RDMA Read Response Buffer Overflow in Linux Kernel

CVE-2026-64268 is a critical buffer overflow vulnerability in the Linux kernel's RDMA over InfiniBand software implementation (siw driver). The vulnerability exists in the siw_proc_rresp() function, which processes inbound Read Response DDP segments without properly validating that accumulated data stays within sink buffer boundaries on continuation segments. This affects systems using RDMA/InfiniBand for high-performance networking, including HPC clusters, data centers, and cloud infrastructure relying on kernel-level RDMA drivers. An attacker with network access to RDMA-enabled systems could trigger memory corruption, potentially leading to privilege escalation, denial of service, or arbitrary code execution within kernel space.

Casky's AI-driven analysis with extended reasoning identifies the attack mechanics underlying this vulnerability by mapping defensive detection patterns to memory safety violations and network protocol anomalies. While the CVE currently maps to zero MITRE ATT&CK techniques and has no assigned CWE, practitioners using Casky would detect exploitation attempts through skills focused on: (1) abnormal kernel memory access patterns and buffer boundary violations, (2) RDMA/InfiniBand protocol-level anomalies showing malformed continuation segments, (3) process crashes or unexpected kernel panics in RDMA drivers following specific network traffic sequences, and (4) privilege escalation attempts originating from RDMA client processes. The platform's threat intelligence would flag suspicious DDP fragmentation patterns and accumulation logic bypasses that classic signature-based detection might miss.