Detections
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CVE-2018-12232
medium
Description
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.
References
https://usn.ubuntu.com/3752-3/
https://usn.ubuntu.com/3752-2/
https://usn.ubuntu.com/3752-1/
https://patchwork.ozlabs.org/patch/926519/
https://lkml.org/lkml/2018/6/5/14
https://github.com/torvalds/linux/commit/6d8c50dcb029872b298eea68cc6209c866fd3e14
https://access.redhat.com/errata/RHSA-2018:2948