EUVD-2026-72719
GHSA-vfxv-3qcw-g966
Severity by source
AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
AC:H reflects the race condition timing requirement; all other metrics follow the vendor vector: local low-privilege guest, scope change to hypervisor, availability-only impact.
Primary rating from Vendor (XEN).
CVSS VectorVendor: XEN
Lifecycle Timeline
4DescriptionCVE.org
When guests are terminated, various pieces of cleanup need carrying out. The cleaning up of PCI devices which were assigned to guests, and the associated removal of tracking structures for IRQs used by the devices occurs relatively early in the process. Unfortunately after that point the guest about to be terminated could cause its device model (DM) to re-establish such tracking structures, by having it bind one or more IRQs anew. While some of those tracking structures would still be cleaned up later on, at least one would not be.
AnalysisAI
Xen hypervisor contains a race condition (XSA-509) during guest termination that allows a guest to induce its device model to re-establish IRQ tracking structures for PCI devices after those structures have already been torn down in the cleanup sequence. At least one of the re-established tracking structures is never subsequently freed, resulting in a resource leak that can impact hypervisor availability. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to be running code inside a Xen guest that has one or more PCI devices assigned to it via Xen's PCI passthrough (device assignment) mechanism. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 6.5 base score with vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H accurately captures the threat model: a guest with low-privilege access can cross security domain boundaries (S:C) to impact hypervisor availability (A:H). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply the patches provided in Xen Security Advisory XSA-509, available at https://xenbits.xenproject.org/xsa/advisory-509.html. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-362 – Race Condition
View allSame technique Race Condition
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External POC / Exploit Code
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