HOMEVULNERABILITIESCVE-2021-3612
HIGH

CVE-2021-3612

CWE-20Published: July 9, 2021· Updated: Jun 17, 2026

7.8
CVSS v3.1

Official Description

An out-of-bounds memory write flaw was found in the Linux kernel's joystick devices subsystem in versions before 5.9-rc1, in the way the user calls ioctl JSIOCSBTNMAP. This flaw allows a local user to crash the system or possibly escalate their privileges on the system. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.

NVD Source

Technical Analysis

CVE-2021-3612 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 7.8.

CVSS v3.1 Vector Breakdown

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

Affected Vendors & Products

Debian1 product(s)
debian linux
Fedora1 product(s)
fedora
Linux1 product(s)
linux kernel
netapp19 product(s)
cloud backupsolidfire baseboard management controller firmwaresolidfire baseboard management controllerh300s firmwareh300sh500s firmwareh500sh700s firmwareh700sh300e firmwareh300eh500e firmware+7
Oracle3 product(s)
communications cloud native core binding support functioncommunications cloud native core network exposure functioncommunications cloud native core policy
Red Hat1 product(s)
enterprise linux
Source: NVD CPE · 27 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://www.oracle.com/security-alerts/cpujul2022.html
PATCHhttps://www.oracle.com/security-alerts/cpujul2022.html
ADVISORYhttps://bugzilla.redhat.com/show_bug.cgi?id=1974079
ADVISORYhttps://lists.debian.org/debian-lts-announce/2021/10/msg00010.html
ADVISORYhttps://lists.debian.org/debian-lts-announce/2021/12/msg00012.html
ADVISORYhttps://security.netapp.com/advisory/ntap-20210805-0005/
ADVISORYhttps://bugzilla.redhat.com/show_bug.cgi?id=1974079
ADVISORYhttps://lists.debian.org/debian-lts-announce/2021/10/msg00010.html
ADVISORYhttps://lists.debian.org/debian-lts-announce/2021/12/msg00012.html
ADVISORYhttps://security.netapp.com/advisory/ntap-20210805-0005/

All References (14)

→
https://bugzilla.redhat.com/show_bug.cgi?id=1974079Issue Tracking · Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2021/10/msg00010.htmlMailing List · Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2021/12/msg00012.htmlMailing List · Third Party Advisory
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YKGI562LFV5MESTMVTCG5RORSBT6NGBN/
→
https://lore.kernel.org/linux-input/20210620120030.1513655-1-avlarkin82%40gmail.com/
→
https://security.netapp.com/advisory/ntap-20210805-0005/Third Party Advisory
→
https://www.oracle.com/security-alerts/cpujul2022.htmlPatch · Third Party Advisory
→
https://bugzilla.redhat.com/show_bug.cgi?id=1974079Issue Tracking · Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2021/10/msg00010.htmlMailing List · Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2021/12/msg00012.htmlMailing List · Third Party Advisory
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YKGI562LFV5MESTMVTCG5RORSBT6NGBN/
→
https://lore.kernel.org/linux-input/20210620120030.1513655-1-avlarkin82%40gmail.com/
→
https://security.netapp.com/advisory/ntap-20210805-0005/Third Party Advisory
→
https://www.oracle.com/security-alerts/cpujul2022.htmlPatch · Third Party Advisory

Quick Facts

CVE IDCVE-2021-3612
CVSS Score7.8 / 10
SeverityHIGH
WeaknessCWE-20
CISA KEVNo
Affected6 vendor(s)
PublishedJul 9, 2021

Related CVEs (CWE-20)

CVE-2008-4910
10.0
CVE-2009-1361
10.0
CVE-2013-1710
10.0
CVE-2008-0244
10.0
CVE-2009-1669
10.0
CVE-2008-4509
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-3612 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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