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Vulnerability record · CVE-2021-3659 · published 22 August 2022

CVE-2021-3659: Linux kernel unchecked return value vulnerability

Linux · Linux Kernel

A NULL pointer dereference flaw was found in the Linux kernel’s IEEE 802.15.4 wireless networking subsystem in the way the user closes the LR-WPAN connection. This flaw allows a local user to crash the system. The highest threat from this vulnerability is to system availability.

5.5 CVSS 3.1 Medium EPSS 0.27% · top 82.4% CWE-252 · Unchecked return valueCWE-476 · NULL pointer dereference
5.5CVSS 3.1 base score
0.27%EPSS exploitation probability, 30 days
NoNot in CISA KEV
15Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

Description

A NULL pointer dereference flaw was found in the Linux kernel’s IEEE 802.15.4 wireless networking subsystem in the way the user closes the LR-WPAN connection. This flaw allows a local user to crash the system. The highest threat from this vulnerability is to system availability.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

15 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://access.redhat.com/security/cve/CVE-2021-3659 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1975949 Issue TrackingPatchThird Party Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1165affd484889d4986cf3b724318935a0b120d8 PatchVendor Advisory
https://access.redhat.com/security/cve/CVE-2021-3659 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1975949 Issue TrackingPatchThird Party Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1165affd484889d4986cf3b724318935a0b120d8 PatchVendor Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-3659), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.