CVE-2026-68081

KVM: nVMX: Put vmcs12 pages if nested VM-Enter fails due to invalid guest state

State: Published
Severity: Not scored
Published: Aug 8, 2026
Updated: Oct 30, 2026
Reserved: Jul 30, 2026

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	96c66e87deeeb3cc78a3b82a1de8e365eec206c1 to before c174eb76484786721ae9a104344b952acf0e2717Affected 96c66e87deeeb3cc78a3b82a1de8e365eec206c1 to before a7bf4f5b19965e4466040ad6b24919c1ed326a84Affected 96c66e87deeeb3cc78a3b82a1de8e365eec206c1 to before f42669f931a6f45e5918cf5e99989b9a6c65e655Affected 96c66e87deeeb3cc78a3b82a1de8e365eec206c1 to before 7996013b85687034d2e820cef94d6404192e3a3dAffected 96c66e87deeeb3cc78a3b82a1de8e365eec206c1 to before 2c87a087c20632d68920272173b5d7c47f9bcf70Affected 96c66e87deeeb3cc78a3b82a1de8e365eec206c1 to before 2f2312c422fd2695da772cecb30c69994b795964Affected
LinuxLinux	5.2Affected before 5.2Not affected 6.1.191 through 6.1.Not affected 6.6.160 through 6.6.Not affected 6.12.114 through 6.12.Not affected 6.18.40 through 6.18.Not affected 7.1.5 through 7.1.*Not affected 7.2 and laterNot affected

Product

Versions

LinuxLinux

96c66e87deeeb3cc78a3b82a1de8e365eec206c1 to before c174eb76484786721ae9a104344b952acf0e2717Affected
96c66e87deeeb3cc78a3b82a1de8e365eec206c1 to before a7bf4f5b19965e4466040ad6b24919c1ed326a84Affected
96c66e87deeeb3cc78a3b82a1de8e365eec206c1 to before f42669f931a6f45e5918cf5e99989b9a6c65e655Affected
96c66e87deeeb3cc78a3b82a1de8e365eec206c1 to before 7996013b85687034d2e820cef94d6404192e3a3dAffected
96c66e87deeeb3cc78a3b82a1de8e365eec206c1 to before 2c87a087c20632d68920272173b5d7c47f9bcf70Affected
96c66e87deeeb3cc78a3b82a1de8e365eec206c1 to before 2f2312c422fd2695da772cecb30c69994b795964Affected

LinuxLinux

5.2Affected
before 5.2Not affected
6.1.191 through 6.1.*Not affected
6.6.160 through 6.6.*Not affected
6.12.114 through 6.12.*Not affected
6.18.40 through 6.18.*Not affected
7.1.5 through 7.1.*Not affected
7.2 and laterNot affected

References

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