CVE-2026-79611 | BDVDB-2026-387102 Detail
XenXen
Description#
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.
Impact#
HVM/PVH guest userspace code may be able to crash the guest, resulting in a guest Denial of Service.
Weaknesses#
- CWE-843 Access of Resource Using Incompatible Type ('Type Confusion')
References#
Exploit#
No public exploit known
History#
- Version 1Record published in the CVE List.
- Version 2Most recent update recorded in the CVE List.