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Vulnerability record · CVE-2021-3609 · published 3 March 2022

CVE-2021-3609: Linux kernel race condition vulnerability

Linux · Linux Kernel

.A flaw was found in the CAN BCM networking protocol in the Linux kernel, where a local attacker can abuse a flaw in the CAN subsystem to corrupt memory, crash the system or escalate privileges. This race condition in net/can/bcm.c in the Linux kernel allows for local privilege escalation to root.

7.0 CVSS 3.1 High EPSS 0.43% · top 65.1% CWE-362 · Race condition
7.0CVSS 3.1 base score, v2 6.9
0.43%EPSS exploitation probability, 30 days
NoNot in CISA KEV
32Affected product versions listed by NVD
10References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

.A flaw was found in the CAN BCM networking protocol in the Linux kernel, where a local attacker can abuse a flaw in the CAN subsystem to corrupt memory, crash the system or escalate privileges. This race condition in net/can/bcm.c in the Linux kernel allows for local privilege escalation to root.

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

Affected products

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

References

LinkTags
https://bugzilla.redhat.com/show_bug.cgi?id=1971651 Issue TrackingThird Party Advisory
https://github.com/nrb547/kernel-exploitation/blob/main/cve-2021-3609/cve-2021-3609.md ExploitTechnical DescriptionThird Party Advisory
https://github.com/torvalds/linux/commit/d5f9023fa61ee8b94f37a93f08e94b136cf1e463 PatchThird Party Advisory
https://security.netapp.com/advisory/ntap-20220419-0004/ Third Party Advisory
https://www.openwall.com/lists/oss-security/2021/06/19/1 Mailing ListThird Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1971651 Issue TrackingThird Party Advisory
https://github.com/nrb547/kernel-exploitation/blob/main/cve-2021-3609/cve-2021-3609.md ExploitTechnical DescriptionThird Party Advisory
https://github.com/torvalds/linux/commit/d5f9023fa61ee8b94f37a93f08e94b136cf1e463 PatchThird Party Advisory
https://security.netapp.com/advisory/ntap-20220419-0004/ Third Party Advisory
https://www.openwall.com/lists/oss-security/2021/06/19/1 Mailing ListThird Party Advisory

Track CVE-2021-3609 inside VULONE

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Source: NIST National Vulnerability Database (record CVE-2021-3609), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.