KVM: nVM: Ensure INVVPID is emulated on the correct physical CPU
In the Linux kernel, the following vulnerability has been resolved: KVM: nVM: Ensure INVVPID is emulated on the correct physical CPU When emulating INVVPID, KVM executes INVVPID on the physical CPU using vpid02 (instead of the L1 assigned VPID), after doing some validations on the operands. However, it is possible that the physical CPU KVM executes INVVPID on is different from the CPU L2 is running on. For example, in the following scenario: - L2 runs on CPU #1 and exits to L1 (vmx->nested.vmcs02.cpu=1) - L1 migrates to CPU #2 and executes INVVPID - KVM executes INVVPID on CPU #2 - L1 migrates back to CPU #1 and runs L2 (vmx->nested.vmcs02.cpu=1) The TLB entries on CPU #1 are never invalidated, because INVVPID was executed on CPU #2, and vmcs02 never ran on a different pCPU (i.e. vmx_vcpu_load_vmcs() will *not* request KVM_REQ_TLB_FLUSH). Ensure that INVVPID is being executed on the same pCPU that L2 last ran on, and if not, fallback to clearing last_vpid=0 to trigger a full VPID flush on the next nested VM-Enter (as KVM will detect L1 using a different VPID for L2). If L2 ends up running on a different pCPU, KVM will flush the TLB anyway through vmx_vcpu_load_vmcs().
CVE-2026-89929
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-2026-89929
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": "5c614b3583e7b6dab0c86356fa36c2bcbb8322a0",
"lessThan": "1759a565a25c814ced9281a708749c71fa69d6fe",
"versionType": "git"
},
{
"status": "affected",
"version": "5c614b3583e7b6dab0c86356fa36c2bcbb8322a0",
"lessThan": "d03e721801ac54b9fdf05668aa0c069f07913b68",
"versionType": "git"
},
{
"status": "affected",
"version": "5c614b3583e7b6dab0c86356fa36c2bcbb8322a0",
"lessThan": "27bdeb5fd19046ffba9ff234e92fe553eb2efb30",
"versionType": "git"
},
{
"status": "affected",
"version": "5c614b3583e7b6dab0c86356fa36c2bcbb8322a0",
"lessThan": "9941850e8adf164d005dbd3774c4b79e91a3cb8e",
"versionType": "git"
},
{
"status": "affected",
"version": "5c614b3583e7b6dab0c86356fa36c2bcbb8322a0",
"lessThan": "6d00e67326d831e6e610933a3800712f4ffe6ec1",
"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": "4.4"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.4",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.110",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.51",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.5",
"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-2026-89929
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #48568 · Revision 1
- Added to Heist Feed
- Publisher date