{"id":"CVE-2026-62431","state":"PUBLISHED","title":"Viridian STIMER division by zero","description":"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.","publishedAt":"2026-07-28T12:32:43.849Z","updatedAt":"2026-07-28T16:33:31.447Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"CISA-ADP"},"assigner":"XEN","products":["Xen Xen"],"affected":[{"vendor":"Xen","product":"Xen","defaultStatus":"unknown","versions":[{"version":"consult Xen advisory XSA-504","status":"unknown"}]}],"references":["https://xenbits.xenproject.org/xsa/advisory-504.html","http://xenbits.xen.org/xsa/advisory-504.html","http://www.openwall.com/lists/oss-security/2026/07/28/20"],"weaknesses":["CWE-369"],"ingestedAt":"2026-10-29T20:12:32.778Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/62xxx/CVE-2026-62431.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-62431","state":"PUBLISHED","datePublished":"2026-07-28T12:32:43.849Z","dateUpdated":"2026-07-28T16:33:31.447Z","assignerShortName":"XEN","assignerOrgId":"23aa2041-22e1-471f-9209-9b7396fa234f","dateReserved":"2026-07-14T10:28:12.655Z"},"containers":{"cna":{"title":"Viridian STIMER division by zero","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."}],"affected":[{"vendor":"Xen","product":"Xen","defaultStatus":"unknown","versions":[{"version":"consult Xen advisory XSA-504","status":"unknown"}]}],"references":[{"url":"https://xenbits.xenproject.org/xsa/advisory-504.html"}],"providerMetadata":{"shortName":"XEN","orgId":"23aa2041-22e1-471f-9209-9b7396fa234f","dateUpdated":"2026-07-28T12:32:43.849Z"},"datePublic":"2026-07-28T12:00:00.000Z","impacts":[{"descriptions":[{"lang":"en","value":"Enabling Viridian STIMERs to unprivileged HVM guests can result in a Denial\nof Service (DoS) affecting the entire host."}]}],"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."}]},"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":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2026-07-28T16:33:31.447Z"}},{"title":"CISA ADP Vulnrichment","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"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-369","type":"CWE","lang":"en","description":"CWE-369 Divide By Zero"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-07-28T15:49:09.743Z"}}]}}}