CVE-2026-63821: Linux

Описание

Оригинално описание

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.

Засегнати продукти

• Linux Linux: a82dfd33d1237f6c0fb8a7077022189d1fc7ec98 преди 2b2060c2075a72bc2de43ce5e1b9347d6c5e27bb; a82dfd33d1237f6c0fb8a7077022189d1fc7ec98 преди 53fed4061a09755de99c89fdc7fae5b794da455f; a82dfd33d1237f6c0fb8a7077022189d1fc7ec98 преди 200d58c851b8f63f77a05570072dd20f79bc3681; a82dfd33d1237f6c0fb8a7077022189d1fc7ec98 преди 8206d173d18ef5a077423119f4e9a93cb3a6f4eb; a82dfd33d1237f6c0fb8a7077022189d1fc7ec98 преди 6b964941bbfe6e0f18b1a5e008486dbb62df440a
• Linux Linux: 6.2; преди 6.2; 6.6.144 до 6.6.*; 6.12.95 до 6.12.*; 6.18.38 до 6.18.*; 7.1.3 до 7.1.*; 7.2 до *

История

Други уязвимости в Linux Linux

• 8.1CVE-2026-99270
• 7.8CVE-2026-99269
• CVE-2026-99268
• CVE-2026-99266
• CVE-2026-99267

Първоизточници

• https://www.cve.org/CVERecord?id=CVE-2026-63821
• https://nvd.nist.gov/vuln/detail/CVE-2026-63821
• https://git.kernel.org/stable/c/2b2060c2075a72bc2de43ce5e1b9347d6c5e27bb
• https://git.kernel.org/stable/c/53fed4061a09755de99c89fdc7fae5b794da455f
• https://git.kernel.org/stable/c/200d58c851b8f63f77a05570072dd20f79bc3681
• https://git.kernel.org/stable/c/8206d173d18ef5a077423119f4e9a93cb3a6f4eb
• https://git.kernel.org/stable/c/6b964941bbfe6e0f18b1a5e008486dbb62df440a