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CVE-2019-19583: An issue was discovered in Xen through 4.12.x allowing x86 HVM/PVH guest OS users to cause a denial of serv...

An issue was discovered in Xen through 4.12.x allowing x86 HVM/PVH guest OS users to cause a denial of service (guest OS crash) because VMX VMEntry checks mishandle a certain case. Please see XSA-260 for background on the MovSS shadow. Please see XSA-156 for background on the need for #DB interception. The 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. HVM/PVH guest userspace code may be able to crash the guest, resulting in a guest Denial of Service. All versions of Xen are affected. Only systems supporting VMX hardware virtual extensions (Intel, Cyrix, or Zhaoxin CPUs) are affected. Arm and AMD systems are unaffected. Only HVM/PVH guests are affected. PV guests cannot leverage the vulnerability.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysis

Security readout for executives and security teams

This Xen flaw lets code inside certain virtual machines crash that same guest operating system. The source bundle describes denial of service, not host takeover or cross-guest compromise. Exposure matters most where untrusted users can run code inside Xen HVM or PVH guests on VMX-capable CPUs. Likely exposed systems run Xen with HVM or PVH guests on Intel, Cyrix, or Zhaoxin VMX-capable CPUs. AMD and Arm systems are stated unaffected. PV guests cannot leverage this issue. Multi-tenant or user-accessible guest environments carry the highest operational risk. Treat as a scheduled but important virtualization-platform patch. It is not evidenced as exploited or host-compromising, but guest crashes can disrupt business services, especially in shared hosting or environments where customers or developers control guest workloads. Mitigation focus: Review Xen XSA-308 and relevant distribution advisories for fixed packages.; Update Xen hypervisors using vendor-supported packages from your platform provider.; Prioritize VMX hosts running HVM or PVH guests with untrusted users..

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

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