CVE-2026-31660

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> nfc: pn533: allocate rx skb before consuming bytes<br /> <br /> pn532_receive_buf() reports the number of accepted bytes to the serdev<br /> core. The current code consumes bytes into recv_skb and may already hand<br /> a complete frame to pn533_recv_frame() before allocating a fresh receive<br /> buffer.<br /> <br /> If that alloc_skb() fails, the callback returns 0 even though it has<br /> already consumed bytes, and it leaves recv_skb as NULL for the next<br /> receive callback. That breaks the receive_buf() accounting contract and<br /> can also lead to a NULL dereference on the next skb_put_u8().<br /> <br /> Allocate the receive skb lazily before consuming the next byte instead.<br /> If allocation fails, return the number of bytes already accepted.