KVM: nVMX: Hide shadow VMCS right after VMCLEAR

Summary

In the Linux kernel, the following vulnerability has been resolved: KVM: nVMX: Hide shadow VMCS right after VMCLEAR free_nested() frees the shadow VMCS while vmcs01 still points to it. But because it is asynchronous with respect to loaded_vmcs_clear(), the vCPU might migrate before the pointer is cleared and __loaded_vmcs_clear() may then execute VMCLEAR. The VMCS needs to stay attached until its explicit VMCLEAR completes, but then it can be hidden and the page safely freed.

Timeline

1. Aug 4, 2026, 6:23 AM UTCCVE published
2. Oct 16, 2026, 3:42 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: total

3. Oct 19, 2026, 8:48 PM UTCRecord last updated

Affected versions

• Linux Linux

  From 355f4fb1405ec29d0fac49b4d41fcd78cbd455d5 · fixed in b82c3144d8264265448292ca406f60bafeba3b6f; From 355f4fb1405ec29d0fac49b4d41fcd78cbd455d5 · fixed in 4f50e6aec16f69627dbad5704d1e90a255d766a7; From 355f4fb1405ec29d0fac49b4d41fcd78cbd455d5 · fixed in dc3eecfa219ebc9d01eaf7d1abd1441efe884dab; From 355f4fb1405ec29d0fac49b4d41fcd78cbd455d5 · fixed in af56298e9d86e6098cd1d2e155cb2949b7c45412; From 355f4fb1405ec29d0fac49b4d41fcd78cbd455d5 · fixed in 589419470030a89f16cf19300658b6dc644ca946; From 355f4fb1405ec29d0fac49b4d41fcd78cbd455d5 · fixed in 8001d2ce9d9bd09118ce523aef595aa094573ae3; From 355f4fb1405ec29d0fac49b4d41fcd78cbd455d5 · fixed in 1dabef6e206568bf9d9ade74f6e56a48ea35695d; From 355f4fb1405ec29d0fac49b4d41fcd78cbd455d5 · fixed in 622ebfac01ba4f9c0060cebd41257fe46fc4a0b3

• Linux Linux

  4.9

• KernelLinux

  From 4.9.0 · fixed in 5.10.265; From 5.11.0 · fixed in 5.15.216; From 5.16.0 · fixed in 6.1.183; From 6.2.0 · fixed in 6.6.148; From 6.7.0 · fixed in 6.12.101; From 6.13.0 · fixed in 6.18.42; From 6.19.0 · fixed in 7.1.6

References 8