{"id":"CVE-2026-49412","state":"PUBLISHED","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.","publishedAt":"2026-06-27T09:02:55.482Z","updatedAt":"2026-06-30T03:55:29.049Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"CISA-ADP"},"assigner":"freebsd","products":["FreeBSD FreeBSD"],"affected":[{"vendor":"FreeBSD","product":"FreeBSD","defaultStatus":"unknown","versions":[{"version":"15.0-RELEASE","status":"affected","lessThan":"p10","versionType":"release"},{"version":"14.4-RELEASE","status":"affected","lessThan":"p6","versionType":"release"},{"version":"14.3-RELEASE","status":"affected","lessThan":"p15","versionType":"release"}],"modules":["ip6_multicast"]}],"references":["https://security.freebsd.org/advisories/FreeBSD-SA-26:29.ip6_multicast.asc"],"weaknesses":["CWE-416"],"ingestedAt":"2026-10-29T20:12:07.131Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/49xxx/CVE-2026-49412.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-49412","state":"PUBLISHED","datePublished":"2026-06-27T09:02:55.482Z","dateUpdated":"2026-06-30T03:55:29.049Z","assignerShortName":"freebsd","assignerOrgId":"63664ac6-956c-4cba-a5d0-f46076e16109","dateReserved":"2026-05-29T20:24:28.615Z"},"containers":{"cna":{"title":"Use-after-free bug in the IPV6_MSFILTER socket option handler","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."}],"affected":[{"vendor":"FreeBSD","product":"FreeBSD","defaultStatus":"unknown","versions":[{"version":"15.0-RELEASE","status":"affected","lessThan":"p10","versionType":"release"},{"version":"14.4-RELEASE","status":"affected","lessThan":"p6","versionType":"release"},{"version":"14.3-RELEASE","status":"affected","lessThan":"p15","versionType":"release"}],"modules":["ip6_multicast"]}],"references":[{"url":"https://security.freebsd.org/advisories/FreeBSD-SA-26:29.ip6_multicast.asc","tags":["vendor-advisory"]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-416","description":"CWE-416: Use After Free","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"freebsd","orgId":"63664ac6-956c-4cba-a5d0-f46076e16109","dateUpdated":"2026-06-27T09:02:55.482Z"},"datePublic":"2026-06-09T23:30:00.000Z","credits":[{"lang":"en","type":"finder","value":"Andrew Griffiths at Calif.io"},{"lang":"en","type":"finder","value":"Maik Münch"}],"x_generator":{"engine":"cvelib 1.8.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":7.8,"attackVector":"LOCAL","baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","integrityImpact":"HIGH","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"LOW","confidentialityImpact":"HIGH"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-06-29T00:00:00+00:00","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3","id":"CVE-2026-49412"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-06-30T03:55:29.049Z"}}]}}}