CVE-2021-33656
Moderate
CVE-2021-33656
When setting font with malicous data by ioctl cmd PIO_FONT,kernel will write memory out of bounds.
Exploit probability
0.6%
Published
July 18, 2022
Required by
Not available
Last source change
March 14, 2026
02 / AFFECTED SOFTWARE
Affected packages
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
Open Source Vulnerabilities
CVE-2021-33656
View original source
When setting font with malicous data by ioctl cmd PIO_FONT,kernel will write memory out of bounds.
05 / REFERENCES
Further evidence
- http://www.openwall.com/lists/oss-security/2022/07/19/3
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git/tree/releases/5.10.127/vt-drop-old-font-ioctls.patch
- https://lists.debian.org/debian-lts-announce/2022/10/msg00000.html
- https://www.openeuler.org/en/security/cve/detail.html?id=CVE-2021-33656&packageName=kernel