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Vulnerability record · CVE-2021-3612 · published 9 July 2021

CVE-2021-3612: Linux kernel improper input validation vulnerability

Linux · Linux Kernel

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.

7.8 CVSS 3.1 High EPSS 0.69% · top 49.2% CWE-20 · Improper input validationCWE-787 · Out-of-bounds write
7.8CVSS 3.1 base score, v2 7.2
0.69%EPSS exploitation probability, 30 days
NoNot in CISA KEV
17Affected product versions listed by NVD
14References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

17 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://bugzilla.redhat.com/show_bug.cgi?id=1974079 Issue TrackingThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/10/msg00010.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/12/msg00012.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YKGI562LFV5MESTMVTCG5RO
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.html PatchThird Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1974079 Issue TrackingThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/10/msg00010.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/12/msg00012.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YKGI562LFV5MESTMVTCG5RO
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.html PatchThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2021-3612), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.