CVEvulnerability
CVE-2026-79611
5.5 MEDIUM
Official page ↗
- Status
- Awaiting Analysis
- Published
- 2026-10-13
- Last modified
- 2026-10-20
- Assigner
- [email protected]
- CVSS 3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0)
- 5.5 MEDIUM — CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weaknesses
- CWE-843
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.
Related
Weakness · CWE (1)
- CWE-843 Access of Resource Using Incompatible Type weakness
References
- https://xenbits.xenproject.org/xsa/advisory-518.html xenbits.xenproject.org
- http://www.openwall.com/lists/oss-security/2026/10/13/7 www.openwall.com
- http://xenbits.xen.org/xsa/advisory-518.html xenbits.xen.org