Medium severity4.4NVD Advisory· Published Sep 27, 2021· Updated Jun 17, 2026

CVE-2021-20317

Description

A flaw was found in the Linux kernel. A corrupted timer tree caused the task wakeup to be missing in the timerqueue_add function in lib/timerqueue.c. This flaw allows a local attacker with special user privileges to cause a denial of service, slowing and eventually stopping the system while running OSP.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Linux/Kernelllm-fuzzy3 versions
(expand)+ 2 more
- (no CPE)
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*range: <5.4
- cpe:2.3:o:linux:linux_kernel:5.4:-:*:*:*:*:*:*
Linux/Linux kerneldescription
osv-coords
pkg:rpm/almalinux/kernel-tools-libs-devel
Range: < 4.18.0-348.2.1.el8_5
Debian/linux2 versions
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*

Patches

Vulnerability mechanics

References

git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/nvdPatchVendor Advisory
bugzilla.redhat.com/show_bug.cginvdIssue TrackingThird Party Advisory
lists.debian.org/debian-lts-announce/2021/12/msg00012.htmlnvdMailing ListThird Party Advisory
lists.debian.org/debian-lts-announce/2022/03/msg00012.htmlnvdMailing ListThird Party Advisory
www.debian.org/security/2022/dsa-5096nvdThird Party Advisory
cert-portal.siemens.com/productcert/pdf/ssa-222547.pdfnvd

News mentions

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cvss	0.286
epss	0.000
exploit	0.000
kev	0.000
patch	-0.070
ransomware	0.000