KVM: nVMX: Force MSR bitmap refresh if runtime eVMCS controls are modified
In the Linux kernel, the following vulnerability has been resolved: KVM: nVMX: Force MSR bitmap refresh if runtime eVMCS controls are modified Force a refresh of the vmcs02 MSR bitmap during nested VM-Enter if the runtime eVMCS controls (pin, primary, secondary, etc.) are being updated. If L1 isn't intercepting TPR writes, runs L2 with TPR virtualization, and then runs the same L2 with TPR virtualization disabled, KVM will fail to refresh msr_bitmap02 and leave TPR in passthrough mode even though TPR virtualization is disabled. I.e. failure to refresh the bitmap lets L2 (or L1 by proxy) read and write L0's TPR.
CVE-2026-98720
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-2026-98720
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": "502d2bf5f2fd7c05adc2d4f057910bd5d4c4c63e",
"lessThan": "2db11598b59f16ddb6420693f9a4ac4efc3d4789",
"versionType": "git"
},
{
"status": "affected",
"version": "502d2bf5f2fd7c05adc2d4f057910bd5d4c4c63e",
"lessThan": "f6189e26d0237e47e2f04f9cb1e43fd19a9b2f3a",
"versionType": "git"
},
{
"status": "affected",
"version": "502d2bf5f2fd7c05adc2d4f057910bd5d4c4c63e",
"lessThan": "1e497e3bdab6983deb68a1d26b488027deb4527f",
"versionType": "git"
},
{
"status": "affected",
"version": "502d2bf5f2fd7c05adc2d4f057910bd5d4c4c63e",
"lessThan": "2abb25273c82061dd4670690c81c319c03740bf6",
"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": "5.17"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.17",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.12.113",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.56",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.10",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"arch/x86/kvm/vmx/nested.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-98720
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #38702 · Revision 1
- Added to Heist Feed
- Publisher date