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vuln-cve/data/2026/89xxx/CVE-2026-89932.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-89932",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2026-09-11T19:38:34.776Z",
"datePublished": "2026-09-16T10:32:22.886Z",
"dateUpdated": "2026-10-19T08:55:06.898Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-10-19T08:55:06.898Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: nVMX: Always flush vpid02 on first use\n\nMake sure vpid02 is always flushed on first use by setting last_vpid=0\nwhen allocating vpid02. nested_vmx_transition_tlb_flush() will always\ndetect a VPID change on first VM-Enter after VMXON, because VPID=0 in\nvmcs12 is not allowed if L1 enables VPID.\n\nThis avoids using stale TLB entries from a previous lifetime of the\nVPID, that might have been associated with a different vCPU (or a\ncompletely different VM).\n\nNote that last_vpid is already being initialized as 0 when the vCPU is\ncreated, but it is not reset when vpid02 is freed on VMXOFF. Hence, the\nproblem can only occur if L1 does VMXOFF -> VMXON, runs an L2, and KVM\nhappens to reuse a VPID that has TLB entries on the physical CPU."
}
],
"metrics": [
{
"cvssV3_1": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
"baseScore": 8.8,
"baseSeverity": "HIGH"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - Reached when an L1 nested-VMX guest executes VMXOFF then VMXON and VMLAUNCH/VMRESUME on the host KVM_RUN path (handle_vmxon/enter_vmx_operation into nested_vmx_transition_tlb_flush); no network, adjacent-radio, or physical path hits nVMX VPID allocation.\nAC:L - The L1 attacker fully controls VMXOFF, VMXON, vmcs12 VPID, and vCPU pinning; allocate_vpid() is a deterministic global bitmap, nested VMX and VPID are default, and skipping last_vpid=0 makes the omitted INVVPID on first VM-Enter after VMXON reliably hit.\nPR:L - Needs /dev/kvm and nested VMX, typically a kvm-group user or cloud tenant running QEMU, not init-namespace root; handle_vmxon() only checks guest CPL=0 and CR4.VMXE, and KVM create/run ioctls have no CAP_SYS_ADMIN gate.\nUI:N - Once the attacker has a nested-capable VM, they trigger the flaw with their own VMXOFF/VMXON and VMLAUNCH; no separate victim action such as attaching a device or mounting a filesystem is required.\nS:C - Skipping the vpid02 INVVPID lets L2 use stale hardware TLB entries from a previous lifetime of that VPID, including another vCPU or a different VM, crossing KVM guest isolation so impact is outside L1's security authority.\nC:H - Reused vpid02 linear or combined TLB entries can translate L2 loads onto another VM's or recycled host physical pages, giving a read primitive over co-resident guest memory rather than a bounded pointer leak.\nI:H - The same stale translations apply to stores, so L2 can write through another VM's cached GPA/HPA mappings, corrupting co-resident guest memory and enabling control-flow hijack in the victim VM or further host compromise if pages were reused.\nA:H - Stale VPID hits produce wrong translations that surface as KVM internal/emulation failures and can oops or panic the host when walks land on recycled or unmapped host pages, denying service to the hypervisor and co-located VMs."
}
]
}
],
"affected": [
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"arch/x86/kvm/vmx/nested.c"
],
"versions": [
{
"version": "5c614b3583e7b6dab0c86356fa36c2bcbb8322a0",
"lessThan": "26de0d2d9a8d14c03e5ebb25fd68b5bfcd5ac366",
"status": "affected",
"versionType": "git"
},
{
"version": "5c614b3583e7b6dab0c86356fa36c2bcbb8322a0",
"lessThan": "8bc609999ec223089fec8d74c7de27d689606b36",
"status": "affected",
"versionType": "git"
},
{
"version": "5c614b3583e7b6dab0c86356fa36c2bcbb8322a0",
"lessThan": "62604376c313178811375f40a282fc2a46cd2311",
"status": "affected",
"versionType": "git"
},
{
"version": "5c614b3583e7b6dab0c86356fa36c2bcbb8322a0",
"lessThan": "8b98d662ab24f34710a56e03bc9169e4a5508606",
"status": "affected",
"versionType": "git"
},
{
"version": "5c614b3583e7b6dab0c86356fa36c2bcbb8322a0",
"lessThan": "22dfcc22c95e91295119a1c3b469816ce44c4804",
"status": "affected",
"versionType": "git"
},
{
"version": "5c614b3583e7b6dab0c86356fa36c2bcbb8322a0",
"lessThan": "121991d150735f3c0f7401678ce4d35c5b4ac898",
"status": "affected",
"versionType": "git"
},
{
"version": "5c614b3583e7b6dab0c86356fa36c2bcbb8322a0",
"lessThan": "f0772389413dce9657c7d6950abf3edbbd511356",
"status": "affected",
"versionType": "git"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"arch/x86/kvm/vmx/nested.c"
],
"versions": [
{
"version": "4.4",
"status": "affected"
},
{
"version": "0",
"lessThan": "4.4",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.15.221",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.1.188",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.6.157",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.12.110",
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.18.51",
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.2.5",
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.3",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.4",
"versionEndExcluding": "5.15.221"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.4",
"versionEndExcluding": "6.1.188"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.4",
"versionEndExcluding": "6.6.157"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.4",
"versionEndExcluding": "6.12.110"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.4",
"versionEndExcluding": "6.18.51"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.4",
"versionEndExcluding": "7.2.5"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.4",
"versionEndExcluding": "7.3"
}
]
}
]
}
],
"references": [
{
"url": "https://git.kernel.org/stable/c/26de0d2d9a8d14c03e5ebb25fd68b5bfcd5ac366"
},
{
"url": "https://git.kernel.org/stable/c/8bc609999ec223089fec8d74c7de27d689606b36"
},
{
"url": "https://git.kernel.org/stable/c/62604376c313178811375f40a282fc2a46cd2311"
},
{
"url": "https://git.kernel.org/stable/c/8b98d662ab24f34710a56e03bc9169e4a5508606"
},
{
"url": "https://git.kernel.org/stable/c/22dfcc22c95e91295119a1c3b469816ce44c4804"
},
{
"url": "https://git.kernel.org/stable/c/121991d150735f3c0f7401678ce4d35c5b4ac898"
},
{
"url": "https://git.kernel.org/stable/c/f0772389413dce9657c7d6950abf3edbbd511356"
}
],
"title": "KVM: nVMX: Always flush vpid02 on first use",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
}
}
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