Pidfd_getfd

ssh-keysign-pwn: pidfd_getfd FD Theft via mm-NULL Exit Window (CVE-2026-46333)

ssh-keysign-pwn demonstrates a local file-descriptor theft primitive on vulnerable Linux kernels. During process exit, a race window appears after exitmm() but before file descriptors are closed; in that state pidfdgetfd(2) can bypass expected dumpable checks…