medium
6
CWE
125
Advisory Published
CVE Published
CVE Published
Updated

CVE-2023-39189: Kernel: netfilter: nftables out-of-bounds read in nf_osf_match_one()

First published: Wed Jul 26 2023(Updated: )

A flaw was found in the Netfilter subsystem in the Linux kernel. The nfnl_osf_add_callback function did not validate the user mode controlled opt_num field. This flaw allows a local privileged (CAP_NET_ADMIN) attacker to trigger an out-of-bounds read, leading to a crash or information disclosure.

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

Affected SoftwareAffected VersionHow to fix
Linux Linux kernel<6.6
Redhat Enterprise Linux=8.0
Redhat Enterprise Linux=9.0
Fedoraproject Fedora=38
redhat/kernel<6.6
6.6
debian/linux
5.10.223-1
5.10.226-1
6.1.115-1
6.1.112-1
6.11.7-1
6.11.9-1

Remedy

https://bugzilla.redhat.com/show_bug.cgi?id=2226777

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

Remedy

https://git.kernel.org/linus/11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384

Remedy

https://git.kernel.org/linus/f4f8a7803119005e87b716874bec07c751efafec

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Reference Links

Frequently Asked Questions

  • What is CVE-2023-39189?

    CVE-2023-39189 is a vulnerability found in the Netfilter subsystem in the Linux kernel that allows a local privileged attacker to trigger an out-of-bounds read, leading to a crash or information disclosure.

  • How severe is CVE-2023-39189?

    CVE-2023-39189 has a severity rating of medium with a value of 6.

  • Which software is affected by CVE-2023-39189?

    The Linux kernel versions up to 6.6, Redhat Enterprise Linux versions 8.0 and 9.0, and Fedora version 38 are affected by CVE-2023-39189.

  • How can I fix CVE-2023-39189?

    To fix CVE-2023-39189, it is recommended to update the affected software to a version that includes the patch for this vulnerability.

  • Where can I find more information about CVE-2023-39189?

    You can find more information about CVE-2023-39189 on the Redhat Security Advisory page and the Bugzilla entry.

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