{"id":"CVE-2026-42492","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-42492","generatedAt":"2026-10-28T03:26:16.742Z","title":"Xenstore, to have an up-to-date picture of the entire system, wants to know of domains appearing and disappearing.","description":"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.","published":"2026-07-28T13:18:32.000Z","lastModified":"2026-07-28T17:16:38.000Z","status":"Deferred","sourceIdentifier":"security@xen.org","cvss":{"version":"3.1","score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"cwe":["CWE-459"],"affected":[],"epss":{"score":0.00609,"percentile":0.48885,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.61%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"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"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-42492","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}