Description
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 products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
5c614b3583e7b6dab0c86356fa36c2bcbb8322a0 to < 26de0d2d9a8d14c03e5ebb25fd68b5bfcd5ac366affected5c614b3583e7b6dab0c86356fa36c2bcbb8322a0 to < 8bc609999ec223089fec8d74c7de27d689606b36affected5c614b3583e7b6dab0c86356fa36c2bcbb8322a0 to < 62604376c313178811375f40a282fc2a46cd2311affected5c614b3583e7b6dab0c86356fa36c2bcbb8322a0 to < 8b98d662ab24f34710a56e03bc9169e4a5508606affected5c614b3583e7b6dab0c86356fa36c2bcbb8322a0 to < 22dfcc22c95e91295119a1c3b469816ce44c4804affected5c614b3583e7b6dab0c86356fa36c2bcbb8322a0 to < 121991d150735f3c0f7401678ce4d35c5b4ac898affected5c614b3583e7b6dab0c86356fa36c2bcbb8322a0 to < f0772389413dce9657c7d6950abf3edbbd511356affected
Linux Linux
Default version status: affected
4.4affected0 to < 4.4unaffected5.15.221 to ≤ 5.15.*unaffected6.1.188 to ≤ 6.1.*unaffected6.6.157 to ≤ 6.6.*unaffected6.12.110 to ≤ 6.12.*unaffected6.18.51 to ≤ 6.18.*unaffected7.2.5 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/26de0d2d9a8d14c03e5ebb25fd68b5bfcd5ac366 ↗
- https://git.kernel.org/stable/c/8bc609999ec223089fec8d74c7de27d689606b36 ↗
- https://git.kernel.org/stable/c/62604376c313178811375f40a282fc2a46cd2311 ↗
- https://git.kernel.org/stable/c/8b98d662ab24f34710a56e03bc9169e4a5508606 ↗
- https://git.kernel.org/stable/c/22dfcc22c95e91295119a1c3b469816ce44c4804 ↗
- https://git.kernel.org/stable/c/121991d150735f3c0f7401678ce4d35c5b4ac898 ↗
- https://git.kernel.org/stable/c/f0772389413dce9657c7d6950abf3edbbd511356 ↗