{"id":"CVE-2019-15239","details":"In the Linux kernel, a certain net/ipv4/tcp_output.c change, which was properly incorporated into 4.16.12, was incorrectly backported to the earlier longterm kernels, introducing a new vulnerability that was potentially more severe than the issue that was intended to be fixed by backporting. Specifically, by adding to a write queue between disconnection and re-connection, a local attacker can trigger multiple use-after-free conditions. This can result in a kernel crash, or potentially in privilege escalation. NOTE: this affects (for example) Linux distributions that use 4.9.x longterm kernels before 4.9.190 or 4.14.x longterm kernels before 4.14.139.","modified":"2026-03-15T22:27:12.127120Z","published":"2019-08-20T08:15:11.717Z","related":["SUSE-SU-2019:2412-1","SUSE-SU-2019:2414-1","SUSE-SU-2019:2424-1","SUSE-SU-2019:2648-1","SUSE-SU-2019:2651-1","SUSE-SU-2019:2658-1","SUSE-SU-2019:2738-1","SUSE-SU-2019:2756-1","SUSE-SU-2019:2949-1","SUSE-SU-2019:3215-1","SUSE-SU-2019:3228-1","SUSE-SU-2019:3230-1","SUSE-SU-2019:3249-1","SUSE-SU-2019:3258-1","openSUSE-SU-2019:2173-1","openSUSE-SU-2019:2181-1"],"references":[{"type":"WEB","url":"https://lore.kernel.org/stable/41a61a2f87691d2bc839f26cdfe6f5ff2f51e472.camel%40decadent.org.uk/"},{"type":"WEB","url":"http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00064.html"},{"type":"WEB","url":"http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00066.html"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2020:0027"},{"type":"ADVISORY","url":"https://salsa.debian.org/kernel-team/kernel-sec/blob/f6273af2d956a87296b6b60379d0a186c9be4bbc/active/CVE-2019-15239"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2019:3979"},{"type":"ADVISORY","url":"https://www.debian.org/security/2019/dsa-4497"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2019:3978"},{"type":"FIX","url":"https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7f582b248d0a86bae5788c548d7bb5bca6f7691a"},{"type":"EVIDENCE","url":"https://pulsesecurity.co.nz/advisories/linux-kernel-4.9-tcpsocketsuaf"}],"affected":[{"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2019-15239.json","unresolved_ranges":[{"events":[{"introduced":"0"},{"last_affected":"4.16.12"}]},{"events":[{"introduced":"0"},{"last_affected":"9.0"}]},{"events":[{"introduced":"0"},{"last_affected":"10.0"}]}]}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}