CVE-2021-3609 Race condition in kernel

What is CVE-2021-3609?

CVE-2021-3609 is a high-severity vulnerability in Linux kernel, published on 3 Mar 2022. It can only be exploited from the same machine or local network, with no action from the victim.

Official 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.

Weakness: CWE-362

Which versions are affected by CVE-2021-3609?

It affects 32 products.

Products include Linux kernel, Netapp H300e Firmware, Netapp H300s Firmware, Netapp H410c Firmware, Netapp H410s Firmware, Netapp H500e Firmware and 26 more.

How do I fix CVE-2021-3609?

Apply the vendor's patch.

Is CVE-2021-3609 being exploited?

There is no known exploitation of CVE-2021-3609 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as A-223967238, DEBIAN-CVE-2021-3609, GHSA-rv9w-mxpp-hwhj, LSN-0078-1, PUB-A-223967238, UBUNTU-CVE-2021-3609 and 1 more.