GHSA-8Q77-GPG3-WGRC
Vulnerability from github – Published: 2026-09-16 12:30 – Updated: 2026-09-16 15:31In the Linux kernel, the following vulnerability has been resolved:
KVM: nVMX: Always flush vpid02 on first use
Make sure vpid02 is always flushed on first use by setting last_vpid=0 when allocating vpid02. nested_vmx_transition_tlb_flush() will always detect a VPID change on first VM-Enter after VMXON, because VPID=0 in vmcs12 is not allowed if L1 enables VPID.
This avoids using stale TLB entries from a previous lifetime of the VPID, that might have been associated with a different vCPU (or a completely different VM).
Note that last_vpid is already being initialized as 0 when the vCPU is created, but it is not reset when vpid02 is freed on VMXOFF. Hence, the problem can only occur if L1 does VMXOFF -> VMXON, runs an L2, and KVM happens to reuse a VPID that has TLB entries on the physical CPU.
{
"affected": [],
"aliases": [
"CVE-2026-89932"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-16T11:17:02Z",
"severity": "HIGH"
},
"details": "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 -\u003e VMXON, runs an L2, and KVM\nhappens to reuse a VPID that has TLB entries on the physical CPU.",
"id": "GHSA-8q77-gpg3-wgrc",
"modified": "2026-09-16T15:31:02Z",
"published": "2026-09-16T12:30:41Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89932"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/121991d150735f3c0f7401678ce4d35c5b4ac898"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/22dfcc22c95e91295119a1c3b469816ce44c4804"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/26de0d2d9a8d14c03e5ebb25fd68b5bfcd5ac366"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/62604376c313178811375f40a282fc2a46cd2311"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/8b98d662ab24f34710a56e03bc9169e4a5508606"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/8bc609999ec223089fec8d74c7de27d689606b36"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f0772389413dce9657c7d6950abf3edbbd511356"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
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