CVE-2018-12232

HIGH

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

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/

Details

Source: MITRE

Published: 2018-06-12

Updated: 2018-10-31

Type: CWE-362

Risk Information

CVSS v2.0

Base Score: 7.1

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

Impact Score: 6.9

Exploitability Score: 8.6

Severity: HIGH

CVSS v3.0

Base Score: 5.9

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

Impact Score: 3.6

Exploitability Score: 2.2

Severity: MEDIUM