---
id: CVE-2024-49977
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  net: stmmac: Fix zero-division error when disabling tc cbs

  The commit b8c43360f6e4 ("net: stmmac: No need to calculate speed divider
  when offload is disabled") allows …
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  net: stmmac: Fix zero-division error when disabling tc cbs

  The commit b8c43360f6e4 ("net: stmmac: No need to calculate speed divider
  when offload is disabled") allows …
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'
cwe:
  - CWE-369
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 5.10.221, < 5.10.227'
  - 'linux_kernel >= 5.15.162, < 5.15.168'
  - 'linux_kernel >= 6.1.96, < 6.1.113'
  - 'linux_kernel >= 6.6.36, < 6.6.55'
  - 'linux_kernel >= 6.9.7, < 6.10'
  - 'linux_kernel >= 6.10, < 6.10.14'
  - 'linux_kernel >= 6.11, < 6.11.3'
patched:
  - linux_kernel 6.11.3
published: '2024-10-21'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T01:19:03.000'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2024-49977'
references:
  - url: 'https://git.kernel.org/stable/c/03582f4752427f60817d896f1a827aff772bd31e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/5d43e1ad4567d67af2b42d3ab7c14152ffed25c6'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/675faf5a14c14a2be0b870db30a70764df81e2df'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/837d9df9c0792902710149d1a5e0991520af0f93'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/b0da9504a528f05f97d926b4db74ff21917a33e9'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/e297a2bf56d12fd7f91a0c209eb6ea84361f3368'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/e33fe25b1efe4f2e6a5858786dbc82ae4c44ed4c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-265688.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-355557.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
  - cve.org
epss: 0.00248
epssPercentile: 0.14956
ingestedAt: '2026-10-15T03:30:12.756Z'
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2024-10-22T13:33:01.213521Z'
---

## Overview

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

net: stmmac: Fix zero-division error when disabling tc cbs

The commit b8c43360f6e4 ("net: stmmac: No need to calculate speed divider
when offload is disabled") allows the "port_transmit_rate_kbps" to be
set to a value of 0, which is then passed to the "div_s64" function when
tc-cbs is disabled. This leads to a zero-division error.

When tc-cbs is disabled, the idleslope, sendslope, and credit values the
credit values are not required to be configured. Therefore, adding a return
statement after setting the txQ mode to DCB when tc-cbs is disabled would
prevent a zero-division error.

## Affected

- `linux_kernel >= 5.10.221, < 5.10.227`
- `linux_kernel >= 5.15.162, < 5.15.168`
- `linux_kernel >= 6.1.96, < 6.1.113`
- `linux_kernel >= 6.6.36, < 6.6.55`
- `linux_kernel >= 6.9.7, < 6.10`
- `linux_kernel >= 6.10, < 6.10.14`
- `linux_kernel >= 6.11, < 6.11.3`

## Remediation

Upgrade past the affected range:

- `linux_kernel 6.11.3`