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Vulnerability record · CVE-2026-43133 · published 6 May 2026

CVE-2026-43133: Linux kernel vulnerability

Linux · Linux Kernel

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.

7.9 CVSS 3.1 High EPSS 0.18% · top 93.7% CWE-628 · CWE-628
7.9CVSS 3.1 base score
0.18%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
15References
15 Sep 2026Last modified by NVD

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:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/0004ecb798b30e90d7ebfe74efae2d9423315a64 Patch
https://git.kernel.org/stable/c/10063e1251c1485034a018236080792ad083dcc5 Patch
https://git.kernel.org/stable/c/127ccae2c185f62e6ecb4bf24f9cb307e9b9c619 Patch
https://git.kernel.org/stable/c/3880e331b0b31d0d5d3702b124f6c93539cd478a Patch
https://git.kernel.org/stable/c/c3b7015000988ba35ecd5648f4b2283960f00543 Patch
https://git.kernel.org/stable/c/d464cf1ed900d47c85393d40b00017b6adfc2e6c Patch
https://git.kernel.org/stable/c/fce2fd4a2ca05670a91015aacccf96a1c26268fd Patch
https://access.redhat.com/errata/RHSA-2026:65334
https://access.redhat.com/errata/RHSA-2026:66180
https://access.redhat.com/errata/RHSA-2026:66357
https://access.redhat.com/errata/RHSA-2026:67468
https://access.redhat.com/errata/RHSA-2026:67469
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

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Source: NIST National Vulnerability Database (record CVE-2026-43133), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.