CVE-2026-79611NVD

Vulnerability Summary

For XSA-308 logic was introduced, as VMX VMEntry checks do not like the
exact combination of state which occurs when #DB in intercepted, Single
Stepping is active, and blocked by STI/MovSS is active, despite this being
a legitimate state to be in. The resulting VMEntry failure is fatal to
the guest.

Sadly there is another special sub-case of the above, with branch tracing
enabled. In that case the prior adjustment would still cause a VMentry
failure, as before fatal to the guest.

Severity Level

UNKNOWN

Published Date

Oct 13, 2026

Last Modified

Oct 14, 2026

Exploitation Status

No confirmed exploitation yet

EPSS Score (30-Day)

0.17%Probability

Root Weakness (CWE)

N/A

Affected & Patched Versions

Affected Versions

Not provided by NVD for this CVE.

Patched Versions

Not provided by NVD for this CVE.

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