CVE-2026-46082
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KVM SVM #UD Injection on EFER.SVME=0

Publication date: 2026-05-27

Last updated on: 2026-06-01

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: KVM: SVM: Inject #UD for INVLPGA if EFER.SVME=0 INVLPGA should cause a #UD when EFER.SVME is not set. Add a check to properly inject #UD when EFER.SVME=0. [sean: tag for stable@]
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Meta Information
Published
2026-05-27
Last Modified
2026-06-01
Generated
2026-06-16
AI Q&A
2026-05-27
EPSS Evaluated
2026-06-15
NVD
CVE-2026-46082
EUVD
EUVD-2026-32465
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *
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Exploitability
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KEV
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CWE ID Description
CWE-UNKNOWN
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Executive Summary

This vulnerability is in the Linux kernel's KVM (Kernel-based Virtual Machine) component, specifically related to SVM (Secure Virtual Machine) functionality. The issue involves the handling of the INVLPGA instruction, which should trigger a #UD (Undefined Instruction) exception if the EFER.SVME bit is not set. The vulnerability was that this check was missing or incorrect, allowing the instruction to be processed improperly. The fix adds a proper check to inject the #UD exception when EFER.SVME is zero.

Impact Analysis

If exploited, this vulnerability could cause the Linux kernel's virtualization subsystem to behave incorrectly by not properly handling the INVLPGA instruction when the EFER.SVME bit is unset. This could potentially lead to unexpected behavior or instability in virtualized environments using KVM with SVM support.

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