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CVE Record

CVE-2019-19580: An issue was discovered in Xen through 4.12.x allowing x86 PV guest OS users to gain host OS privileges by...

An issue was discovered in Xen through 4.12.x allowing x86 PV guest OS users to gain host OS privileges by leveraging race conditions in pagetable promotion and demotion operations, because of an incomplete fix for CVE-2019-18421. XSA-299 addressed several critical issues in restartable PV type change operations. Despite extensive testing and auditing, some corner cases were missed. A malicious PV guest administrator may be able to escalate their privilege to that of the host. All security-supported versions of Xen are vulnerable. Only x86 systems are affected. Arm systems are not affected. Only x86 PV guests can leverage the vulnerability. x86 HVM and PVH guests cannot leverage the vulnerability. Note that these attacks require very precise timing, which may be difficult to exploit in practice.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysis

Security readout for executives and security teams

CVE-2019-19580 is a Xen hypervisor flaw where an administrator inside a specific type of guest VM could potentially gain host-level privileges. The issue is limited to x86 PV guests, not Arm, HVM, or PVH guests. Exploitation requires precise timing, but a successful attack would cross a major virtualization trust boundary. Exposure is most likely in environments running Xen through 4.12.x or security-supported Xen versions with x86 PV guests. x86 HVM, x86 PVH, and Arm systems are stated as not able to leverage this issue. Cloud, hosting, and multi-tenant virtualization environments should prioritize inventory validation. Treat this as high priority where Xen hosts run untrusted or multi-tenant x86 PV guests. The business risk is host compromise from inside a guest VM. Environments without x86 PV guests have materially lower exposure according to the provided sources. Mitigation focus: Identify Xen hosts running x86 PV guests.; Apply Xen or distribution security updates from vendor advisories.; Review Xen XSA-310 guidance for affected configurations and fixes..

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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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0CVSS vectors
0Timeline events
0ADP providers
7Source links

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Affected products

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