Description
An issue was discovered in the Linux kernel before 5.19. In pxa3xx_gcu_write in drivers/video/fbdev/pxa3xx-gcu.c, the count parameter has a type conflict of size_t versus int, causing an integer overflow and bypassing the size check. After that, because it is used as the third argument to copy_from_user(), a heap overflow may occur. NOTE: the original discoverer disputes that the overflow can actually happen.
References (6)
Core 6
Core References
Release Notes, Vendor Advisory
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.19
Patch, Third Party Advisory
https://github.com/torvalds/linux/commit/a09d2d00af53b43c6f11e6ab3cb58443c2cac8a7
Mailing List, Third Party Advisory mailing-list
https://lists.debian.org/debian-lts-announce/2022/10/msg00000.html
Third Party Advisory vendor-advisory
https://www.debian.org/security/2022/dsa-5257
Mailing List, Third Party Advisory mailing-list
https://lists.debian.org/debian-lts-announce/2022/11/msg00001.html
Scores
CVSS v3
6.1
EPSS
0.0001
EPSS Percentile
0.8%
Attack Vector
LOCAL
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
Details
CWE
CWE-190
Status
published
Products (4)
debian/debian_linux
10.0
debian/debian_linux
11.0
linux/linux_kernel
5.19 rc1 (3 CPE variants)
linux/linux_kernel
< 5.19
Published
Sep 05, 2022
Tracked Since
Feb 18, 2026