{"cve":{"cve_id":"CVE-2026-42490","is_kev":false,"kev_date_added":null,"kev_vendor_project":null,"kev_product":null,"kev_vulnerability_name":null,"kev_short_description":null,"kev_required_action":null,"kev_due_date":null,"kev_known_ransomware":null,"kev_notes":null,"kev_cwes":null,"epss_score":0.002,"epss_percentile":0.09821,"epss_as_of":"2026-06-23","description":"[This CNA information record relates to multiple CVEs; the\ntext explains which aspects/vulnerabilities correspond to which CVE.]\n\nTo create and manage guests, domctl operations are used by the control\ndomain, a possible Xenstore domain, or by a domain controlling a\nparticular guest.  Some of these operations may not be executed in\nparallel, so a system-wide lock is used.  The way that lock is acquired\nis, however, not providing any fairness.  This is CVE-2026-42489.\n\nFurthermore, with XSM/Flask in use, the lock acquire will, for some\noperations, occur ahead of any permission checking.  This is\nCVE-2026-42490.","published_at":"2026-06-18T13:47:13.257000Z","last_modified_at":null,"cvss_v3_score":6.5,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cvss_v3_severity":"MEDIUM","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":null,"ssvc_automatable":null,"ssvc_technical_impact":null,"cwes":["CWE-667"],"nvd_references":["https://xenbits.xenproject.org/xsa/advisory-492.html"],"vuln_status":null,"trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-06-24T00:09:39.878444Z","updated_at":"2026-06-28T23:30:20.145142Z"},"effective_severity":"MEDIUM","badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"PR","name":"Privileges Required","value":"L","value_label":"Low"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"S","name":"Scope","value":"U","value_label":"Unchanged"},{"metric":"C","name":"Confidentiality","value":"N","value_label":"None"},{"metric":"I","name":"Integrity","value":"N","value_label":"None"},{"metric":"A","name":"Availability","value":"H","value_label":"High"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"xen","vendor_name":"Xen","product_slug":"xen","product_name":"Xen","version_start":"consult Xen advisory XSA-492","version_start_inclusive":true,"version_end":"consult Xen advisory XSA-492","version_end_inclusive":true,"cpe23_uri":"cve5:xen:xen:consult Xen advisory XSA-492:consult Xen advisory XSA-492"}],"exploit_refs":[],"news":[],"references":[{"url":"https://xenbits.xenproject.org/xsa/advisory-492.html","source_type":"MISC","tags":[]}],"timeline":[{"type":"published","at":"2026-06-18T13:47:13.257000Z","label":"CVE published","source":null},{"type":"cvss_changed","at":"2026-06-28T17:54:12.493575Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:54:12.493575Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:54:12.493575Z","label":"CVSS score revised","source":"cvelistv5"}]}