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Use After Free Affecting kernel package, versions <0:4.9.81-44.57.amzn2

Severity

 Recommended
high

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.06% (30th percentile)

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  • Snyk IDSNYK-AMZN2-KERNEL-1661053
  • published27 Sept 2021
  • disclosed12 Jan 2018
Report a new vulnerability Found a mistake?

Introduced: 12 Jan 2018

CVE-2018-5344  (opens in a new tab)
CWE-416  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2 kernel to version 0:4.9.81-44.57.amzn2 or higher.
This issue was patched in ALAS2-2018-956.

NVD Description

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

In the Linux kernel through 4.14.13, drivers/block/loop.c mishandles lo_release serialization, which allows attackers to cause a denial of service (__lock_acquire use-after-free) or possibly have unspecified other impact.