UNKNOWN NVD
CVE-2026-79611
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 acti
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.
References
- https://xenbits.xenproject.org/xsa/advisory-518.html
- http://www.openwall.com/lists/oss-security/2026/10/13/7
- http://xenbits.xen.org/xsa/advisory-518.html
- https://www.openwall.com/lists/oss-security/2026/10/13/7
This unknown severity vulnerability was published on 2026-10-13 via NVD.
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