CVE-2026-43255 PUBLISHED

In the Linux kernel, the following vulnerability has been resolved:

wifi: libertas: fix WARNING in usb_tx_block

The function usb_tx_block() submits cardp->tx_urb without ensuring that any previous transmission on this URB has completed. If a second call occurs while the URB is still active (e.g. during rapid firmware loading), usb_submit_urb() detects the active state and triggers a warning: 'URB submitted while active'.

Fix this by enforcing serialization: call usb_kill_urb() before submitting the new request. This ensures the URB is idle and safe to reuse.

• https://git.kernel.org/stable/c/498525d8358d6d20918787e59736d5b6a021e9fd
• https://git.kernel.org/stable/c/2902a9b4415a6bafc9b1e5dd360f065d757a0bb7
• https://git.kernel.org/stable/c/948a39c95d0f8d73722910f8cdb7b6e3e9206232
• https://git.kernel.org/stable/c/5bfb25495e391a1be0db94b15715174fa06b93a1
• https://git.kernel.org/stable/c/b82073564373e68c6ae3a96039fae14cd002a496
• https://git.kernel.org/stable/c/3308c7504e093b22e91a4468470309cee2e26b83
• https://git.kernel.org/stable/c/fc188b44547dea4e7350833171982a6312befde9
• https://git.kernel.org/stable/c/d66676e6ca96bf8680f869a9bd6573b26c634622