CVE-2016-4557 Affecting kernel package, versions <0:4.4.10-22.54.amzn1


Severity

Recommended
medium

Based on Amazon Linux security rating.

Threat Intelligence

Exploit Maturity
Mature
EPSS
0.09% (40th percentile)

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  • Snyk IDSNYK-AMZN201803-KERNEL-1697862
  • published27 Sept 2021
  • disclosed23 May 2016

Introduced: 23 May 2016

CVE-2016-4557  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2018.03 kernel to version 0:4.4.10-22.54.amzn1 or higher.
This issue was patched in ALAS-2016-703.

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.

The replace_map_fd_with_map_ptr function in kernel/bpf/verifier.c in the Linux kernel before 4.5.5 does not properly maintain an fd data structure, which allows local users to gain privileges or cause a denial of service (use-after-free) via crafted BPF instructions that reference an incorrect file descriptor.

CVSS Scores

version 3.1