CVE-2026-43371

Technical Description

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

net: macb: Shuffle the tx ring before enabling tx

Quanyang observed that when using an NFS rootfs on an AMD ZynqMp board,

the rootfs may take an extended time to recover after a suspend.

Upon investigation, it was determined that the issue originates from a

problem in the macb driver.

According to the Zynq UltraScale TRM [1], when transmit is disabled,

the transmit buffer queue pointer resets to point to the address

specified by the transmit buffer queue base address register.

In the current implementation, the code merely resets `queue->tx_head`

and `queue->tx_tail` to '0'. This approach presents several issues:

- Packets already queued in the tx ring are silently lost,

leading to memory leaks since the associated skbs cannot be released.

- Concurrent write access to `queue->tx_head` and `queue->tx_tail` may

occur from `macb_tx_poll()` or `macb_start_xmit()` when these values

are reset to '0'.

- The trans

Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected Products

References