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Access Restriction Bypass Affecting kernel-tools-debuginfo package, versions <0:4.1.19-24.31.amzn1

Severity

 Recommended
medium

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.06% (30th percentile)

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  • Snyk IDSNYK-AMZN201803-KERNELTOOLSDEBUGINFO-1694285
  • published27 Sept 2021
  • disclosed12 Apr 2016
Report a new vulnerability Found a mistake?

Introduced: 12 Apr 2016

CVE-2016-3157  (opens in a new tab)
CWE-264  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2018.03 kernel-tools-debuginfo to version 0:4.1.19-24.31.amzn1 or higher.
This issue was patched in ALAS-2016-669.

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:2018.03 relevant fixed versions and status.

The __switch_to function in arch/x86/kernel/process_64.c in the Linux kernel does not properly context-switch IOPL on 64-bit PV Xen guests, which allows local guest OS users to gain privileges, cause a denial of service (guest OS crash), or obtain sensitive information by leveraging I/O port access.