PT-2024-14594 · Linux+9 · Linux Kernel+9
Ville Syrjälä
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Published
2023-12-23
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Updated
2025-09-29
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CVE-2023-52486
CVSS v3.1
5.5
Medium
| Vector | AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
Name of the Vulnerable Software and Affected Versions
Linux kernel (affected versions not specified)
Description
The issue arises from a deadlock handling mistake in the Linux kernel, specifically in the
drm mode page flip ioctl() function. When a deadlock occurs after the framebuffer lookup, the kernel proceeds to unref the framebuffer and then retries the process. However, it forgets to reset the framebuffer pointer back to NULL, leading to the possibility of unreferencing the same framebuffer multiple times without obtaining another reference. This can result in the framebuffer being freed while still in use. The problem is exacerbated when doing async flips on a DG2 with CONFIG DEBUG WW MUTEX SLOWPATH=y enabled. Symptoms include drm closefb() getting stuck in a busy loop while walking the framebuffer list.Recommendations
At the moment, there is no information about a newer version that contains a fix for this vulnerability.
Exploit
DoS
Improper Locking
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Related Identifiers
Affected Products
Almalinux
Astra Linux
Centos
Linuxmint
Linux Kernel
Red Hat
Red Os
Rocky Linux
Suse
Ubuntu