CVE-2026-68081 is a vulnerability in Linux Kernel
Published on August 8, 2026
KVM: nVMX: Put vmcs12 pages if nested VM-Enter fails due to invalid guest state
In the Linux kernel, the following vulnerability has been resolved:
KVM: nVMX: Put vmcs12 pages if nested VM-Enter fails due to invalid guest state
Put all vmcs12 pages if KVM synthesizes a nested VM-Exit due to invalid
guest while emulating VMLAUNCH or VMRESUME. The invalid guest state path
doesn't use nested_vmx_vmexit() as that API is intended to be used if and
only if L2 is active, and the open coded equivalent neglects to put the
vmcs12 pages. Failure to put the vmcs12 pages leaks any pinned pages
(and/or mappings) if L1 retries VMLAUNCH/VMRESUME.
Note, the !from_vmenter scenario doesn't suffer the same problem, as
vmx_get_nested_state_pages() only gets/pins/maps the vmcs12 pages if L2 is
active, i.e. if a "full" VM-Exit is guaranteed before KVM will retry
getting vmcs12 pages.
Products Associated with CVE-2026-68081
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Affected Versions
Linux:- Version 96c66e87deeeb3cc78a3b82a1de8e365eec206c1 and below 7996013b85687034d2e820cef94d6404192e3a3d is affected.
- Version 96c66e87deeeb3cc78a3b82a1de8e365eec206c1 and below 2c87a087c20632d68920272173b5d7c47f9bcf70 is affected.
- Version 96c66e87deeeb3cc78a3b82a1de8e365eec206c1 and below 2f2312c422fd2695da772cecb30c69994b795964 is affected.
- Version 5.2 is affected.
- Before 5.2 is unaffected.
- Version 6.18.40, <= 6.18.* is unaffected.
- Version 7.1.5, <= 7.1.* is unaffected.
- Version 7.2-rc4, <= * is unaffected.