CyberRota Analysis
AI-GeneratedThe vulnerability affects the Linux kernel's packet handling, specifically in the tpacket_snd() function, where inconsistent handling of the `hard_header_len` can lead to improper allocation of socket buffer headroom during packet transmission. This inconsistency may result in negative copy lengths or insufficient headroom, potentially causing memory corruption or denial of service. Organizations using Linux-based systems, particularly those relying on network packet processing, should prioritize addressing this vulnerability to ensure system stability and security.
Original NVD Description
In the Linux kernel, the following vulnerability has been resolved: packet: use consistent hard_header_len in TX_RING send path tpacket_snd() reads dev->hard_header_len independently for skb allocation and header construction in tpacket_fill_skb(). Concurrent netdevice reconfiguration can therefore make the reserved headroom smaller than the amount later pushed, or make copylen - hard_header_len negative. Snapshot hard_header_len once before processing ring frames and use it for the frame limit, headroom allocation, copy length, and skb construction. Pass the snapshot to tpacket_fill_skb(). The separate SOCK_DGRAM consistency problem between hard_header_len and header_ops->create is not addressed here.