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

http://www.securityfocus.com/bid/104453

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=6d8c50dcb029872b298eea68cc6209c866fd3e14

Details

Source: Mitre, NVD

Published: 2018-06-12

Updated: 2018-10-31

Risk Information

CVSS v2

Base Score: 7.1

Vector: CVSS2#AV:N/AC:M/Au:N/C:N/I:N/A:C

Severity: High

CVSS v3

Base Score: 5.9

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

Severity: Medium