{"api_version":"1","generated_at":"2026-06-27T18:32:14+00:00","cve":"CVE-2026-49412","urls":{"html":"https://cve.report/CVE-2026-49412","api":"https://cve.report/api/cve/CVE-2026-49412.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-49412","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-49412"},"summary":{"title":"Use-after-free bug in the IPV6_MSFILTER socket option handler","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.","state":"PUBLISHED","assigner":"freebsd","published_at":"2026-06-27 09:16:23","updated_at":"2026-06-27 09:16:23"},"problem_types":["CWE-416","CWE-416 CWE-416: Use After Free"],"metrics":[],"references":[{"url":"https://security.freebsd.org/advisories/FreeBSD-SA-26:29.ip6_multicast.asc","name":"https://security.freebsd.org/advisories/FreeBSD-SA-26:29.ip6_multicast.asc","refsource":"secteam@freebsd.org","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-49412","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-49412","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"FreeBSD","product":"FreeBSD","version":"affected 15.0-RELEASE p10 release","platforms":[]},{"source":"CNA","vendor":"FreeBSD","product":"FreeBSD","version":"affected 14.4-RELEASE p6 release","platforms":[]},{"source":"CNA","vendor":"FreeBSD","product":"FreeBSD","version":"affected 14.3-RELEASE p15 release","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[{"source":"CNA","value":"Andrew Griffiths at Calif.io","lang":"en"},{"source":"CNA","value":"Maik Münch","lang":"en"}],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unknown","modules":["ip6_multicast"],"product":"FreeBSD","vendor":"FreeBSD","versions":[{"lessThan":"p10","status":"affected","version":"15.0-RELEASE","versionType":"release"},{"lessThan":"p6","status":"affected","version":"14.4-RELEASE","versionType":"release"},{"lessThan":"p15","status":"affected","version":"14.3-RELEASE","versionType":"release"}]}],"credits":[{"lang":"en","type":"finder","value":"Andrew Griffiths at Calif.io"},{"lang":"en","type":"finder","value":"Maik Münch"}],"datePublic":"2026-06-09T23:30:00.000Z","descriptions":[{"lang":"en","value":"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."}],"problemTypes":[{"descriptions":[{"cweId":"CWE-416","description":"CWE-416: Use After Free","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-06-27T09:02:55.482Z","orgId":"63664ac6-956c-4cba-a5d0-f46076e16109","shortName":"freebsd"},"references":[{"tags":["vendor-advisory"],"url":"https://security.freebsd.org/advisories/FreeBSD-SA-26:29.ip6_multicast.asc"}],"title":"Use-after-free bug in the IPV6_MSFILTER socket option handler","x_generator":{"engine":"cvelib 1.8.0"}}},"cveMetadata":{"assignerOrgId":"63664ac6-956c-4cba-a5d0-f46076e16109","assignerShortName":"freebsd","cveId":"CVE-2026-49412","datePublished":"2026-06-27T09:02:55.482Z","dateReserved":"2026-05-29T20:24:28.615Z","dateUpdated":"2026-06-27T09:02:55.482Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-06-27 09:16:23","lastModifiedDate":"2026-06-27 09:16:23","problem_types":["CWE-416","CWE-416 CWE-416: Use After Free"],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"49412","Ordinal":"1","Title":"Use-after-free bug in the IPV6_MSFILTER socket option handler","CVE":"CVE-2026-49412","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"49412","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"Use-after-free bug in the IPV6_MSFILTER socket option handler"}]}}}