CVE-2026-53216

Description

In the Linux kernel, the following vulnerability has been resolved: net: mvpp2: limit XDP frame size to the RX buffer mvpp2 has short and long BM pools, and short pool buffers can be smaller than PAGE_SIZE. The XDP path nevertheless initializes every xdp_buff with PAGE_SIZE as frame size. XDP helpers use frame_sz to validate tail growth and to derive the hard end of the data area. Advertising PAGE_SIZE for short buffers can let bpf_xdp_adjust_tail() grow a packet past the real allocation, corrupting memory or later tripping skb tailroom checks. Initialize the XDP buffer with bm_pool->frag_size so XDP tailroom matches the actual buffer backing the packet.

References

• https://git.kernel.org/stable/c/3b8b0c3631b19faee53f0d15a49924129b063eec
• https://git.kernel.org/stable/c/910617a4e67dbdd5fdb39d9dc6a51e491e1b2c3e
• https://git.kernel.org/stable/c/9545cc5ef18ca22d031f2f47c157192460652359
• https://git.kernel.org/stable/c/994bd2b58d2bd08aa97ec0836cc813cfcb00d749
• https://git.kernel.org/stable/c/a3ee9231ccec6ec3be2de89c56f897055fd9eab1