---
id: CVE-2026-72036
title: >-
  net/sched: sch_multiq: Replace direct dequeue call with peek and
  qdisc_dequeue_peeked
summary: >-
  In the Linux kernel, the following vulnerability has been resolved:


  net/sched: sch_multiq: Replace direct dequeue call with peek and
  qdisc_dequeue_peeked


  multiq_dequeue() takes a packet from a band's child with a direct

  ->dequeue() cal…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 77be155cba4e163e8bba9fd27222a8b6189ec4f7 <
    3e5fd9d14f2d228e7260251f2e4a1d41ba8f705a
  - >-
    Linux >= 77be155cba4e163e8bba9fd27222a8b6189ec4f7 <
    eb1a9637f0bd84b5db8803af65dfb1f44785406f
  - >-
    Linux >= 77be155cba4e163e8bba9fd27222a8b6189ec4f7 <
    7a5a1582710981ef6637de9f074a60a5b1d63222
  - >-
    Linux >= 77be155cba4e163e8bba9fd27222a8b6189ec4f7 <
    86a61e46a1919e8abf4d227c204773dabb24068a
  - >-
    Linux >= 77be155cba4e163e8bba9fd27222a8b6189ec4f7 <
    1b9cc255e8089606b92b2adf504e334573682821
  - >-
    Linux >= 77be155cba4e163e8bba9fd27222a8b6189ec4f7 <
    5889064919a1e5c0a9469c54895000414fc46944
  - >-
    Linux >= 77be155cba4e163e8bba9fd27222a8b6189ec4f7 <
    fffeb2ab5eeb823d4c2330571a098f63237c9049
  - >-
    Linux >= 77be155cba4e163e8bba9fd27222a8b6189ec4f7 <
    54f6b0c843e228d499eb4b6bbb89df68cad9ad5d
  - Linux 2.6.29
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-16T15:50:31.248558Z'
published: '2026-08-15'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T15:53:17.333Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-72036'
references:
  - url: 'https://git.kernel.org/stable/c/3e5fd9d14f2d228e7260251f2e4a1d41ba8f705a'
  - url: 'https://git.kernel.org/stable/c/eb1a9637f0bd84b5db8803af65dfb1f44785406f'
  - url: 'https://git.kernel.org/stable/c/7a5a1582710981ef6637de9f074a60a5b1d63222'
  - url: 'https://git.kernel.org/stable/c/86a61e46a1919e8abf4d227c204773dabb24068a'
  - url: 'https://git.kernel.org/stable/c/1b9cc255e8089606b92b2adf504e334573682821'
  - url: 'https://git.kernel.org/stable/c/5889064919a1e5c0a9469c54895000414fc46944'
  - url: 'https://git.kernel.org/stable/c/fffeb2ab5eeb823d4c2330571a098f63237c9049'
  - url: 'https://git.kernel.org/stable/c/54f6b0c843e228d499eb4b6bbb89df68cad9ad5d'
tags:
  - cve.org
epss: 0.00169
epssPercentile: 0.05784
ingestedAt: '2026-10-16T17:24:46.873Z'
---

## Overview

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

net/sched: sch_multiq: Replace direct dequeue call with peek and qdisc_dequeue_peeked

multiq_dequeue() takes a packet from a band's child with a direct
->dequeue() call after multiq_peek() peeked it. When the child is
non-work-conserving the peek stashes the skb in the child's gso_skb, so
the direct dequeue returns a different skb and orphans the stash,
desyncing the child's qlen/backlog. With a qfq child reached through a
peeking parent (e.g. tbf) this re-enters the child on an emptied list and
dereferences NULL, panicking the kernel from softirq on ordinary egress.

Take the packet through qdisc_dequeue_peeked(), as sch_prio already does
and as sch_red and sch_sfb were just fixed to do. The helper is a no-op
when the child has no stash, so a work-conserving child is unaffected.

## Affected

- `Linux >= 77be155cba4e163e8bba9fd27222a8b6189ec4f7 < 3e5fd9d14f2d228e7260251f2e4a1d41ba8f705a`
- `Linux >= 77be155cba4e163e8bba9fd27222a8b6189ec4f7 < eb1a9637f0bd84b5db8803af65dfb1f44785406f`
- `Linux >= 77be155cba4e163e8bba9fd27222a8b6189ec4f7 < 7a5a1582710981ef6637de9f074a60a5b1d63222`
- `Linux >= 77be155cba4e163e8bba9fd27222a8b6189ec4f7 < 86a61e46a1919e8abf4d227c204773dabb24068a`
- `Linux >= 77be155cba4e163e8bba9fd27222a8b6189ec4f7 < 1b9cc255e8089606b92b2adf504e334573682821`
- `Linux >= 77be155cba4e163e8bba9fd27222a8b6189ec4f7 < 5889064919a1e5c0a9469c54895000414fc46944`
- `Linux >= 77be155cba4e163e8bba9fd27222a8b6189ec4f7 < fffeb2ab5eeb823d4c2330571a098f63237c9049`
- `Linux >= 77be155cba4e163e8bba9fd27222a8b6189ec4f7 < 54f6b0c843e228d499eb4b6bbb89df68cad9ad5d`
- `Linux 2.6.29`

## Remediation

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