CVE-2026-43497

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: fbdev: udlfb: add vm_ops to dlfb_ops_mmap to prevent use-after-free dlfb_ops_mmap() uses remap_pfn_range() to map vmalloc framebuffer pages to userspace but sets no vm_ops on the VMA. This means the kernel cannot track active mmaps. When dlfb_realloc_framebuffer() replaces the backing buffer via FBIOPUT_VSCREENINFO, existing mmap PTEs are not invalidated. On USB disconnect, dlfb_ops_destroy() calls vfree() on the old pages while userspace PTEs still reference them, resulting in a use-after-free: the process retains read/wri...

Affected product and versions

Product

Linux Linux, linux kernel

Affected versions

>= 7433914efd584b22bb49d3e1eee001f5d0525ecd < 60f711cfd580f86fea8284146ac133804e728f9a, >= 7433914efd584b22bb49d3e1eee001f5d0525ecd < 5931f5651ee32bd41b3323256b31fcc8e71336ed, >= 7433914efd584b22bb49d3e1eee001f5d0525ecd < e3d9865dacd7435b8465848428210d0f0c673311, >= 7433914efd584b22bb49d3e1eee001f5d0525ecd < 4f312c30f0368e8d2a76aa650dff73f23490b5e7, >= 7433914efd584b22bb49d3e1eee001f5d0525ecd < 18dd358de72d57993422cbb5dfb29ccd74efe192, >= 7433914efd584b22bb49d3e1eee001f5d0525ecd < da9b065cedfd3b574f229d5be594e6aa47a27ae6, >= 7433914efd584b22bb49d3e1eee001f5d0525ecd < a2c53a3822ee26e8d758071815b9ed3bf6669fc1, >= 7433914efd584b22bb49d3e1eee001f5d0525ecd < 8de779dc40d35d39fa07387b6f921eb11df0f511, >= 4.19, >= 4.19 < 5.10.258, >= 5.11 < 5.15.209, >= 5.16 < 6.1.175, >= 6.2 < 6.6.140, >= 6.7 < 6.12.88, >= 6.13 < 6.18.30, >= 6.19 < 7.0.7, 7.1

Fixed versions

5.10.258, 5.15.209, 6.1.175, 6.6.140, 6.12.88, 6.18.30, 7.0.7

Technical data

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

CWE

CWE-416