Package: openssh-sftp-server
Version: 1:10.0p2-7+deb13u4
Severity: normal
Architecture: arm64 (Raspberry Pi 4, Debian trixie, kernel 6.18.50+rpt-rpi-v8)
The external sftp-server binary exits immediately with return code 11 and no
output, making the sftp subsystem unusable (scp/sftp fail with "Connection
closed" while interactive ssh works fine).
Steps to reproduce:
printf '3\n\n1\n\n' | /usr/lib/openssh/sftp-server; echo $? → rc=11, no output
at all.
No error is logged by sshd or the kernel. Switching to Subsystem sftp
internal-sftp in sshd_config fully works around the issue, which suggests a
problem in the external binary (possibly its seccomp sandbox on arm64).
