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CVE Record

CVE-2019-19582: An issue was discovered in Xen through 4.12.x allowing x86 guest OS users to cause a denial of service (inf...

An issue was discovered in Xen through 4.12.x allowing x86 guest OS users to cause a denial of service (infinite loop) because certain bit iteration is mishandled. In a number of places bitmaps are being used by the hypervisor to track certain state. Iteration over all bits involves functions which may misbehave in certain corner cases: On x86 accesses to bitmaps with a compile time known size of 64 may incur undefined behavior, which may in particular result in infinite loops. A malicious guest may cause a hypervisor crash or hang, resulting in a Denial of Service (DoS). All versions of Xen are vulnerable. x86 systems with 64 or more nodes are vulnerable (there might not be any such systems that Xen would run on). x86 systems with less than 64 nodes are not vulnerable.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysis

Security readout for executives and security teams

CVE-2019-19582 is a Xen hypervisor denial-of-service flaw. A malicious or compromised x86 guest could make the hypervisor hang or crash, affecting other workloads on the same host. Public source text says practical exposure requires x86 systems with 64 or more nodes, and notes such systems may not exist for Xen. Most environments are likely not exposed unless they run Xen on x86 hosts with 64 or more nodes. Multi-tenant or untrusted guest environments would have higher concern because exploitation starts from a guest OS user context. Treat as a targeted infrastructure availability risk. It is not KEV and appears narrowly exposed, but affected shared Xen hosts could suffer broad workload disruption. Validate exposure first, then patch confirmed Xen deployments through normal emergency-maintenance channels if exposed. Mitigation focus: Review Xen XSA-307 and applicable distribution advisories.; Apply Xen security updates from the relevant vendor or distribution.; Prioritize multi-tenant Xen hosts with untrusted guest workloads..

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Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

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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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7Source links

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