Vulnerability Description
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.
References
- https://git.kernel.org/stable/c/2c87a087c20632d68920272173b5d7c47f9bcf70
- https://git.kernel.org/stable/c/2f2312c422fd2695da772cecb30c69994b795964
- https://git.kernel.org/stable/c/7996013b85687034d2e820cef94d6404192e3a3d
FAQ
What is CVE-2026-68081?
CVE-2026-68081 is a documented vulnerability. 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 V...
How severe is CVE-2026-68081?
CVSS scoring is not yet available for CVE-2026-68081. Check NVD for updates.
Is there a patch for CVE-2026-68081?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.