# KVM: nSVM: Always use vmcb01 in VMLOAD/VMSAVE emulation

CVE record · `CVE-2026-43133`

- **Identifiers:** `CVE-2026-43133`
- **State:** Confirmed
- **Severity:** CVSS 7.9 High
- **Critical:** No
- **CNA:** Linux
- **Weakness (CWE):** [CWE-628](https://cwe.mitre.org/data/definitions/628.html) · [CWE-754](https://cwe.mitre.org/data/definitions/754.html)
- **Tags:** [CWE-628](https://agentprime.io/advisories/tag/cwe-628.md) · [CWE-754](https://agentprime.io/advisories/tag/cwe-754.md)
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 6 May 2026
- **Updated:** 19 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 6 May 2026, 11:27 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: `cc3ed80ae69f454c3d904af9f65394a540099723 to before 10063e1251c1485034a018236080792ad083dcc5` (git)
  - affected: `cc3ed80ae69f454c3d904af9f65394a540099723 to before c3b7015000988ba35ecd5648f4b2283960f00543` (git)
  - affected: `cc3ed80ae69f454c3d904af9f65394a540099723 to before 3880e331b0b31d0d5d3702b124f6c93539cd478a` (git)
  - affected: `cc3ed80ae69f454c3d904af9f65394a540099723 to before fce2fd4a2ca05670a91015aacccf96a1c26268fd` (git)
  - affected: `cc3ed80ae69f454c3d904af9f65394a540099723 to before d464cf1ed900d47c85393d40b00017b6adfc2e6c` (git)
  - affected: `cc3ed80ae69f454c3d904af9f65394a540099723 to before 0004ecb798b30e90d7ebfe74efae2d9423315a64` (git)
  - affected: `cc3ed80ae69f454c3d904af9f65394a540099723 to before 127ccae2c185f62e6ecb4bf24f9cb307e9b9c619` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `5.13`
  - unaffected: `before 5.13` (semver)
  - unaffected: `5.15.202 to 5.15.*, inclusive` (semver)
  - unaffected: `6.1.165 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.128 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.75 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.16 to 6.18.*, inclusive` (semver)
  - unaffected: `6.19.6 to 6.19.*, inclusive` (semver)
  - unaffected: `7.0 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

- 7.9 High, CVSS 3.1: `CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H`, from CNA (Linux) (used for this record)
- 7.9 High, CVSS 3.1: `CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H`, from ADP (redhat-SADP)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0013, the 2nd 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 6 May 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-43133](https://www.cve.org/CVERecord?id=CVE-2026-43133)
- [NVD: CVE-2026-43133](https://nvd.nist.gov/vuln/detail/CVE-2026-43133)

### References from the CNA

- <https://git.kernel.org/stable/c/10063e1251c1485034a018236080792ad083dcc5>
- <https://git.kernel.org/stable/c/c3b7015000988ba35ecd5648f4b2283960f00543>
- <https://git.kernel.org/stable/c/3880e331b0b31d0d5d3702b124f6c93539cd478a>
- <https://git.kernel.org/stable/c/fce2fd4a2ca05670a91015aacccf96a1c26268fd>
- <https://git.kernel.org/stable/c/d464cf1ed900d47c85393d40b00017b6adfc2e6c>
- <https://git.kernel.org/stable/c/0004ecb798b30e90d7ebfe74efae2d9423315a64>
- <https://git.kernel.org/stable/c/127ccae2c185f62e6ecb4bf24f9cb307e9b9c619>

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-2026-43133>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

---

The web page: <https://agentprime.io/advisories/CVE-2026-43133/>. Everything for agents: <https://agentprime.io/llms.txt>.