Preface: Common Use Cases for BPF
-Network Monitoring: Tools like tcpdump and Wireshark use BPF to capture and analyze network traffic.
-Security Applications: Intrusion detection systems can use BPF to filter and inspect network packets for malicious activity.
Key Features of BPF:
-Packet Filtering: BPF programs can filter network packets based on various criteria, such as IP addresses, ports, and protocols.
-Kernel Space Execution: BPF programs run in the kernel space, which allows them to process packets with minimal overhead.
-Efficiency: BPF’s design minimizes the performance impact on the system, making it suitable for high-throughput network applications.
Vulnerability details: bpf – Fix out-of-bounds write in trie_get_next_key().
Consequence: If such a write ends up in unused memory, which will never be accessed again, it will not have any consequences. In many other cases, it will just make the program crash.
Remedy: Fix out-of-bounds write in trie_get_next_key() trie_get_next_key() allocates a node stack with size trie->max_prefixlen, while it writes (trie->max_prefixlen + 1) nodes to the stack when it has full paths from the root to leaves.
Official announcement: Please refer to the vendor announcement for details –