CVE-2026-68081
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.
Affected versions
Linux kernel versions
5.2
and later are affected. Fixed in
6.18.40,
7.1.5,
7.2
and their respective stable series.
References
3 totalFrequently asked questions
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What is CVE-2026-68081?
CVE-2026-68081 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 5.2 onward and has been patched in 6.18.40, 7.1.5 and 7.2. CVE-2026-68081 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-68081?
Yes. CVE-2026-68081 has been patched. Fixed versions include 6.18.40, 7.1.5 and 7.2. If you are running Linux kernel 5.2 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-68081 actively exploited?
No. CVE-2026-68081 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.