Description
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.
Affected products
linux: linux kernel
References5
- git.kernel.org/stable/c/200d58c851b8f63f77a05570072dd20f79bc3681 Patch
- git.kernel.org/stable/c/2b2060c2075a72bc2de43ce5e1b9347d6c5e27bb Patch
- git.kernel.org/stable/c/53fed4061a09755de99c89fdc7fae5b794da455f Patch
- git.kernel.org/stable/c/6b964941bbfe6e0f18b1a5e008486dbb62df440a Patch
- git.kernel.org/stable/c/8206d173d18ef5a077423119f4e9a93cb3a6f4eb Patch
Metrics
- CVSS 3.1
-
5.5
MEDIUM
Score source: NVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - EPSS — exploit probability
- 0% percentile: 2 · as of 14 November 2026
- CWE
- CWE-401
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