CVE-2026-42492

{"id": "CVE-2026-42492", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-42492", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-07-28T15:56:49.876014Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 3.9}]}, "affected": [{"source": "security@xen.org", "affectedData": [{"vendor": "Xen", "product": "Xen", "versions": [{"status": "unknown", "version": "consult Xen advisory XSA-496"}], "defaultStatus": "unknown"}]}], "published": "2026-07-28T13:18:32.123", "references": [{"url": "https://xenbits.xenproject.org/xsa/advisory-496.html", "source": "security@xen.org"}, {"url": "http://www.openwall.com/lists/oss-security/2026/07/28/13", "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "http://xenbits.xen.org/xsa/advisory-496.html", "source": "af854a3a-2127-422b-91ae-364da2661108"}], "vulnStatus": "Deferred", "weaknesses": [{"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "description": [{"lang": "en", "value": "CWE-459"}]}], "descriptions": [{"lang": "en", "value": "Xenstore, to have an up-to-date picture of the entire system, wants to\nknow of domains appearing and disappearing. To make this more robust, a\nnew XEN_DOMCTL_get_domain_state was introduced. The management of the\nbitmap underlying that operation is tied into the binding of the\nVIRQ_DOM_EXC virtual IRQ. Unfortunately an error path there would tear\ndown the bitmap even in cases when it wasn't set up. Unprivileged domains\ncan trigger that error path."}], "lastModified": "2026-07-28T17:16:38.303", "sourceIdentifier": "security@xen.org"}