Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 5.13, < 5.15.202 |
References
- https://git.kernel.org/stable/c/0004ecb798b30e90d7ebfe74efae2d9423315a64Patch
- https://git.kernel.org/stable/c/10063e1251c1485034a018236080792ad083dcc5Patch
- https://git.kernel.org/stable/c/127ccae2c185f62e6ecb4bf24f9cb307e9b9c619Patch
- https://git.kernel.org/stable/c/3880e331b0b31d0d5d3702b124f6c93539cd478aPatch
- https://git.kernel.org/stable/c/c3b7015000988ba35ecd5648f4b2283960f00543Patch
- https://git.kernel.org/stable/c/d464cf1ed900d47c85393d40b00017b6adfc2e6cPatch
- https://git.kernel.org/stable/c/fce2fd4a2ca05670a91015aacccf96a1c26268fdPatch
FAQ
What is CVE-2026-43133?
CVE-2026-43133 is a vulnerability with a CVSS score of 7.9 (HIGH). 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...
How severe is CVE-2026-43133?
CVE-2026-43133 has been rated HIGH with a CVSS base score of 7.9/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-43133?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.