CVE-2026-43133

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Source
https://cve.org/CVERecord?id=CVE-2026-43133
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-43133.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-43133
Downstream
Published
2026-05-06T11:27:20.882Z
Modified
2026-07-01T04:02:30.232921266Z
Severity
  • 7.9 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H CVSS Calculator
Summary
KVM: nSVM: Always use vmcb01 in VMLOAD/VMSAVE emulation
Details

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.

Database specific 
{
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43133.json"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
cc3ed80ae69f454c3d904af9f65394a540099723
Fixed
10063e1251c1485034a018236080792ad083dcc5
Fixed
c3b7015000988ba35ecd5648f4b2283960f00543
Fixed
3880e331b0b31d0d5d3702b124f6c93539cd478a
Fixed
fce2fd4a2ca05670a91015aacccf96a1c26268fd
Fixed
d464cf1ed900d47c85393d40b00017b6adfc2e6c
Fixed
0004ecb798b30e90d7ebfe74efae2d9423315a64
Fixed
127ccae2c185f62e6ecb4bf24f9cb307e9b9c619

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-43133.json"

Linux / Kernel

Package

Name
Kernel

Affected ranges

Type
ECOSYSTEM
Events
Introduced
5.13.0
Fixed
5.15.202
Type
ECOSYSTEM
Events
Introduced
5.16.0
Fixed
6.1.165
Type
ECOSYSTEM
Events
Introduced
6.2.0
Fixed
6.6.128
Type
ECOSYSTEM
Events
Introduced
6.7.0
Fixed
6.12.75
Type
ECOSYSTEM
Events
Introduced
6.13.0
Fixed
6.18.16
Type
ECOSYSTEM
Events
Introduced
6.19.0
Fixed
6.19.6

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-43133.json"