Linux Kernel KVM nVMX: VMCS Pointer Race during VMCLEAR
CVE-2026-64562 Published on August 4, 2026
KVM: nVMX: Hide shadow VMCS right after VMCLEAR
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.
Products Associated with CVE-2026-64562
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Affected Versions
Linux:- Version 355f4fb1405ec29d0fac49b4d41fcd78cbd455d5 and below af56298e9d86e6098cd1d2e155cb2949b7c45412 is affected.
- Version 355f4fb1405ec29d0fac49b4d41fcd78cbd455d5 and below 589419470030a89f16cf19300658b6dc644ca946 is affected.
- Version 355f4fb1405ec29d0fac49b4d41fcd78cbd455d5 and below 8001d2ce9d9bd09118ce523aef595aa094573ae3 is affected.
- Version 355f4fb1405ec29d0fac49b4d41fcd78cbd455d5 and below 1dabef6e206568bf9d9ade74f6e56a48ea35695d is affected.
- Version 355f4fb1405ec29d0fac49b4d41fcd78cbd455d5 and below 622ebfac01ba4f9c0060cebd41257fe46fc4a0b3 is affected.
- Version 4.9 is affected.
- Before 4.9 is unaffected.
- Version 6.6.148, <= 6.6.* is unaffected.
- Version 6.12.101, <= 6.12.* is unaffected.
- Version 6.18.42, <= 6.18.* is unaffected.
- Version 7.1.6, <= 7.1.* is unaffected.
- Version 7.2-rc5, <= * is unaffected.