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CVE-2020-25595: An issue was discovered in Xen through 4.14.x.

An issue was discovered in Xen through 4.14.x. The PCI passthrough code improperly uses register data. Code paths in Xen's MSI handling have been identified that act on unsanitized values read back from device hardware registers. While devices strictly compliant with PCI specifications shouldn't be able to affect these registers, experience shows that it's very common for devices to have out-of-spec "backdoor" operations that can affect the result of these reads. A not fully trusted guest may be able to crash Xen, leading to a Denial of Service (DoS) for the entire system. Privilege escalation and information leaks cannot be excluded. All versions of Xen supporting PCI passthrough are affected. Only x86 systems are vulnerable. Arm systems are not vulnerable. Only guests with passed through PCI devices may be able to leverage the vulnerability. Only systems passing through devices with out-of-spec ("backdoor") functionality can cause issues. Experience shows that such out-of-spec functionality is common; unless you have reason to believe that your device does not have such functionality, it's better to assume that it does.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysis

Security readout for executives and security teams

This Xen flaw affects x86 hosts using PCI passthrough. A less-trusted guest with a passed-through PCI device may crash the hypervisor, causing a system-wide denial of service. Xen says privilege escalation and information leaks cannot be excluded, but the provided sources do not confirm exploitation. Exposure is concentrated in Xen x86 virtualization environments that pass PCI devices into guests, especially where guest tenants are not fully trusted. Hosts without PCI passthrough, Arm Xen systems, or environments without untrusted passthrough guests are not described as vulnerable by the source bundle. Treat this as high priority for Xen platforms that use PCI passthrough with untrusted or semi-trusted guests. The main confirmed risk is full-host denial of service, which can disrupt multiple workloads. Broader impacts are possible but not proven in the supplied sources. Mitigation focus: Apply Xen or distribution updates that address XSA-337.; Review vendor advisories from Xen, Debian, Fedora, openSUSE, or Gentoo.; Disable PCI passthrough for untrusted guests until remediated..

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Severity
Unknown
CVSS
Not scored
Known Exploited
No
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CNA and ADP enrichment extracted from CVE v5

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