# KVM: x86: Use active memslots for the per-vCPU MMIO cache

CVE record · `CVE-2026-99082`

- **Identifiers:** `CVE-2026-99082`
- **State:** Confirmed
- **Severity:** CVSS 8.8 High
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 23 Oct 2026
- **Updated:** 30 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 23 Oct 2026, 12:45 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: `699023e239658e62da6f42f47d31b54788521ec1 to before 485a5286675b15b00ee850d90eaa178cc588445f` (git)
  - affected: `699023e239658e62da6f42f47d31b54788521ec1 to before 445e3369ac8cc1b18aedc8e8f977c68a0a326fa9` (git)
  - affected: `699023e239658e62da6f42f47d31b54788521ec1 to before 1c77d33d85786d36e56ca1b580fb55347fd65b47` (git)
  - affected: `699023e239658e62da6f42f47d31b54788521ec1 to before a63f79d9da9468952396af73e1e53330845cf876` (git)
  - affected: `699023e239658e62da6f42f47d31b54788521ec1 to before 7fd4e64f4bbc8c35ae8f0d2a1fb5b77a76d5b4fd` (git)
  - affected: `699023e239658e62da6f42f47d31b54788521ec1 to before 2566780c684c9c21241d409d790087c73070f312` (git)
  - affected: `699023e239658e62da6f42f47d31b54788521ec1 to before e792a9ace39d2812a5b342a1987186c7bc653204` (git)
  - affected: `699023e239658e62da6f42f47d31b54788521ec1 to before b3e6212dea2e4328a841ceb37f377583176dc735` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `4.2`
  - unaffected: `before 4.2` (semver)
  - unaffected: `5.10.273 to 5.10.*, inclusive` (semver)
  - unaffected: `5.15.224 to 5.15.*, inclusive` (semver)
  - unaffected: `6.1.191 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.160 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.114 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.58 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.12 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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0016, the 4th percentile, on 5 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 23 Oct 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-99082](https://www.cve.org/CVERecord?id=CVE-2026-99082)
- [NVD: CVE-2026-99082](https://nvd.nist.gov/vuln/detail/CVE-2026-99082)

### References from the CNA

- <https://git.kernel.org/stable/c/485a5286675b15b00ee850d90eaa178cc588445f>
- <https://git.kernel.org/stable/c/445e3369ac8cc1b18aedc8e8f977c68a0a326fa9>
- <https://git.kernel.org/stable/c/1c77d33d85786d36e56ca1b580fb55347fd65b47>
- <https://git.kernel.org/stable/c/a63f79d9da9468952396af73e1e53330845cf876>
- <https://git.kernel.org/stable/c/7fd4e64f4bbc8c35ae8f0d2a1fb5b77a76d5b4fd>
- <https://git.kernel.org/stable/c/2566780c684c9c21241d409d790087c73070f312>
- <https://git.kernel.org/stable/c/e792a9ace39d2812a5b342a1987186c7bc653204>
- <https://git.kernel.org/stable/c/b3e6212dea2e4328a841ceb37f377583176dc735>

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-2026-99082>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-99082/>. Everything for agents: <https://agentprime.io/llms.txt>.