
  - unaffected: `6.12.115 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.59 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.13 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:** 0.0019, the 8th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 3 Nov 2026, 11:25 UTC: [Confirmed by the CVE List](https://www.cve.org/CVERecord?id=CVE-2026-99258)
- 3 Nov 2026, 11:27 UTC: First seen by agentprime
- 3 Nov 2026, 12:17 UTC: [Confirmed by NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-99258)

## Sources

- [CVE List: CVE-2026-99258](https://www.cve.org/CVERecord?id=CVE-2026-99258)
- [NVD: CVE-2026-99258](https://nvd.nist.gov/vuln/detail/CVE-2026-99258)

### References from the CNA

- <https://git.kernel.org/stable/c/bdba5f1b8bd0d18b1df61f769b559ed272902489>
- <https://git.kernel.org/stable/c/2b561786c9076a892ef8b8f416c9828bc87ed44f>
- <https://git.kernel.org/stable/c/bc8ca0f4769627ae7d04e7ffdbd20de4f27a9bf9>
- <https://git.kernel.org/stable/c/7b74c117e2aac78e0f723e1c9c3644451c56b0d9>

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-2026-99258>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

---

The web page: <https://agentprime.io/advisories/CVE-2026-99258/>. Everything for agents: <https://agentprime.io/llms.txt>.