High severity · published Mar 3, 2022
CVE-2021-3609
.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…
7.0
CVSS
0.4%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Local
Complexity
High
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 37% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
KE
Kernel · Linux
2.6.25 before 4.4.276; 4.5 before 4.9.276; 4.10 before 4.14.240; 4.15 before 4.19.198; 4.20 before 5.4.132; 5.5.0 before 5.10.50; +2 more · source: NVD
3A
3scale Api Management · Redhat
2.0 · source: NVD
BO
Build OF Quarkus · Redhat
1.0 · source: NVD
CL
Codeready Linux Builder Eus · Redhat
8.1; 8.2; 8.4 · source: NVD
CL
Codeready Linux Builder For Power Little Endian Eus · Redhat
8.1; 8.2; 8.4 · source: NVD
EL
Enterprise Linux Aus · Redhat
8.2 · source: NVD
EL
Enterprise Linux Eus · Redhat
8.1; 8.2; 8.4 · source: NVD
EL
Enterprise Linux For Ibm Z Systems Eus · Redhat
8.4 · source: NVD
EL
Enterprise Linux For Ibm Z Systems Eus S390x · Redhat
8.1 · source: NVD
EL
Enterprise Linux For Power Little Endian Eus · Redhat
8.1; 8.2; 8.4 · source: NVD
EL
Enterprise Linux For Real Time · Redhat
8.0 · source: NVD
EL
Enterprise Linux For Real Time For Nfv · Redhat
8.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-3609
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-3609
Issue Tracking
https://bugzilla.redhat.com/show_bug.cgi?id=1971651
Exploit
https://github.com/nrb547/kernel-exploitation/blob/main/cve-2021-3609/cve-2021-3609.md
Patch
https://github.com/torvalds/linux/commit/d5f9023fa61ee8b94f37a93f08e94b136cf1e463
Third Party Advisory
https://security.netapp.com/advisory/ntap-20220419-0004/
Mailing List
https://www.openwall.com/lists/oss-security/2021/06/19/1
More from Kernel
9.8
CVE-2025-39682
tls: fix handling of zero-length records on the rx_list
8.8
CVE-2026-53266
netfilter: bridge: make ebt_snat ARP rewrite writable
8.8
CVE-2013-6282
Linux Kernel Improper Input Validation Vulnerability
8.4
CVE-2022-0185
Linux Kernel Heap-Based Buffer Overflow Vulnerability
8.4
CVE-2013-2094
Linux Kernel Privilege Escalation Vulnerability