Loop with Unreachable Exit Condition ('Infinite Loop') Affecting kernel-rt-debug-modules-extra package, versions <0:4.18.0-80.7.1.rt9.153.el8_0


Severity

Recommended
high

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
1.46% (88th percentile)

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  • Snyk IDSNYK-RHEL8-KERNELRTDEBUGMODULESEXTRA-3432305
  • published26 Jul 2021
  • disclosed28 Dec 2018

Introduced: 28 Dec 2018

CVE-2018-20784  (opens in a new tab)
CWE-835  (opens in a new tab)

How to fix?

Upgrade RHEL:8 kernel-rt-debug-modules-extra to version 0:4.18.0-80.7.1.rt9.153.el8_0 or higher.
This issue was patched in RHSA-2019:1971.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-rt-debug-modules-extra package and not the kernel-rt-debug-modules-extra package as distributed by RHEL. See How to fix? for RHEL:8 relevant fixed versions and status.

In the Linux kernel before 4.20.2, kernel/sched/fair.c mishandles leaf cfs_rq's, which allows attackers to cause a denial of service (infinite loop in update_blocked_averages) or possibly have unspecified other impact by inducing a high load.

CVSS Scores

version 3.1