---
id: CVE-2022-47929
title: >-
  In the Linux kernel before 6.1.6, a NULL pointer dereference bug in the
  traffic control subsystem allows an unprivileged user to trigger a denial of
  service (system crash) via a crafted traffic control configuration that is set
  up with "…
summary: >-
  In the Linux kernel before 6.1.6, a NULL pointer dereference bug in the
  traffic control subsystem allows an unprivileged user to trigger a denial of
  service (system crash) via a crafted traffic control configuration that is set
  up with "…
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-476
  - CWE-476
vendor: linux
product: linux_kernel
affected:
  - linux_kernel < 6.1.6
  - debian_linux = 11.0
patched:
  - linux_kernel 6.1.6
published: '2023-01-17'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T19:16:55.770'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2022-47929'
references:
  - url: 'https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.1.6'
    label: cve@mitre.org
  - url: >-
      https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=96398560f26aa07e8f2969d73c8197e6a6d10407
    label: cve@mitre.org
  - url: 'https://lists.debian.org/debian-lts-announce/2023/03/msg00000.html'
    label: cve@mitre.org
  - url: 'https://lists.debian.org/debian-lts-announce/2023/05/msg00006.html'
    label: cve@mitre.org
  - url: 'https://tldp.org/HOWTO/Traffic-Control-HOWTO/components.html'
    label: cve@mitre.org
  - url: 'https://www.debian.org/security/2023/dsa-5324'
    label: cve@mitre.org
  - url: 'https://www.spinics.net/lists/netdev/msg555705.html'
    label: cve@mitre.org
  - url: 'https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.1.6'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=96398560f26aa07e8f2969d73c8197e6a6d10407
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2023/03/msg00000.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2023/05/msg00006.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://tldp.org/HOWTO/Traffic-Control-HOWTO/components.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://www.debian.org/security/2023/dsa-5324'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://www.spinics.net/lists/netdev/msg555705.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-769027.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-794697.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
epss: 0.00964
epssPercentile: 0.60867
ingestedAt: '2026-10-14T19:49:57.529Z'
---

## Overview

In the Linux kernel before 6.1.6, a NULL pointer dereference bug in the traffic control subsystem allows an unprivileged user to trigger a denial of service (system crash) via a crafted traffic control configuration that is set up with "tc qdisc" and "tc class" commands. This affects qdisc_graft in net/sched/sch_api.c.

## Affected

- `linux_kernel < 6.1.6`
- `debian_linux = 11.0`

## Remediation

Upgrade past the affected range:

- `linux_kernel 6.1.6`