d3kheap2pro-revenge

d3c2026

Task: Linux 7.1.4 kernel-pwn revenge variant; isolated 0x800-byte kmem_cache with a deterministic double-free (ref_count starts at 2) and no read/write primitive, all unintended solutions patched. Solution: CPU-sheaf fallback + cross-cache into msg_msgseg then pipe_buffer for physical R/W, then INIT_ON_ALLOC zeroes a reclaimed cred (fsuid=0) and fchmodat2 marks /flag readable.