{ "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" } } } }