CVE-2026-64562

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux355f4fb1405ec29d0fac49b4d41fcd78cbd455d5 < af56298e9d86e6098cd1d2e155cb2949b7c45412affected
LinuxLinux355f4fb1405ec29d0fac49b4d41fcd78cbd455d5 < 589419470030a89f16cf19300658b6dc644ca946affected
LinuxLinux355f4fb1405ec29d0fac49b4d41fcd78cbd455d5 < 8001d2ce9d9bd09118ce523aef595aa094573ae3affected
LinuxLinux355f4fb1405ec29d0fac49b4d41fcd78cbd455d5 < 1dabef6e206568bf9d9ade74f6e56a48ea35695daffected
LinuxLinux355f4fb1405ec29d0fac49b4d41fcd78cbd455d5 < 622ebfac01ba4f9c0060cebd41257fe46fc4a0b3affected
LinuxLinux4.9affected
LinuxLinux0 < 4.9unaffected
LinuxLinux6.6.148 <= 6.6.*unaffected
LinuxLinux6.12.101 <= 6.12.*unaffected
LinuxLinux6.18.42 <= 6.18.*unaffected
LinuxLinux7.1.6 <= 7.1.*unaffected
LinuxLinux7.2-rc5 <= *unaffected

Weaknesses

References