# x86/kvm: Don't consume async #PF flags on a kernel #PF in NMI context

CVE record · `CVE-2026-99178`

- **Identifiers:** `CVE-2026-99178`
- **State:** Confirmed
- **Severity:** No CVSS score
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 28 Oct 2026
- **Updated:** 1 Nov 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 28 Oct 2026, 10:35 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: `631bc4878220932fe67fc46fc7cf7cccdb1ec597 to before fd60b32a99627fda479c9fa1d4a82fa9f7994670` (git)
  - affected: `631bc4878220932fe67fc46fc7cf7cccdb1ec597 to before b77e9622bbade9812e2090c66d25c372f515e921` (git)
  - affected: `631bc4878220932fe67fc46fc7cf7cccdb1ec597 to before f45ee1ff6358a22d7e22a4c53cb3148ea97b10d9` (git)
  - affected: `631bc4878220932fe67fc46fc7cf7cccdb1ec597 to before 81d99abe2bd81379abfb595e403bbbee6fbfc624` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `2.6.38`
  - unaffected: `before 2.6.38` (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:** 0.0017, the 6th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 28 Oct 2026, 10:35 UTC: [Confirmed by the CVE List](https://www.cve.org/CVERecord?id=CVE-2026-99178)
- 28 Oct 2026, 11:17 UTC: [Confirmed by NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-99178)

## Sources

- [CVE List: CVE-2026-99178](https://www.cve.org/CVERecord?id=CVE-2026-99178)
- [NVD: CVE-2026-99178](https://nvd.nist.gov/vuln/detail/CVE-2026-99178)

### References from the CNA

- <https://git.kernel.org/stable/c/fd60b32a99627fda479c9fa1d4a82fa9f7994670>
- <https://git.kernel.org/stable/c/b77e9622bbade9812e2090c66d25c372f515e921>
- <https://git.kernel.org/stable/c/f45ee1ff6358a22d7e22a4c53cb3148ea97b10d9>
- <https://git.kernel.org/stable/c/81d99abe2bd81379abfb595e403bbbee6fbfc624>

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-2026-99178>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-99178/>. Everything for agents: <https://agentprime.io/llms.txt>.