CVE-2026-43133

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.

References

• https://git.kernel.org/stable/c/0004ecb798b30e90d7ebfe74efae2d9423315a64
• https://git.kernel.org/stable/c/10063e1251c1485034a018236080792ad083dcc5
• https://git.kernel.org/stable/c/127ccae2c185f62e6ecb4bf24f9cb307e9b9c619
• https://git.kernel.org/stable/c/3880e331b0b31d0d5d3702b124f6c93539cd478a
• https://git.kernel.org/stable/c/c3b7015000988ba35ecd5648f4b2283960f00543