CVE-2018-12232 Information

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.

CVSS Vector

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Reference

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=6d8c50dcb029872b298eea68cc6209c866fd3e14 http://www.securityfocus.com/bid/104453 https://access.redhat.com/errata/RHSA-2018:2948 https://github.com/torvalds/linux/commit/6d8c50dcb029872b298eea68cc6209c866fd3e14 https://lkml.org/lkml/2018/6/5/14 https://patchwork.ozlabs.org/patch/926519/ https://usn.ubuntu.com/3752-1/ https://usn.ubuntu.com/3752-2/ https://usn.ubuntu.com/3752-3/

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

5.9