PT-2026-42454 · Linux · Linux Kernel
CVE-2026-43497
·
Published
2026-05-03
·
Updated
2026-07-29
CVSS v3.1
7.3
High
| Vector | AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H |
Name of the Vulnerable Software and Affected Versions
Linux kernel (affected versions not specified)
Description
A use-after-free issue exists in the
udlfb component of the fbdev subsystem. The dlfb ops mmap() function uses remap pfn range() to map vmalloc framebuffer pages to userspace without setting vm ops on the VMA, preventing the kernel from tracking active mmaps. Consequently, when dlfb realloc framebuffer() replaces the backing buffer via FBIOPUT VSCREENINFO, existing mmap PTEs (Page Table Entries) are not invalidated. Upon USB disconnect, dlfb ops destroy() calls vfree() on the old pages while userspace PTEs still reference them, allowing a process to retain read/write access to freed kernel pages.Recommendations
At the moment, there is no information about a newer version that contains a fix for this vulnerability.
Exploit
Use After Free
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Weakness Enumeration
Related Identifiers
Affected Products
Linux Kernel