NULL Pointer Dereference Affecting kernel package, versions <0:4.14.106-97.85.amzn2


Severity

Recommended
high

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.08% (37th percentile)

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  • Snyk IDSNYK-AMZN2-KERNEL-1669386
  • published27 Sept 2021
  • disclosed5 Mar 2019

Introduced: 5 Mar 2019

CVE-2019-9213  (opens in a new tab)
CWE-476  (opens in a new tab)
First added by Snyk

How to fix?

Upgrade Amazon-Linux:2 kernel to version 0:4.14.106-97.85.amzn2 or higher.
This issue was patched in ALAS2-2019-1179.

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 before 4.20.14, expand_downwards in mm/mmap.c lacks a check for the mmap minimum address, which makes it easier for attackers to exploit kernel NULL pointer dereferences on non-SMAP platforms. This is related to a capability check for the wrong task.

References

CVSS Scores

version 3.1