CVE-2026-43133KVM: nSVM: Always use vmcb01 in VMLOAD/VMSAVE emulation
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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
- 7.9 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H
- Weakness (CWE)
- CWE-628
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from cc3ed80ae69f454c3d904af9f65394a540099723 before 10063e1251c1485034a018236080792ad083dcc5; from cc3ed80ae69f454c3d904af9f65394a540099723 before c3b7015000988ba35ecd5648f4b2283960f00543; from cc3ed80ae69f454c3d904af9f65394a540099723 before 3880e331b0b31d0d5d3702b124f6c93539cd478a; from cc3ed80ae69f454c3d904af9f65394a540099723 before fce2fd4a2ca05670a91015aacccf96a1c26268fd; from cc3ed80ae69f454c3d904af9f65394a540099723 before d464cf1ed900d47c85393d40b00017b6adfc2e6c; from cc3ed80ae69f454c3d904af9f65394a540099723 before 0004ecb798b30e90d7ebfe74efae2d9423315a64; from cc3ed80ae69f454c3d904af9f65394a540099723 before 127ccae2c185f62e6ecb4bf24f9cb307e9b9c619 | CNA record |
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux | from 0:6.12.0-211.53.1.el10_2 not affected | CISA ADP |
Red Hat Red Hat OpenShift Container Platform 4 redhat:openshift | 4 | CISA ADP |
linux linux_kernel linux:linux_kernel | from 5.13 before 5.15.202; from 5.16 before 6.1.165; from 6.2 before 6.6.128; from 6.7 before 6.12.75; from 6.13 before 6.18.16; from 6.19 before 6.19.6 | NVD |
References
- https://git.kernel.org/stable/c/10063e1251c1485034a018236080792ad083dcc5patch
- https://git.kernel.org/stable/c/c3b7015000988ba35ecd5648f4b2283960f00543patch
- https://git.kernel.org/stable/c/3880e331b0b31d0d5d3702b124f6c93539cd478apatch
- https://git.kernel.org/stable/c/fce2fd4a2ca05670a91015aacccf96a1c26268fdpatch
- https://git.kernel.org/stable/c/d464cf1ed900d47c85393d40b00017b6adfc2e6cpatch
- https://git.kernel.org/stable/c/0004ecb798b30e90d7ebfe74efae2d9423315a64patch
- https://git.kernel.org/stable/c/127ccae2c185f62e6ecb4bf24f9cb307e9b9c619patch
- 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
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.