{"id":"UBUNTU-CVE-2018-12232","details":"In net/socket.c in the Linux kernel through 4.17.1, there is a race condition between fchownat and close in cases where they target the same socket file descriptor, related to the sock_close and sockfs_setattr functions. fchownat does not increment the file descriptor reference count, which allows close to set the socket to NULL during fchownat's execution, leading to a NULL pointer dereference and system crash.","modified":"2026-01-30T01:05:50.982127Z","published":"2018-06-12T00:00:00Z","related":["USN-3752-1","USN-3752-2","USN-3752-3"],"upstream":["CVE-2018-12232"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2018-12232"},{"type":"REPORT","url":"http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=6d8c50dcb029872b298eea68cc6209c866fd3e14"},{"type":"REPORT","url":"https://github.com/torvalds/linux/commit/6d8c50dcb029872b298eea68cc6209c866fd3e14"},{"type":"REPORT","url":"https://lkml.org/lkml/2018/6/5/14"},{"type":"REPORT","url":"https://patchwork.ozlabs.org/patch/926519/"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-3752-1"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-3752-2"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-3752-3"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2018-12232"}],"affected":[{"package":{"name":"linux-azure","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/linux-azure@4.15.0-1022.22~16.04.1?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.15.0-1022.22~16.04.1"}]}],"versions":["4.11.0-1009.9","4.11.0-1011.11","4.11.0-1013.13","4.11.0-1014.14","4.11.0-1015.15","4.11.0-1016.16","4.13.0-1005.7","4.13.0-1006.8","4.13.0-1007.9","4.13.0-1009.12","4.13.0-1011.14","4.13.0-1012.15","4.13.0-1014.17","4.13.0-1016.19","4.13.0-1018.21","4.15.0-1013.13~16.04.2","4.15.0-1014.14~16.04.1","4.15.0-1018.18~16.04.1","4.15.0-1019.19~16.04.1","4.15.0-1021.21~16.04.1"],"ecosystem_specific":{"availability":"No 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