KVM: nVMX: Put vmcs12 pages if nested VM-Enter fails due to invalid guest state
In the Linux kernel, the following vulnerability has been resolved: KVM: nVMX: Put vmcs12 pages if nested VM-Enter fails due to invalid guest state Put all vmcs12 pages if KVM synthesizes a nested VM-Exit due to invalid guest while emulating VMLAUNCH or VMRESUME. The invalid guest state path doesn't use nested_vmx_vmexit() as that API is intended to be used if and only if L2 is active, and the open coded equivalent neglects to put the vmcs12 pages. Failure to put the vmcs12 pages leaks any pinned pages (and/or mappings) if L1 retries VMLAUNCH/VMRESUME. Note, the !from_vmenter scenario doesn't suffer the same problem, as vmx_get_nested_state_pages() only gets/pins/maps the vmcs12 pages if L2 is active, i.e. if a "full" VM-Exit is guaranteed before KVM will retry getting vmcs12 pages.
CVE-2026-68081
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-2026-68081
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": "96c66e87deeeb3cc78a3b82a1de8e365eec206c1",
"lessThan": "a7bf4f5b19965e4466040ad6b24919c1ed326a84",
"versionType": "git"
},
{
"status": "affected",
"version": "96c66e87deeeb3cc78a3b82a1de8e365eec206c1",
"lessThan": "f42669f931a6f45e5918cf5e99989b9a6c65e655",
"versionType": "git"
},
{
"status": "affected",
"version": "96c66e87deeeb3cc78a3b82a1de8e365eec206c1",
"lessThan": "7996013b85687034d2e820cef94d6404192e3a3d",
"versionType": "git"
},
{
"status": "affected",
"version": "96c66e87deeeb3cc78a3b82a1de8e365eec206c1",
"lessThan": "2c87a087c20632d68920272173b5d7c47f9bcf70",
"versionType": "git"
},
{
"status": "affected",
"version": "96c66e87deeeb3cc78a3b82a1de8e365eec206c1",
"lessThan": "2f2312c422fd2695da772cecb30c69994b795964",
"versionType": "git"
}
],
"programFiles": [
"arch/x86/kvm/vmx/nested.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.2"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.2",
"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": "6.18.40",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.5",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"arch/x86/kvm/vmx/nested.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-68081
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #46443 · Revision 1
- Added to Heist Feed
- Publisher date