CVE-2026-63821

CVE CVE-2026-63821EUVD EUVD-2026-45487Published 2026-07-19T12:02:18.000Z

What the advisory describes

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

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux a82dfd33d1237f6c0fb8a7077022189d1fc7ec98 <6b964941bbfe6e0f18b1a5e008486dbb62df440a; a82dfd33d1237f6c0fb8a7077022189d1fc7ec98 <53fed4061a09755de99c89fdc7fae5b794da455f; patch: 6.18.38; patch: 7.1.3; patch: 6.12.95; patch: 6.6.144; a82dfd33d1237f6c0fb8a7077022189d1fc7ec98 <200d58c851b8f63f77a05570072dd20f79bc3681; patch: 0; a82dfd33d1237f6c0fb8a7077022189d1fc7ec98 <8206d173d18ef5a077423119f4e9a93cb3a6f4eb; patch: 7.2-rc1; a82dfd33d1237f6c0fb8a7077022189d1fc7ec98 <2b2060c2075a72bc2de43ce5e1b9347d6c5e27bb; 6.2

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

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Linux — Linux

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