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CVE-2026-89932

KVM: nVMX: Always flush vpid02 on first use PUBLISHED

Description (CNA)

In 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 (CNA)

Vendor / productVersions
Linux / Linuxaffected 5c614b3583e7b6dab0c86356fa36c2bcbb8322a0 before 26de0d2d9a8d14c03e5ebb25fd68b5bfcd5ac366; affected 5c614b3583e7b6dab0c86356fa36c2bcbb8322a0 before 8bc609999ec223089fec8d74c7de27d689606b36; affected 5c614b3583e7b6dab0c86356fa36c2bcbb8322a0 before 62604376c313178811375f40a282fc2a46cd2311; affected 5c614b3583e7b6dab0c86356fa36c2bcbb8322a0 before 8b98d662ab24f34710a56e03bc9169e4a5508606; affected 5c614b3583e7b6dab0c86356fa36c2bcbb8322a0 before 22dfcc22c95e91295119a1c3b469816ce44c4804; affected 5c614b3583e7b6dab0c86356fa36c2bcbb8322a0 before 121991d150735f3c0f7401678ce4d35c5b4ac898; affected 5c614b3583e7b6dab0c86356fa36c2bcbb8322a0 before f0772389413dce9657c7d6950abf3edbbd511356
Linux / Linuxaffected 4.4; unaffected 0 before 4.4; unaffected 5.15.221 through 5.15.*; unaffected 6.1.188 through 6.1.*; unaffected 6.6.157 through 6.6.*; unaffected 6.12.110 through 6.12.*; unaffected 6.18.51 through 6.18.*; unaffected 7.2.5 through 7.2.*; unaffected 7.3 through *

CWE

No CWE identifiers supplied.

References