CVE-2021-20317

low-risk
Published 2021-09-27

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.

Do I need to act?

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0.02% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
4
CVSS 4.4/10 Medium
LOCAL / LOW complexity

Affected Products (4)

Affected Vendors

Debian Linux

References (12)

Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=2005258
https://cert-portal.siemens.com/productcert/pdf/ssa-222547.pdf
Patch https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?id=511885d70...
Mailing List https://lists.debian.org/debian-lts-announce/2021/12/msg00012.html
Mailing List https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html
Third Party Advisory https://www.debian.org/security/2022/dsa-5096
Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=2005258
https://cert-portal.siemens.com/productcert/pdf/ssa-222547.pdf
Patch https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?id=511885d70...
Mailing List https://lists.debian.org/debian-lts-announce/2021/12/msg00012.html
Mailing List https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html
Third Party Advisory https://www.debian.org/security/2022/dsa-5096
25
/ 100
low-risk
Severity 15/34 · Moderate
Exploitability 0/34 · Minimal
Exposure 10/34 · Low