Race Condition Affecting kernel-devel package, versions <0:4.14.231-173.360.amzn2


Severity

Recommended
high

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.05% (16th percentile)

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  • Snyk IDSNYK-AMZN2-KERNELDEVEL-1698452
  • published27 Sept 2021
  • disclosed22 Mar 2021

Introduced: 22 Mar 2021

CVE-2021-28964  (opens in a new tab)
CWE-362  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2 kernel-devel to version 0:4.14.231-173.360.amzn2 or higher.
This issue was patched in ALAS2-2021-1627.

NVD Description

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

A race condition was discovered in get_old_root in fs/btrfs/ctree.c in the Linux kernel through 5.11.8. It allows attackers to cause a denial of service (BUG) because of a lack of locking on an extent buffer before a cloning operation, aka CID-dbcc7d57bffc.

CVSS Scores

version 3.1