Race Condition Affecting kernel package, versions <0:4.14.252-195.481.amzn2
Threat Intelligence
EPSS
0.04% (6th
percentile)
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Test your applications- Snyk ID SNYK-AMZN2-KERNEL-1911183
- published 5 Nov 2021
- disclosed 18 Feb 2022
Introduced: 5 Nov 2021
CVE-2021-20321 Open this link in a new tabHow to fix?
Upgrade Amazon-Linux:2 kernel to version 0:4.14.252-195.481.amzn2 or higher.
This issue was patched in ALAS2-2021-1719.
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.
A race condition accessing file object in the Linux kernel OverlayFS subsystem was found in the way users do rename in specific way with OverlayFS. A local user could use this flaw to crash the system.
References
- http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-20321
- https://bugzilla.redhat.com/show_bug.cgi?id=2013242
- https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html
- https://lore.kernel.org/all/20211011134508.748956131@linuxfoundation.org/
- https://www.debian.org/security/2022/dsa-5096
- https://lore.kernel.org/all/20211011134508.748956131%40linuxfoundation.org/
CVSS Scores
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