CVE-2026-43133
KVM: nSVM: Always use vmcb01 in VMLOAD/VMSAVE emulation
- Published
- Updated
- Reserved
- Assigned by
- Linux
Description
In the Linux kernel, the following vulnerability has been resolved: KVM: nSVM: Always use vmcb01 in VMLOAD/VMSAVE emulation Commit cc3ed80ae69f ("KVM: nSVM: always use vmcb01 to for vmsave/vmload of guest state") made KVM always use vmcb01 for the fields controlled by VMSAVE/VMLOAD, but it missed updating the VMLOAD/VMSAVE emulation code to always use vmcb01. As a result, if VMSAVE/VMLOAD is executed by an L2 guest and is not intercepted by L1, KVM will mistakenly use vmcb02. Always use vmcb01 instead of the current VMCB.
Timeline
ID reserved
By Linux
- 5 days later
· 5 days later
Published
- 6 months later
· 6 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.9 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H |
| redhat-SADPADP (enrichment) | 3.1 | High7.9 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H |
| NVDNVD · Modified | 3.1 | High7.9 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H |
- EPSS (exploitation in 30 days)
- 0.13% · top 97% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.9.
Weakness
Affected products
- affected cc3ed80ae69f454c3d904af9f65394a540099723 – < 10063e1251c1485034a018236080792ad083dcc5
- affected cc3ed80ae69f454c3d904af9f65394a540099723 – < c3b7015000988ba35ecd5648f4b2283960f00543
- affected cc3ed80ae69f454c3d904af9f65394a540099723 – < 3880e331b0b31d0d5d3702b124f6c93539cd478a
- affected cc3ed80ae69f454c3d904af9f65394a540099723 – < fce2fd4a2ca05670a91015aacccf96a1c26268fd
- affected cc3ed80ae69f454c3d904af9f65394a540099723 – < d464cf1ed900d47c85393d40b00017b6adfc2e6c
- affected cc3ed80ae69f454c3d904af9f65394a540099723 – < 0004ecb798b30e90d7ebfe74efae2d9423315a64
- affected cc3ed80ae69f454c3d904af9f65394a540099723 – < 127ccae2c185f62e6ecb4bf24f9cb307e9b9c619
- affected 5.13
- unaffected < 5.13
- unaffected 5.15.202 – ≤ 5.15.*
- unaffected 6.1.165 – ≤ 6.1.*
- unaffected 6.6.128 – ≤ 6.6.*
- unaffected 6.12.75 – ≤ 6.12.*
- unaffected 6.18.16 – ≤ 6.18.*
- unaffected 6.19.6 – ≤ 6.19.*
- unaffected 7.0 – ≤ *
References (15)
- https://git.kernel.org/stable/c/10063e1251c1485034a018236080792ad083dcc5 (opens in a new tab)
- https://git.kernel.org/stable/c/c3b7015000988ba35ecd5648f4b2283960f00543 (opens in a new tab)
- https://git.kernel.org/stable/c/3880e331b0b31d0d5d3702b124f6c93539cd478a (opens in a new tab)
- https://git.kernel.org/stable/c/fce2fd4a2ca05670a91015aacccf96a1c26268fd (opens in a new tab)
- https://git.kernel.org/stable/c/d464cf1ed900d47c85393d40b00017b6adfc2e6c (opens in a new tab)
- https://git.kernel.org/stable/c/0004ecb798b30e90d7ebfe74efae2d9423315a64 (opens in a new tab)
- https://git.kernel.org/stable/c/127ccae2c185f62e6ecb4bf24f9cb307e9b9c619 (opens in a new tab)
- https://access.redhat.com/security/cve/CVE-2026-43133 (opens in a new tab)vdb-entryx_refsource_REDHAT
- RHBZ#2467065 (opens in a new tab)issue-trackingx_refsource_REDHAT
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43133.json (opens in a new tab)x_sadp-csaf-vex
- https://access.redhat.com/errata/RHSA-2026:66357 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:65334 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:66180 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:67468 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:67469 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-43133)Record last updated .