HOMEVULNERABILITIESCVE-2021-3609
HIGH

CVE-2021-3609

CWE-362Published: March 3, 2022· Updated: Jun 17, 2026

7.0
CVSS v3.1

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.

NVD Source

Technical Analysis

CVE-2021-3609 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.0.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorLocal
Attack ComplexityHigh
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

Linux1 product(s)
linux kernel
netapp22 product(s)
h300s firmwareh300sh500s firmwareh500sh700s firmwareh700sh300e firmwareh300eh500e firmwareh500eh700e firmwareh700e+10
Red Hat20 product(s)
3scale api managementbuild of quarkuscodeready linux builder euscodeready linux builder for power little endian eusopenshift container platformvirtualizationvirtualization hostenterprise linux ausenterprise linux eusenterprise linux for ibm z systems eusenterprise linux for ibm z systems eus s390xenterprise linux for power little endian eus+8
Source: NVD CPE · 61 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

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

All References (10)

→
https://bugzilla.redhat.com/show_bug.cgi?id=1971651Issue Tracking · Third Party Advisory
→
https://github.com/nrb547/kernel-exploitation/blob/main/cve-2021-3609/cve-2021-3609.mdExploit · Technical Description · Third Party Advisory
→
https://github.com/torvalds/linux/commit/d5f9023fa61ee8b94f37a93f08e94b136cf1e463Patch · Third Party Advisory
→
https://security.netapp.com/advisory/ntap-20220419-0004/Third Party Advisory
→
https://www.openwall.com/lists/oss-security/2021/06/19/1Mailing List · Third Party Advisory
→
https://bugzilla.redhat.com/show_bug.cgi?id=1971651Issue Tracking · Third Party Advisory
→
https://github.com/nrb547/kernel-exploitation/blob/main/cve-2021-3609/cve-2021-3609.mdExploit · Technical Description · Third Party Advisory
→
https://github.com/torvalds/linux/commit/d5f9023fa61ee8b94f37a93f08e94b136cf1e463Patch · Third Party Advisory
→
https://security.netapp.com/advisory/ntap-20220419-0004/Third Party Advisory
→
https://www.openwall.com/lists/oss-security/2021/06/19/1Mailing List · Third Party Advisory

Quick Facts

CVE IDCVE-2021-3609
CVSS Score7.0 / 10
SeverityHIGH
WeaknessCWE-362
CISA KEVNo
Affected3 vendor(s)
PublishedMar 3, 2022

Related CVEs (CWE-362)

CVE-2015-8556
10.0
CVE-2014-0703
10.0
CVE-2008-6598
10.0
CVE-2025-66419
10.0
CVE-2010-1228
10.0
CVE-2020-1660
9.9

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-3609 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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