{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-62431","assignerOrgId":"23aa2041-22e1-471f-9209-9b7396fa234f","state":"PUBLISHED","assignerShortName":"XEN","dateReserved":"2026-07-14T10:28:12.655Z","datePublished":"2026-07-28T12:32:43.849Z","dateUpdated":"2026-07-28T16:33:31.447Z"},"containers":{"cna":{"title":"Viridian STIMER division by zero","datePublic":"2026-07-28T12:00:00.000Z","descriptions":[{"lang":"en","value":"The logic to handle periodic Viridian STIMERs performs a division with an\nunchecked user-controlled divisor value, that can be set to zero to cause a #DE\nfault."}],"impacts":[{"descriptions":[{"lang":"en","value":"Enabling Viridian STIMERs to unprivileged HVM guests can result in a Denial\nof Service (DoS) affecting the entire host."}]}],"affected":[{"defaultStatus":"unknown","product":"Xen","vendor":"Xen","versions":[{"status":"unknown","version":"consult Xen advisory XSA-504"}]}],"configurations":[{"lang":"en","value":"All Xen versions from 4.13 onwards are vulnerable.  Xen versions 4.12 and\nearlier are not vulnerable.\n\nOnly HVM guests with Viridian STIMERs enabled can trigger the vulnerability."}],"workarounds":[{"lang":"en","value":"Not enabling Viridian STIMERs for HVM guests will avoid the vulnerability.\n\nNote Viridian extensions are not enabled by default."}],"references":[{"url":"https://xenbits.xenproject.org/xsa/advisory-504.html"}],"providerMetadata":{"orgId":"23aa2041-22e1-471f-9209-9b7396fa234f","shortName":"XEN","dateUpdated":"2026-07-28T12:32:43.849Z"}},"adp":[{"title":"CVE Program Container","references":[{"url":"http://xenbits.xen.org/xsa/advisory-504.html"},{"url":"http://www.openwall.com/lists/oss-security/2026/07/28/20"}],"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2026-07-28T16:33:31.447Z"}},{"problemTypes":[{"descriptions":[{"type":"CWE","cweId":"CWE-369","lang":"en","description":"CWE-369 Divide By Zero"}]}],"metrics":[{"cvssV3_1":{"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"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-07-28T15:49:03.810668Z","id":"CVE-2026-62431","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-07-28T15:49:09.743Z"}}]}}