CVE-2026-43205 Linux内核越界写入漏洞

/* * Conceptual PoC for CVE-2026-43205 * This simulates the missing bounds check in dpaa2-switch driver. */ #include <stdio.h> #include <string.h> #define DPSW_MAX_IF 64 struct dpsw_attr { int num_ifs; }; struct fdb_cfg { int if_id[DPSW_MAX_IF]; }; // Simulating the vulnerable function dpaa2_switch_fdb_get_flood_cfg void vulnerable_flood_cfg(struct dpsw_attr *sw_attr, struct fdb_cfg *cfg) { // Vulnerability: No check for sw_attr->num_ifs >= DPSW_MAX_IF for (int i = 0; i < sw_attr->num_ifs; i++) { // This writes past the array if num_ifs >= 64 cfg->if_id[i] = i; printf("Writing index %d\n", i); } // The code appends the control interface here // If num_ifs == 64, this writes to cfg->if_id[64] (Out of bounds) cfg->if_id[sw_attr->num_ifs] = 0xFFFF; printf("Writing control interface at index %d\n", sw_attr->num_ifs); } int main() { struct dpsw_attr malicious_attr; struct fdb_cfg cfg; // Initialize memory to detect overflow memset(&cfg, 0x41, sizeof(cfg)); // Simulate firmware reporting a value >= 64 malicious_attr.num_ifs = 64; printf("[+] Triggering PoC with num_ifs = %d\n", malicious_attr.num_ifs); vulnerable_flood_cfg(&malicious_attr, &cfg); printf("[-] Exploit finished. Memory corruption occurred at if_id[64].\n"); return 0; }