{"cve":{"cve_id":"CVE-2026-49412","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":null,"epss_percentile":null,"epss_as_of":null,"description":"The kernel handler for IPV6_MSFILTER dropped a serializing lock in order to copy the source-filter list from userspace, then reacquired the lock.  During this window another thread could free the multicast filter structure, leaving the handler with a stale pointer to freed memory.\n\nAn unprivileged local user can exploit this use-after-free to escalate privileges.","published_at":"2026-06-27T09:02:55.482000Z","last_modified_at":null,"cvss_v3_score":null,"cvss_v3_vector":null,"cvss_v3_severity":null,"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-416"],"nvd_references":["https://security.freebsd.org/advisories/FreeBSD-SA-26:29.ip6_multicast.asc"],"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":"2026-06-28T17:55:10.688071Z","updated_at":"2026-06-28T23:30:45.962068Z"},"effective_severity":null,"badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":null,"metrics":[]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"freebsd","vendor_name":"FreeBSD","product_slug":"freebsd","product_name":"FreeBSD","version_start":"15.0-RELEASE","version_start_inclusive":true,"version_end":"p10","version_end_inclusive":false,"cpe23_uri":"cve5:freebsd:freebsd:15.0-RELEASE:p10"},{"vendor_slug":"freebsd","vendor_name":"FreeBSD","product_slug":"freebsd","product_name":"FreeBSD","version_start":"14.4-RELEASE","version_start_inclusive":true,"version_end":"p6","version_end_inclusive":false,"cpe23_uri":"cve5:freebsd:freebsd:14.4-RELEASE:p6"},{"vendor_slug":"freebsd","vendor_name":"FreeBSD","product_slug":"freebsd","product_name":"FreeBSD","version_start":"14.3-RELEASE","version_start_inclusive":true,"version_end":"p15","version_end_inclusive":false,"cpe23_uri":"cve5:freebsd:freebsd:14.3-RELEASE:p15"}],"exploit_refs":[],"news":[],"references":[{"url":"https://security.freebsd.org/advisories/FreeBSD-SA-26:29.ip6_multicast.asc","source_type":"VENDOR_ADVISORY","tags":["advisory"]}],"timeline":[{"type":"published","at":"2026-06-27T09:02:55.482000Z","label":"CVE published","source":null}]}