{"id":"CVE-2026-57842","title":"NetBSD contains a use-after-free and double-free vulnerability in msg_recv_copyin() within the COMPAT_NETBSD32 compatibility layer due to a missing return statement before the cleanup label on the success path","summary":"NetBSD contains a use-after-free and double-free vulnerability in msg_recv_copyin() within the COMPAT_NETBSD32 compatibility layer due to a missing return statement before the cleanup label on the success path. Any local user able to exe…","severity":"high","cvss":7,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-415","CWE-416"],"vendor":"The NetBSD Foundation","product":"NetBSD","affected":["NetBSD >= 8.0 <= 8.3","NetBSD >= 9.0 < 9.5","NetBSD >= 10.0 <= 10.1"],"published":"2026-09-11","updated":"2026-09-11","sourceUpdated":"2026-09-11T15:17:02.313","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-57842","references":[{"url":"https://gnats.netbsd.org/60373","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/netbsd-compat-netbsd32-double-free-use-after-free-via-recvmsg-msg-iovlen","label":"disclosure@vulncheck.com"}],"tags":["nvd","cve.org"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-09-11T14:56:09.344902Z"},"ingestedAt":"2026-09-11T17:50:33.555Z","epss":0.00096,"epssPercentile":0.00816,"slug":"CVE-2026-57842","body":"## Overview\n\nNetBSD contains a use-after-free and double-free vulnerability in msg_recv_copyin() within the COMPAT_NETBSD32 compatibility layer due to a missing return statement before the cleanup label on the success path. Any local user able to execute a 32-bit binary on a 64-bit NetBSD system can trigger a kernel panic or memory corruption by calling recvmsg() with msg_iovlen between 9 and IOV_MAX, causing the kernel to access a freed iovec buffer and subsequently free the same allocation a second time.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":38.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}