CVE-2026-63821

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> wifi: rtw88: usb: fix memory leaks on USB write failures<br /> <br /> When rtw_usb_write_port() fails to submit a USB Request Block (URB)<br /> (e.g., due to device disconnect or ENOMEM), the completion callback is<br /> never executed.<br /> <br /> Currently, the driver ignores the return value of rtw_usb_write_port()<br /> in rtw_usb_write_data() and rtw_usb_tx_agg_skb(). Because these<br /> functions rely on the completion callback to free the socket buffers<br /> (skbs) and the transaction control block (txcb), a submission failure<br /> results in:<br /> 1. A memory leak of the allocated skb in rtw_usb_write_data().<br /> 2. A memory leak of the txcb structure and all aggregated skbs in<br /> rtw_usb_tx_agg_skb().<br /> <br /> Fix this by checking the return value of rtw_usb_write_port(). If it<br /> fails, explicitly free the skb in rtw_usb_write_data(), and properly<br /> purge the tx_ack_queue and free the txcb in rtw_usb_tx_agg_skb().<br /> <br /> The issue was discovered in practice during device disconnect/reconnect<br /> scenarios and memory pressure conditions. Tested by verifying normal TX<br /> operation continues after the fix without regressions.