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CVE Record

CVE-2020-25599: An issue was discovered in Xen through 4.14.x.

An issue was discovered in Xen through 4.14.x. There are evtchn_reset() race conditions. Uses of EVTCHNOP_reset (potentially by a guest on itself) or XEN_DOMCTL_soft_reset (by itself covered by XSA-77) can lead to the violation of various internal assumptions. This may lead to out of bounds memory accesses or triggering of bug checks. In particular, x86 PV guests may be able to elevate their privilege to that of the host. Host and guest crashes are also possible, leading to a Denial of Service (DoS). Information leaks cannot be ruled out. All Xen versions from 4.5 onwards are vulnerable. Xen versions 4.4 and earlier are not vulnerable.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysis

Security readout for executives and security teams

CVE-2020-25599 affects Xen hypervisors and can let guest activity break host assumptions during event-channel reset handling. Reported impacts include host or guest crashes, possible memory exposure, and possible host-level privilege escalation for x86 PV guests. Exposure is likely on Xen-based virtualization hosts running Xen 4.5 or later through 4.14.x, especially where x86 PV guests or untrusted tenants are present. Distribution advisories from Debian, Fedora, openSUSE, and Gentoo indicate package-level impact across supported Linux ecosystems. Treat this as high priority where Xen hosts run untrusted workloads. The worst-case impact crosses the guest-host isolation boundary, which can affect confidentiality, availability, and control of the virtualization platform. Patch planning should account for maintenance windows. Mitigation focus: Apply Xen or distribution security updates that address XSA-343.; Prioritize multi-tenant Xen hosts and systems running x86 PV guests.; Check vendor guidance for fixed package versions and restart requirements..

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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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