Use After Free Affecting kernel package, versions <0:4.14.214-118.339.amzn1


Severity

Recommended
high

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.1% (45th percentile)

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  • Snyk IDSNYK-AMZN201803-KERNEL-1725234
  • published27 Sept 2021
  • disclosed17 Dec 2019

Introduced: 17 Dec 2019

CVE-2019-19813  (opens in a new tab)
CWE-416  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2018.03 kernel to version 0:4.14.214-118.339.amzn1 or higher.
This issue was patched in ALAS-2021-1477.

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:2018.03 relevant fixed versions and status.

In the Linux kernel 5.0.21, mounting a crafted btrfs filesystem image, performing some operations, and then making a syncfs system call can lead to a use-after-free in __mutex_lock in kernel/locking/mutex.c. This is related to mutex_can_spin_on_owner in kernel/locking/mutex.c, __btrfs_qgroup_free_meta in fs/btrfs/qgroup.c, and btrfs_insert_delayed_items in fs/btrfs/delayed-inode.c.

CVSS Scores

version 3.1