---
id: CVE-2026-98131
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  net: stmmac: fix dma mapping leak in stmmac_tso_xmit()

  In stmmac_tso_xmit(), if the DMA mapping of an skb fragment fails, the
  frame is dropped but the DMA mappings alr…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  net: stmmac: fix dma mapping leak in stmmac_tso_xmit()

  In stmmac_tso_xmit(), if the DMA mapping of an skb fragment fails, the
  frame is dropped but the DMA mappings alr…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= f748be531d7012c456b97f66091d86b3675c5fef <
    e85adaac3dc6317cae902372c6849189ec62cf7d
  - >-
    Linux >= f748be531d7012c456b97f66091d86b3675c5fef <
    a5d946466a95621fa2769720d59ea336003aa1a5
  - Linux 4.7
published: '2026-09-25'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T11:17:44.500'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-98131'
references:
  - url: 'https://git.kernel.org/stable/c/a5d946466a95621fa2769720d59ea336003aa1a5'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/e85adaac3dc6317cae902372c6849189ec62cf7d'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-25T11:06:38.813Z'
---

## Overview

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

net: stmmac: fix dma mapping leak in stmmac_tso_xmit()

In stmmac_tso_xmit(), if the DMA mapping of an skb fragment fails, the
frame is dropped but the DMA mappings already created for the linear
part and for the fragments mapped before the failure are never
unmapped, leaking DMA mappings.

Fix the leak by walking back over the descriptors used by the frame and
releasing each of them with stmmac_free_tx_buffer(). Moreover, release
the descriptors with stmmac_release_tx_desc() unmapping the DMA buffers.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.