What’s Vulnerable › Vulnerabilities

CVE-2021-3609

• Severity: high (CVSS 7.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2022-03-03 · updated 2026-06-17
• Weakness: CWE-362

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.

Affected products

• Linux kernel: from 2.6.25 before 4.4.276; from 4.5 before 4.9.276; from 4.10 before 4.14.240; from 4.15 before 4.19.198; from 4.20 before 5.4.132; from 5.5.0 before 5.10.50 — fixed in 4.14.240, 4.19.198, 4.4.276, 4.9.276, 5.10.50, 5.12.17
• NetApp H300E Firmware: all versions
• NetApp H300S Firmware: all versions
• NetApp H410C Firmware: all versions
• NetApp H410S Firmware: all versions
• NetApp H500E Firmware: all versions
• NetApp H500S Firmware: all versions
• NetApp H610C Firmware: all versions
• NetApp H610S Firmware: all versions
• NetApp H615C Firmware: all versions
• NetApp H700E Firmware: all versions
• NetApp H700S Firmware: all versions
• Red Hat 3scale API Management Platform 2: 2.0
• Red Hat build of Quarkus: 1.0
• RedHat Codeready Linux Builder Eus: 8.1, 8.2, 8.4
• RedHat Codeready Linux Builder For Power Little Endian Eus: 8.1, 8.2, 8.4
• RedHat Enterprise Linux Aus: 8.2
• RedHat Enterprise Linux Eus: 8.1, 8.2, 8.4
• RedHat Enterprise Linux For Ibm Z Systems Eus: 8.4
• RedHat Enterprise Linux For Ibm Z Systems Eus S390X: 8.1
• RedHat Enterprise Linux For Power Little Endian Eus: 8.1, 8.2, 8.4
• RedHat Enterprise Linux For Real Time: 8.0
• RedHat Enterprise Linux For Real Time For Nfv: 8.0
• RedHat Enterprise Linux For Real Time For Nfv Tus: 8.0, 8.2
• RedHat Enterprise Linux For Real Time Tus: 8.0, 8.2
• RedHat Enterprise Linux Server Aus: 8.2, 8.4
• RedHat Enterprise Linux Server For Power Little Endian Update Services For Sap Solutions: 8.1, 8.2, 8.4
• RedHat Enterprise Linux Server Tus: 8.2, 8.4
• RedHat Enterprise Linux Server Update Services For Sap Solutions: 8.1, 8.2, 8.4
• Red Hat OpenShift Container Platform 4.18: 4.6, 4.7, 4.8

How to fix

Upgrade to a fixed version: Linux kernel 4.14.240, 4.19.198, 4.4.276, 4.9.276. Check the vendor advisory for mitigations.

References

• https://bugzilla.redhat.com/show_bug.cgi?id=1971651
• https://github.com/nrb547/kernel-exploitation/blob/main/cve-2021-3609/cve-2021-3609.md
• https://github.com/torvalds/linux/commit/d5f9023fa61ee8b94f37a93f08e94b136cf1e463
• https://security.netapp.com/advisory/ntap-20220419-0004/
• https://www.openwall.com/lists/oss-security/2021/06/19/1
• https://bugzilla.redhat.com/show_bug.cgi?id=1971651
• https://github.com/nrb547/kernel-exploitation/blob/main/cve-2021-3609/cve-2021-3609.md
• https://github.com/torvalds/linux/commit/d5f9023fa61ee8b94f37a93f08e94b136cf1e463
• https://security.netapp.com/advisory/ntap-20220419-0004/
• https://www.openwall.com/lists/oss-security/2021/06/19/1

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