CVE-2026-23080can: mcba_usb: mcba_usb_read_bulk_callback(): fix URB memory leak

Official description

In the Linux kernel, the following vulnerability has been resolved: can: mcba_usb: mcba_usb_read_bulk_callback(): fix URB memory leak Fix similar memory leak as in commit 7352e1d5932a ("can: gs_usb: gs_usb_receive_bulk_callback(): fix URB memory leak"). In mcba_usb_probe() -> mcba_usb_start(), the URBs for USB-in transfers are allocated, added to the priv->rx_submitted anchor and submitted. In the complete callback mcba_usb_read_bulk_callback(), the URBs are processed and resubmitted. In mcba_usb_close() -> mcba_urb_unlink() the URBs are freed by calling usb_kill_anchored_urbs(&priv->rx_submitted). However, this does not take into account that the USB framework unanchors the URB before the complete function is called. This means that once an in-URB has been completed, it is no longer anchored and is ultimately not released in usb_kill_anchored_urbs(). Fix the memory leak by anchoring the URB in the mcba_usb_read_bulk_callback()to the priv->rx_submitted anchor.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/8b34c611a4feb81921bc4728c091e4e3ba0270c0
• https://git.kernel.org/stable/c/b5a1ccdc63b71d93a69a6b72f7a3f3934293ea60
• https://git.kernel.org/stable/c/59153b6388e05609144ad56a9b354e9100a91983
• https://git.kernel.org/stable/c/179f6f0cf5ae489743273b7c1644324c0c477ea9
• https://git.kernel.org/stable/c/94c9f6f7b953f6382fef4bdc48c046b861b8868f
• https://git.kernel.org/stable/c/d374d715e338dfc3804aaa006fa6e470ffebb264
• https://git.kernel.org/stable/c/710a7529fb13c5a470258ff5508ed3c498d54729