CVE-2026-43497

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/write access to freed kernel pages. Add vm_operations_struct with open/close callbacks that maintain an atomic mmap_count on struct dlfb_data. In dlfb_realloc_framebuffer(), check mmap_count and return -EBUSY if the buffer is currently mapped, preventing buffer replacement while userspace holds stale PTEs. Tested with PoC using dummy_hcd + raw_gadget USB device emulation.

• CWE-416

• https://git.kernel.org/stable/c/18dd358de72d57993422cbb5dfb29ccd74efe192Patch
• https://git.kernel.org/stable/c/4f312c30f0368e8d2a76aa650dff73f23490b5e7Patch
• https://git.kernel.org/stable/c/5931f5651ee32bd41b3323256b31fcc8e71336edPatch
• https://git.kernel.org/stable/c/60f711cfd580f86fea8284146ac133804e728f9aPatch
• https://git.kernel.org/stable/c/8de779dc40d35d39fa07387b6f921eb11df0f511Patch
• https://git.kernel.org/stable/c/a2c53a3822ee26e8d758071815b9ed3bf6669fc1Patch
• https://git.kernel.org/stable/c/da9b065cedfd3b574f229d5be594e6aa47a27ae6Patch
• https://git.kernel.org/stable/c/e3d9865dacd7435b8465848428210d0f0c673311Patch

Published

May 21, 2026

Last Modified

Jul 23, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2026-43491In the Linux kernel, the following vulnerability has been re…5.5
• CVE-2026-43492In the Linux kernel, the following vulnerability has been re…5.5
• CVE-2026-43493In the Linux kernel, the following vulnerability has been re…9.8
• CVE-2026-43494In the Linux kernel, the following vulnerability has been re…7.8
• CVE-2026-43495In the Linux kernel, the following vulnerability has been re…8.8
• CVE-2026-43496In the Linux kernel, the following vulnerability has been re…5.5
• CVE-2026-43498In the Linux kernel, the following vulnerability has been re…7.8
• CVE-2026-43499In the Linux kernel, the following vulnerability has been re…7.8
• CVE-2026-4350The Perfmatters plugin for WordPress is vulnerable to arbitr…8.1
• CVE-2026-43500In the Linux kernel, the following vulnerability has been re…7.8
• CVE-2026-43501In the Linux kernel, the following vulnerability has been re…9.8
• CVE-2026-43502In the Linux kernel, the following vulnerability has been re…7.8