CVE-2021-33656

When setting font with malicous data by ioctl cmd PIO_FONT,kernel will write memory out of bounds.

CVSS v3 6.8 MEDIUM

6.8^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 0.9 / Impact : 5.9

Attack Vector PHYSICAL

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
http://www.openwall.com/lists/oss-security/2022/07/19/3	Mailing List Patch Third Party Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git/tree/releases/5.10.127/vt-drop-old-font-ioctls.patch	Patch Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/10/msg00000.html	Mailing List Third Party Advisory
https://www.openeuler.org/en/security/cve/detail.html?id=CVE-2021-33656&packageName=kernel	Third Party Advisory
http://www.openwall.com/lists/oss-security/2022/07/19/3	Mailing List Patch Third Party Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git/tree/releases/5.10.127/vt-drop-old-font-ioctls.patch	Patch Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/10/msg00000.html	Mailing List Third Party Advisory
https://www.openeuler.org/en/security/cve/detail.html?id=CVE-2021-33656&packageName=kernel	Third Party Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:o:openatom:openeuler:20.03:-:::lts:::*
	cpe:2.3:o:openatom:openeuler:20.03:sp1:::lts:::*
	cpe:2.3:o:openatom:openeuler:20.03:sp3:::lts:::*

Configuration 2 (hide)

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

Configuration 3 (hide)

cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*

History

02 Apr 2025, 18:33

Type	Values Removed	Values Added
CPE	cpe:2.3:o:huawei:openeuler:20.03:sp3:::lts:::* cpe:2.3:o:huawei:openeuler:20.03:-:::lts:::* cpe:2.3:o:huawei:openeuler:20.03:sp1:::lts:::*	cpe:2.3:o:openatom:openeuler:20.03:sp3:::lts:::* cpe:2.3:o:openatom:openeuler:20.03:sp1:::lts:::* cpe:2.3:o:openatom:openeuler:20.03:-:::lts:::*
First Time		Openatom openeuler Openatom

Information

Published : 2022-07-18 15:15

Updated : 2025-04-02 18:33

NVD link : CVE-2021-33656

Mitre link : CVE-2021-33656

CVE.ORG link : CVE-2021-33656

JSON object : View

Products Affected

linux

linux_kernel

debian

debian_linux

openatom

openeuler

CWE

CWE-787

Out-of-bounds Write

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