Use After Free Affecting kernel-tools-debuginfo package, versions <0:4.14.209-160.335.amzn2


Severity

Recommended
high

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
2.45% (83rd percentile)

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  • Snyk IDSNYK-AMZN2-KERNELTOOLSDEBUGINFO-1691513
  • published27 Sept 2021
  • disclosed12 Dec 2019

Introduced: 12 Dec 2019

CVE-2019-19770  (opens in a new tab)
CWE-416  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2 kernel-tools-debuginfo to version 0:4.14.209-160.335.amzn2 or higher.
This issue was patched in ALAS2-2020-1566.

NVD Description

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

In the Linux kernel 4.19.83, there is a use-after-free (read) in the debugfs_remove function in fs/debugfs/inode.c (which is used to remove a file or directory in debugfs that was previously created with a call to another debugfs function such as debugfs_create_file). NOTE: Linux kernel developers dispute this issue as not being an issue with debugfs, instead this is an issue with misuse of debugfs within blktrace

CVSS Base Scores

version 3.1