medium
5.5
CWE
476
Advisory Published
CVE Published
Updated

CVE-2023-42754: Kernel: ipv4: null pointer dereference in ipv4_send_dest_unreach()

First published: Wed Sep 20 2023(Updated: )

A flaw was found in ipv4_send_dest_unreach() due to NULL pointer derefence due to a missing edge-case check.

Credit: secalert@redhat.com secalert@redhat.com secalert@redhat.com

Affected SoftwareAffected VersionHow to fix
redhat/kernel<6.6
6.6
IBM InfoSphere Guardium z/OS<=12.0
Linux kernel<6.6
Linux kernel=6.6-rc1
Linux kernel=6.6-rc2
Red Hat Enterprise Linux=8.0
Red Hat Enterprise Linux=9.0
Fedora=37
Fedora=38
Fedora=39
debian/linux
5.10.223-1
5.10.234-1
6.1.123-1
6.1.128-1
6.12.12-1
6.12.16-1

Remedy

https://access.redhat.com/security/cve/CVE-2023-42754

Remedy

https://bugzilla.redhat.com/show_bug.cgi?id=2239845

Remedy

https://seclists.org/oss-sec/2023/q4/14

Remedy

If not needed, disable the ability for unprivileged users to create namespaces. To do this temporarily, do: sudo sysctl -w kernel.unprivileged_userns_clone=0 To disable across reboots, do: echo kernel.unprivileged_userns_clone=0 | \ sudo tee /etc/sysctl.d/99-disable-unpriv-userns.conf

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is the severity of CVE-2023-42754?

    CVE-2023-42754 has been categorized as a medium severity vulnerability.

  • How do I fix CVE-2023-42754?

    To fix CVE-2023-42754, update the Linux kernel or the specific affected packages to versions that include the patch.

  • Which systems are affected by CVE-2023-42754?

    CVE-2023-42754 affects various versions of the Linux kernel up to 6.6 and specific releases of Red Hat Enterprise Linux, Fedora, and Debian.

  • What causes the vulnerability in CVE-2023-42754?

    CVE-2023-42754 is caused by a NULL pointer dereference in the ipv4_send_dest_unreach() function due to a missing edge-case check.

  • Is there a workaround for CVE-2023-42754?

    There is no documented workaround for CVE-2023-42754; upgrading to a fixed version is the recommended approach.

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