KVM: nSVM: Triple fault if restore host CR3 fails on nested #VMEXIT
In the Linux kernel, the following vulnerability has been resolved: KVM: nSVM: Triple fault if restore host CR3 fails on nested #VMEXIT If loading L1's CR3 fails on a nested #VMEXIT, nested_svm_vmexit() returns an error code that is ignored by most callers, and continues to run L1 with corrupted state. A sane recovery is not possible in this case, and HW behavior is to cause a shutdown. Inject a triple fault instead, and do not return early from nested_svm_vmexit(). Continue cleaning up the vCPU state (e.g. clear pending exceptions), to handle the failure as gracefully as possible. From the APM: Upon #VMEXIT, the processor performs the following actions in order to return to the host execution context: ... if (illegal host state loaded, or exception while loading host state) shutdown else execute first host instruction following the VMRUN Remove the return value of nested_svm_vmexit(), which is mostly unchecked anyway.
CVE-2026-46032
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-2026-46032
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": "d82aaef9c88aa27bce63751d6d6329920b1fe8da",
"lessThan": "2e661773890e6ba6b16064fad961da3dd311be43",
"versionType": "git"
},
{
"status": "affected",
"version": "d82aaef9c88aa27bce63751d6d6329920b1fe8da",
"lessThan": "af79992ecdb6817970d757fb5d853b8d9b55a0d6",
"versionType": "git"
},
{
"status": "affected",
"version": "d82aaef9c88aa27bce63751d6d6329920b1fe8da",
"lessThan": "b0eb0a8959ac2b808eb11548d002fe1f9b5650cc",
"versionType": "git"
},
{
"status": "affected",
"version": "d82aaef9c88aa27bce63751d6d6329920b1fe8da",
"lessThan": "9a738cf170a4a2332ea3a15e23ec65b5757fe4a1",
"versionType": "git"
},
{
"status": "affected",
"version": "d82aaef9c88aa27bce63751d6d6329920b1fe8da",
"lessThan": "5d291ef0585ed880ed4dd71ea1a5965e0a65fb53",
"versionType": "git"
}
],
"programFiles": [
"arch/x86/kvm/svm/nested.c",
"arch/x86/kvm/svm/svm.c",
"arch/x86/kvm/svm/svm.h"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.9"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.9",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.114",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.57",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.0.4",
"versionType": "semver",
"lessThanOrEqual": "7.0.*"
},
{
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"arch/x86/kvm/svm/nested.c",
"arch/x86/kvm/svm/svm.c",
"arch/x86/kvm/svm/svm.h"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-46032
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #46321 · Revision 1
- Added to Heist Feed
- Publisher date