{"id":"CVE-2026-62432","state":"PUBLISHED","title":"evtchn: Race between FIFO expand and reset","description":"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.","publishedAt":"2026-07-28T12:32:52.043Z","updatedAt":"2026-07-28T16:33:32.509Z","severity":{"score":7.3,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","source":"CISA-ADP"},"assigner":"XEN","products":["Xen Xen"],"affected":[{"vendor":"Xen","product":"Xen","defaultStatus":"unknown","versions":[{"version":"consult Xen advisory XSA-505","status":"unknown"}]}],"references":["https://xenbits.xenproject.org/xsa/advisory-505.html","http://xenbits.xen.org/xsa/advisory-505.html","http://www.openwall.com/lists/oss-security/2026/07/28/21"],"weaknesses":["CWE-362"],"ingestedAt":"2026-10-29T20:12:32.778Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/62xxx/CVE-2026-62432.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-62432","state":"PUBLISHED","datePublished":"2026-07-28T12:32:52.043Z","dateUpdated":"2026-07-28T16:33:32.509Z","assignerShortName":"XEN","assignerOrgId":"23aa2041-22e1-471f-9209-9b7396fa234f","dateReserved":"2026-07-14T10:28:12.655Z"},"containers":{"cna":{"title":"evtchn: Race between FIFO expand and reset","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."}],"affected":[{"vendor":"Xen","product":"Xen","defaultStatus":"unknown","versions":[{"version":"consult Xen advisory XSA-505","status":"unknown"}]}],"references":[{"url":"https://xenbits.xenproject.org/xsa/advisory-505.html"}],"providerMetadata":{"shortName":"XEN","orgId":"23aa2041-22e1-471f-9209-9b7396fa234f","dateUpdated":"2026-07-28T12:32:52.043Z"},"datePublic":"2026-07-28T12:00:00.000Z","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."}]}],"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."}]},"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":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2026-07-28T16:33:32.509Z"}},{"title":"CISA ADP Vulnrichment","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"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-362","type":"CWE","lang":"en","description":"CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-07-28T15:13:39.575Z"}}]}}}