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Race Condition Affecting kernel-tools-devel package, versions <0:4.14.51-66.38.amzn2

Severity

 Recommended
0.0
medium
0
10

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.59% (80th percentile)

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  • Snyk IDSNYK-AMZN2-KERNELTOOLSDEVEL-1663312
  • published27 Sept 2021
  • disclosed12 Jun 2018
Report a new vulnerability Found a mistake?

Introduced: 12 Jun 2018

CVE-2018-12232  (opens in a new tab)
CWE-362  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2 kernel-tools-devel to version 0:4.14.51-66.38.amzn2 or higher.
This issue was patched in ALAS2-2018-1044.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-tools-devel package and not the kernel-tools-devel package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2 relevant fixed versions and status.

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.