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CVE-2026-43371

Estado: AnalizadaMedia (5.5)—

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:

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To resolve this issue, shuffle the tx ring and tx skb array so that the first unsent packet is positioned at the start of the tx ring. Additionally, ensure that updates to `queue->tx_head` and `queue->tx_tail` are properly protected with the appropriate lock.

[1] https://docs.amd.com/v/u/en-US/ug1085-zynq-ultrascale-trm

Detalles técnicos trazas, registros y código del informe original
- 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 transmission may become stuck on a packet that has already been sent
  out, with its 'TX_USED' bit set, but has not yet been processed. However,
  due to the manipulation of 'queue->tx_head' and 'queue->tx_tail',
  `macb_tx_poll()` incorrectly assumes there are no packets to handle
  because `queue->tx_head == queue->tx_tail`. This issue is only resolved
  when a new packet is placed at this position. This is the root cause of
  the prolonged recovery time observed for the NFS root filesystem.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: macb: Shuffle the tx ring before enabling tx\n\nQuanyang observed that when using an NFS rootfs on an AMD ZynqMp board,\nthe rootfs may take an extended time to recover after a suspend.\nUpon investigation, it was determined that the issue originates from a\nproblem in the macb driver.\n\nAccording to the Zynq UltraScale TRM [1], when transmit is disabled,\nthe transmit buffer queue pointer resets to point to the address\nspecified by the transmit buffer queue base address register.\n\nIn the current implementation, the code merely resets `queue->tx_head`\nand `queue->tx_tail` to '0'. This approach presents several issues:\n\n- Packets already queued in the tx ring are silently lost,\n  leading to memory leaks since the associated skbs cannot be released.\n\n- Concurrent write access to `queue->tx_head` and `queue->tx_tail` may\n  occur from `macb_tx_poll()` or `macb_start_xmit()` when these values\n  are reset to '0'.\n\n- The transmission may become stuck on a packet that has already been sent\n  out, with its 'TX_USED' bit set, but has not yet been processed. However,\n  due to the manipulation of 'queue->tx_head' and 'queue->tx_tail',\n  `macb_tx_poll()` incorrectly assumes there are no packets to handle\n  because `queue->tx_head == queue->tx_tail`. This issue is only resolved\n  when a new packet is placed at this position. This is the root cause of\n  the prolonged recovery time observed for the NFS root filesystem.\n\nTo resolve this issue, shuffle the tx ring and tx skb array so that\nthe first unsent packet is positioned at the start of the tx ring.\nAdditionally, ensure that updates to `queue->tx_head` and\n`queue->tx_tail` are properly protected with the appropriate lock.\n\n[1] https://docs.amd.com/v/u/en-US/ug1085-zynq-ultrascale-trm"
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