{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-62432","assignerOrgId":"23aa2041-22e1-471f-9209-9b7396fa234f","state":"PUBLISHED","assignerShortName":"XEN","dateReserved":"2026-07-14T10:28:12.655Z","datePublished":"2026-07-28T12:32:52.043Z","dateUpdated":"2026-07-28T16:33:32.509Z"},"containers":{"cna":{"title":"evtchn: Race between FIFO expand and reset","datePublic":"2026-07-28T12:00:00.000Z","descriptions":[{"lang":"en","value":"The EVTCHNOP_expand_array hypercall checks for whether FIFO event\nchannels are enabled, but without holding the correct lock.  It can race\nwith EVTCHNOP_reset, resulting in dereferencing a NULL pointer."}],"impacts":[{"descriptions":[{"lang":"en","value":"A malicious HVM guest (x86 HVM or PVH, and ARM) can crash Xen leading to\na denial of service.\n\nA malicious x86 PV guest can most likely crash Xen leading to a denial\nof service, but memory corruption or privilege escalation cannot be\nruled out."}]}],"affected":[{"defaultStatus":"unknown","product":"Xen","vendor":"Xen","versions":[{"status":"unknown","version":"consult Xen advisory XSA-505"}]}],"configurations":[{"lang":"en","value":"All Xen versions from 4.5 onwards are vulnerable.  Xen versions 4.4 and\nearlier are not vulnerable."}],"workarounds":[{"lang":"en","value":"There are no mitigations."}],"references":[{"url":"https://xenbits.xenproject.org/xsa/advisory-505.html"}],"providerMetadata":{"orgId":"23aa2041-22e1-471f-9209-9b7396fa234f","shortName":"XEN","dateUpdated":"2026-07-28T12:32:52.043Z"}},"adp":[{"title":"CVE Program Container","references":[{"url":"http://xenbits.xen.org/xsa/advisory-505.html"},{"url":"http://www.openwall.com/lists/oss-security/2026/07/28/21"}],"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2026-07-28T16:33:32.509Z"}},{"problemTypes":[{"descriptions":[{"type":"CWE","cweId":"CWE-362","lang":"en","description":"CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')"}]}],"metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":7.3,"attackVector":"NETWORK","baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","integrityImpact":"LOW","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"LOW","privilegesRequired":"NONE","confidentialityImpact":"LOW"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-07-28T15:13:34.638706Z","id":"CVE-2026-62432","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":"2026-07-28T15:13:39.575Z"}}]}}