Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected cc3ed80ae69f454c3d904af9f65394a540099723 before 10063e1251c1485034a018236080792ad083dcc5; affected cc3ed80ae69f454c3d904af9f65394a540099723 before c3b7015000988ba35ecd5648f4b2283960f00543; affected cc3ed80ae69f454c3d904af9f65394a540099723 before 3880e331b0b31d0d5d3702b124f6c93539cd478a; affected cc3ed80ae69f454c3d904af9f65394a540099723 before fce2fd4a2ca05670a91015aacccf96a1c26268fd; affected cc3ed80ae69f454c3d904af9f65394a540099723 before d464cf1ed900d47c85393d40b00017b6adfc2e6c; affected cc3ed80ae69f454c3d904af9f65394a540099723 before 0004ecb798b30e90d7ebfe74efae2d9423315a64; affected cc3ed80ae69f454c3d904af9f65394a540099723 before 127ccae2c185f62e6ecb4bf24f9cb307e9b9c619 |
| Linux / Linux | affected 5.13; unaffected 0 before 5.13; unaffected 5.15.202 through 5.15.*; unaffected 6.1.165 through 6.1.*; unaffected 6.6.128 through 6.6.*; unaffected 6.12.75 through 6.12.*; unaffected 6.18.16 through 6.18.*; unaffected 6.19.6 through 6.19.*; unaffected 7.0 through * |
CWE
No CWE identifiers supplied.
References
- 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
ADP enrichment
A flaw was found in the Linux kernel's Kernel-based Virtual Machine (KVM) nSVM module. When a nested virtual machine (L2 guest) executes VMSAVE/VMLOAD instructions, and these are not intercepted by the first-level hypervisor (L1), KVM incorrectly uses `vmcb02` instead of `vmcb01` for managing guest state. This incorrect Virtual Machine Control Block (VMCB) handling could lead to unexpected behavior or state corruption within the virtualized environment.
- https://access.redhat.com/security/cve/CVE-2026-43133
- https://bugzilla.redhat.com/show_bug.cgi?id=2467065
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43133.json
- https://access.redhat.com/errata/RHSA-2026:66357
- https://access.redhat.com/errata/RHSA-2026:65334
- https://access.redhat.com/errata/RHSA-2026:66180
- https://access.redhat.com/errata/RHSA-2026:67468
- https://access.redhat.com/errata/RHSA-2026:67469
No English description supplied.
No references supplied.