Signal is active with 1 mentions in latest observed window
Recommended action window: Monitor and triage in normal cycle
NVD 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.
Priority
LOW
Exploitation
NONE
PoC
NONE
Patch
NONE
Momentum
NONE
HIGH-SEVERITY ALERT | XENSERVER #Citrix disclosed issues affecting XenServer 8.4 & 9. Three issues let a privileged guest VM user compromise or crash the host; CVE-2026-79611 may crash that guest VM. Update to the latest version ASAP. Help: servicedesk@intrasystems.com