KVM: nSVM: Always use vmcb01 in VMLOAD/VMSAVE emulation
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.
CVE-2026-43133
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-43133
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "cc3ed80ae69f454c3d904af9f65394a540099723",
"lessThan": "10063e1251c1485034a018236080792ad083dcc5",
"versionType": "git"
},
{
"status": "affected",
"version": "cc3ed80ae69f454c3d904af9f65394a540099723",
"lessThan": "c3b7015000988ba35ecd5648f4b2283960f00543",
"versionType": "git"
},
{
"status": "affected",
"version": "cc3ed80ae69f454c3d904af9f65394a540099723",
"lessThan": "3880e331b0b31d0d5d3702b124f6c93539cd478a",
"versionType": "git"
},
{
"status": "affected",
"version": "cc3ed80ae69f454c3d904af9f65394a540099723",
"lessThan": "fce2fd4a2ca05670a91015aacccf96a1c26268fd",
"versionType": "git"
},
{
"status": "affected",
"version": "cc3ed80ae69f454c3d904af9f65394a540099723",
"lessThan": "d464cf1ed900d47c85393d40b00017b6adfc2e6c",
"versionType": "git"
},
{
"status": "affected",
"version": "cc3ed80ae69f454c3d904af9f65394a540099723",
"lessThan": "0004ecb798b30e90d7ebfe74efae2d9423315a64",
"versionType": "git"
},
{
"status": "affected",
"version": "cc3ed80ae69f454c3d904af9f65394a540099723",
"lessThan": "127ccae2c185f62e6ecb4bf24f9cb307e9b9c619",
"versionType": "git"
}
],
"programFiles": [
"arch/x86/kvm/svm/svm.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.13"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.13",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.15.202",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.165",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.128",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.75",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.16",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19.6",
"versionType": "semver",
"lessThanOrEqual": "6.19.*"
},
{
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"arch/x86/kvm/svm/svm.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-43133
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #40032 · Revision 1
- Added to Heist Feed
- Publisher date