Loop with Unreachable Exit Condition ('Infinite Loop') Affecting perf package, versions <0:4.18.0-80.7.1.el8_0
Threat Intelligence
EPSS
1.46% (88th
percentile)
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Test your applications- Snyk ID SNYK-RHEL8-PERF-3443400
- published 26 Jul 2021
- disclosed 28 Dec 2018
Introduced: 28 Dec 2018
CVE-2018-20784 Open this link in a new tabHow to fix?
Upgrade RHEL:8 perf to version 0:4.18.0-80.7.1.el8_0 or higher.
This issue was patched in RHSA-2019:1959.
NVD Description
Note: Versions mentioned in the description apply only to the upstream perf package and not the perf 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.
References
- https://access.redhat.com/security/cve/CVE-2018-20784
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=c40f7d74c741a907cfaeb73a7697081881c497d0
- https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.20.2
- https://github.com/torvalds/linux/commit/c40f7d74c741a907cfaeb73a7697081881c497d0
- https://access.redhat.com/errata/RHSA-2019:1959
- https://usn.ubuntu.com/4115-1/
- https://usn.ubuntu.com/4118-1/
- https://usn.ubuntu.com/4211-1/
- https://usn.ubuntu.com/4211-2/
CVSS Scores
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