---
id: CVE-2025-37992
title: 'net_sched: Flush gso_skb list too during ->change()'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  net_sched: Flush gso_skb list too during ->change()

  Previously, when reducing a qdisc's limit via the ->change() operation, only
  the main skb queue was trimmed, potent…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 76e3cc126bb223013a6b9a0e2a51238d1ef2e409 <
    ea1132ccb112f51ba749c56a912f67970c2cd542
  - >-
    Linux >= 76e3cc126bb223013a6b9a0e2a51238d1ef2e409 <
    d3336f746f196c6a53e0480923ae93939f047b6c
  - >-
    Linux >= 76e3cc126bb223013a6b9a0e2a51238d1ef2e409 <
    d38939ebe0d992d581acb6885c1723fa83c1fb2c
  - >-
    Linux >= 76e3cc126bb223013a6b9a0e2a51238d1ef2e409 <
    a7d6e0ac0a8861f6b1027488062251a8e28150fd
  - >-
    Linux >= 76e3cc126bb223013a6b9a0e2a51238d1ef2e409 <
    d1365ca80b012d8a7863e45949e413fb61fa4861
  - >-
    Linux >= 76e3cc126bb223013a6b9a0e2a51238d1ef2e409 <
    fe88c7e4fc2c1cd75a278a15ffbf1689efad4e76
  - >-
    Linux >= 76e3cc126bb223013a6b9a0e2a51238d1ef2e409 <
    2d3cbfd6d54a2c39ce3244f33f85c595844bd7b8
  - Linux 3.5
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-05T20:47:38.583699Z'
published: '2025-05-26'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T20:52:11.344Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2025-37992'
references:
  - url: 'https://git.kernel.org/stable/c/ea1132ccb112f51ba749c56a912f67970c2cd542'
  - url: 'https://git.kernel.org/stable/c/d3336f746f196c6a53e0480923ae93939f047b6c'
  - url: 'https://git.kernel.org/stable/c/d38939ebe0d992d581acb6885c1723fa83c1fb2c'
  - url: 'https://git.kernel.org/stable/c/a7d6e0ac0a8861f6b1027488062251a8e28150fd'
  - url: 'https://git.kernel.org/stable/c/d1365ca80b012d8a7863e45949e413fb61fa4861'
  - url: 'https://git.kernel.org/stable/c/fe88c7e4fc2c1cd75a278a15ffbf1689efad4e76'
  - url: 'https://git.kernel.org/stable/c/2d3cbfd6d54a2c39ce3244f33f85c595844bd7b8'
tags:
  - cve.org
epss: 0.00216
epssPercentile: 0.12029
ingestedAt: '2026-11-05T22:38:31.918Z'
---

## Overview

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

net_sched: Flush gso_skb list too during ->change()

Previously, when reducing a qdisc's limit via the ->change() operation, only
the main skb queue was trimmed, potentially leaving packets in the gso_skb
list. This could result in NULL pointer dereference when we only check
sch->limit against sch->q.qlen.

This patch introduces a new helper, qdisc_dequeue_internal(), which ensures
both the gso_skb list and the main queue are properly flushed when trimming
excess packets. All relevant qdiscs (codel, fq, fq_codel, fq_pie, hhf, pie)
are updated to use this helper in their ->change() routines.

## Affected

- `Linux >= 76e3cc126bb223013a6b9a0e2a51238d1ef2e409 < ea1132ccb112f51ba749c56a912f67970c2cd542`
- `Linux >= 76e3cc126bb223013a6b9a0e2a51238d1ef2e409 < d3336f746f196c6a53e0480923ae93939f047b6c`
- `Linux >= 76e3cc126bb223013a6b9a0e2a51238d1ef2e409 < d38939ebe0d992d581acb6885c1723fa83c1fb2c`
- `Linux >= 76e3cc126bb223013a6b9a0e2a51238d1ef2e409 < a7d6e0ac0a8861f6b1027488062251a8e28150fd`
- `Linux >= 76e3cc126bb223013a6b9a0e2a51238d1ef2e409 < d1365ca80b012d8a7863e45949e413fb61fa4861`
- `Linux >= 76e3cc126bb223013a6b9a0e2a51238d1ef2e409 < fe88c7e4fc2c1cd75a278a15ffbf1689efad4e76`
- `Linux >= 76e3cc126bb223013a6b9a0e2a51238d1ef2e409 < 2d3cbfd6d54a2c39ce3244f33f85c595844bd7b8`
- `Linux 3.5`

## Remediation

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