CVE-2026-4747

A stack buffer overflow exists in the FreeBSD kernel's RPCSEC_GSS implementation within the kgssapi.ko module. Specifically, the svc_rpc_gss_validate() function fails to perform adequate bounds checking when copying on-wire credential bodies into a fixed 128-byte stack array (rpchdr). Because xdr...

FreeBSD -- Remote code execution via RPCSEC_GSS packet validation

Problem Description: Each RPCSECGSS data packet is validated by a routine which checks a signature in the packet. This routine copies a portion of the packet into a stack buffer, but fails to ensure that the buffer is sufficiently large, and a malicious client can trigger a stack overflow. Notabl...