medium
5.5
CWE
476
Advisory Published
CVE Published
Updated

CVE-2022-47929: Null Pointer Dereference

First published: Mon Jan 09 2023(Updated: )

A NULL pointer dereference flaw may occur in qdisc_graft in net/sched/sch_api.c in the Linux kernel. In this flaw a local unprivileged user mas trigger a denial of service if the alloc_workqueue function return is not validated in time of failure. This flaw could allow an attacker to crash the system or leak internal kernel information. Reference: <a href="https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=96398560f26aa07e8f2969d73c8197e6a6d10407">https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=96398560f26aa07e8f2969d73c8197e6a6d10407</a>

Credit: cve@mitre.org cve@mitre.org

Affected SoftwareAffected VersionHow to fix
redhat/kernel-rt<0:4.18.0-477.10.1.rt7.274.el8_8
0:4.18.0-477.10.1.rt7.274.el8_8
redhat/kernel<0:4.18.0-477.10.1.el8_8
0:4.18.0-477.10.1.el8_8
redhat/kernel<0:5.14.0-284.11.1.el9_2
0:5.14.0-284.11.1.el9_2
redhat/kernel-rt<0:5.14.0-284.11.1.rt14.296.el9_2
0:5.14.0-284.11.1.rt14.296.el9_2
redhat/kernel<6.2
6.2
Linux Kernel<6.1.6
Debian Debian Linux=11.0
debian/linux
5.10.223-1
5.10.226-1
6.1.123-1
6.1.119-1
6.12.10-1
6.12.11-1

Remedy

The mitigation is to disable unprivileged user namespaces by setting user.max_user_namespaces to 0: ``` # echo "user.max_user_namespaces=0" > /etc/sysctl.d/userns.conf # sysctl -p /etc/sysctl.d/userns.conf ```

Remedy

https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.1.6

Remedy

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=96398560f26aa07e8f2969d73c8197e6a6d10407

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is the severity of CVE-2022-47929?

    CVE-2022-47929 has a high severity rating due to its potential to cause a denial of service.

  • How do I fix CVE-2022-47929?

    To fix CVE-2022-47929, update to the latest kernel version as specified in the remediation details for your operating system.

  • Who is affected by CVE-2022-47929?

    CVE-2022-47929 affects users of vulnerable versions of the Linux kernel, particularly those using the Red Hat and Debian distributions.

  • What type of vulnerability is CVE-2022-47929?

    CVE-2022-47929 is a NULL pointer dereference vulnerability that can lead to a system crash.

  • Is there an exploit available for CVE-2022-47929?

    While there is no public knowledge of an exploit specifically targeting CVE-2022-47929, the vulnerability does pose significant risk if left unpatched.

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