---
id: CVE-2024-56719
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  net: stmmac: fix TSO DMA API usage causing oops

  Commit 66600fac7a98 ("net: stmmac: TSO: Fix unbalanced DMA map/unmap
  for non-paged SKB data") moved the assignment of t…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  net: stmmac: fix TSO DMA API usage causing oops

  Commit 66600fac7a98 ("net: stmmac: TSO: Fix unbalanced DMA map/unmap
  for non-paged SKB data") moved the assignment of t…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 5.15.171, < 5.16'
  - 'linux_kernel >= 6.1.116, < 6.2'
  - 'linux_kernel >= 6.6.60, < 6.6.68'
  - 'linux_kernel >= 6.11.7, < 6.12.7'
  - linux_kernel = 6.13
patched:
  - linux_kernel 6.12.7
published: '2024-12-29'
updated: '2026-07-14'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2024-56719'
references:
  - url: 'https://git.kernel.org/stable/c/05968b6dd0ffc65d7386608b11a11fb4fdfc9f36'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/4c49f38e20a57f8abaebdf95b369295b153d1f8e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/6abcdc9a73274052a9e96a1926994ecf9aedad82'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/9d5dd7ccea1b46a9a7c6b3c2b9e5ed8864e185e2'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/db3667c9bbfbbf5de98e6c9542f7e03fb5243286'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-019113.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-082556.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
  - cve.org
epss: 0.00496
epssPercentile: 0.39992
ingestedAt: '2026-07-14T13:36:54.789Z'
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2025-10-01T19:58:24.752519Z'
---

## Overview

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

net: stmmac: fix TSO DMA API usage causing oops

Commit 66600fac7a98 ("net: stmmac: TSO: Fix unbalanced DMA map/unmap
for non-paged SKB data") moved the assignment of tx_skbuff_dma[]'s
members to be later in stmmac_tso_xmit().

The buf (dma cookie) and len stored in this structure are passed to
dma_unmap_single() by stmmac_tx_clean(). The DMA API requires that
the dma cookie passed to dma_unmap_single() is the same as the value
returned from dma_map_single(). However, by moving the assignment
later, this is not the case when priv->dma_cap.addr64 > 32 as "des"
is offset by proto_hdr_len.

This causes problems such as:

  dwc-eth-dwmac 2490000.ethernet eth0: Tx DMA map failed

and with DMA_API_DEBUG enabled:

  DMA-API: dwc-eth-dwmac 2490000.ethernet: device driver tries to +free DMA memory it has not allocated [device address=0x000000ffffcf65c0] [size=66 bytes]

Fix this by maintaining "des" as the original DMA cookie, and use
tso_des to pass the offset DMA cookie to stmmac_tso_allocator().

Full details of the crashes can be found at:
https://lore.kernel.org/all/d8112193-0386-4e14-b516-37c2d838171a@nvidia.com/
https://lore.kernel.org/all/klkzp5yn5kq5efgtrow6wbvnc46bcqfxs65nz3qy77ujr5turc@bwwhelz2l4dw/

## Affected

- `linux_kernel >= 5.15.171, < 5.16`
- `linux_kernel >= 6.1.116, < 6.2`
- `linux_kernel >= 6.6.60, < 6.6.68`
- `linux_kernel >= 6.11.7, < 6.12.7`
- `linux_kernel = 6.13`

## Remediation

Upgrade past the affected range:

- `linux_kernel 6.12.7`