CVE-2026-43133 (GCVE-0-2026-43133)
Vulnerability from cvelistv5 – Published: 2026-05-06 11:27 – Updated: 2026-05-08 12:40
VLAI?
Title
KVM: nSVM: Always use vmcb01 in VMLOAD/VMSAVE emulation
Summary
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.
Severity ?
7.9 (High)
Assigner
References
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Linux | Linux |
Affected:
cc3ed80ae69f454c3d904af9f65394a540099723 , < 10063e1251c1485034a018236080792ad083dcc5
(git)
Affected: cc3ed80ae69f454c3d904af9f65394a540099723 , < c3b7015000988ba35ecd5648f4b2283960f00543 (git) Affected: cc3ed80ae69f454c3d904af9f65394a540099723 , < 3880e331b0b31d0d5d3702b124f6c93539cd478a (git) Affected: cc3ed80ae69f454c3d904af9f65394a540099723 , < fce2fd4a2ca05670a91015aacccf96a1c26268fd (git) Affected: cc3ed80ae69f454c3d904af9f65394a540099723 , < d464cf1ed900d47c85393d40b00017b6adfc2e6c (git) Affected: cc3ed80ae69f454c3d904af9f65394a540099723 , < 0004ecb798b30e90d7ebfe74efae2d9423315a64 (git) Affected: cc3ed80ae69f454c3d904af9f65394a540099723 , < 127ccae2c185f62e6ecb4bf24f9cb307e9b9c619 (git) |
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}
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"datePublished": "2026-05-06T11:27:20.882Z",
"dateReserved": "2026-05-01T14:12:55.988Z",
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}
}
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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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