CVE-2021-33656

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

Score

CVSS 3.1 6.8 Medium

Status

Modified - securities@openeuler.org

Published

2022-07-18

Last modified

2026-10-08

Weaknesses

CWE-787

Affected products

• Debian Linux (Debian)
• Linux Kernel (Linux)
• Openeuler (Openatom)

References

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