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Vulnerability · Published Sep 27, 2021 · Assigned by redhat

CVE-2021-20317

Medium 4.4

In plain English

A medium-severity security flaw in kernel. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 32% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)4.4Medium
Exploit odds (30 days)0.4%top 67.6% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:8kernel-tools-libs-devel4.18.0-348.2.1.el8_5ALSA-2021:4647
Debian:12linux5.4.6-1DEBIAN-CVE-2021-20317
Debian:13linux5.4.6-1DEBIAN-CVE-2021-20317
Debian:14linux5.4.6-1DEBIAN-CVE-2021-20317
Rocky Linux:8kernel0:4.18.0-348.2.1.el8_5RLSA-2021:4647
Rocky Linux:8kernel-rt0:4.18.0-348.2.1.rt7.132.el8_5RLSA-2021:4646
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2021-20317
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2021-20317
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2021-20317

Affected products (as reported)

VendorProductVersions
n/a kernel Kernel 5.3 rc1

Weakness: CWE-665

References