CVE-2026-43256 Linux内核越界访问漏洞

/* * PoC for CVE-2026-43256 * This code demonstrates the logic flaw in the Linux kernel VFE driver. * It simulates the loop condition that causes the out-of-bounds access. * Note: Actual exploitation requires triggering the VFE interrupt on * vulnerable hardware. */ #include <stdio.h> #include <stdlib.h> // Definitions based on the vulnerable code #define MSM_VFE_IMAGE_MASTERS_NUM 7 #define VFE_LINE_NUM_MAX 4 struct vfe_line { int dummy; }; struct vfe_device { struct vfe_line line[VFE_LINE_NUM_MAX]; }; // Simulated vulnerable function void vfe_isr_reg_update(struct vfe_device *vfe, int line_id) { printf("Accessing line index: %d\n", line_id); // This access is out of bounds when line_id >= 4 // In the kernel, this corrupts memory. int x = vfe->line[line_id].dummy; } // Simulated interrupt handler void vfe_isr(struct vfe_device *vfe) { // Vulnerability: Loop bound is larger than the array size for (int i = 0; i < MSM_VFE_IMAGE_MASTERS_NUM; i++) { vfe_isr_reg_update(vfe, i); } } int main() { struct vfe_device *vfe = malloc(sizeof(struct vfe_device)); printf("Triggering vulnerable logic...\n"); vfe_isr(vfe); free(vfe); return 0; }