CVE-2026-49412

{"id": "CVE-2026-49412", "cveTags": [], "metrics": {}, "affected": [{"source": "secteam@freebsd.org", "affectedData": [{"vendor": "FreeBSD", "modules": ["ip6_multicast"], "product": "FreeBSD", "versions": [{"status": "affected", "version": "15.0-RELEASE", "lessThan": "p10", "versionType": "release"}, {"status": "affected", "version": "14.4-RELEASE", "lessThan": "p6", "versionType": "release"}, {"status": "affected", "version": "14.3-RELEASE", "lessThan": "p15", "versionType": "release"}], "defaultStatus": "unknown"}]}], "published": "2026-06-27T09:16:23.937", "references": [{"url": "https://security.freebsd.org/advisories/FreeBSD-SA-26:29.ip6_multicast.asc", "source": "secteam@freebsd.org"}], "vulnStatus": "Received", "weaknesses": [{"type": "Secondary", "source": "secteam@freebsd.org", "description": [{"lang": "en", "value": "CWE-416"}]}], "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."}], "lastModified": "2026-06-27T09:16:23.937", "sourceIdentifier": "secteam@freebsd.org"}