PT-2026-43943 · Linux · Linux Kernel
CVSS v3.1
7.9
High
| Vector | AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H |
Name of the Vulnerable Software and Affected Versions
Linux kernel (affected versions not specified)
Description
An issue exists in the KVM nSVM component where a VMMCALL is not properly handled when L2 is active, L1 does not want to intercept the VMMCALL,
nested svm l2 tlb flush enabled() is true, and the hypercall is not a supported Hyper-V hypercall. In this scenario, KVM intercepts the VMMCALL but fails to forward it to L1, allowing L2 to make hypercalls as if it were L1. The expected architectural behavior is to raise a #UD (Undefined Opcode) exception if the VMMCALL is not intercepted.Recommendations
At the moment, there is no information about a newer version that contains a fix for this vulnerability.
Exploit
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Related Identifiers
Affected Products
Linux Kernel