medium
6.1
CWE
401 416
EPSS
0.042%
Advisory Published
CVE Published
Updated

CVE-2023-7192: Kernel: refcount leak in ctnetlink_create_conntrack()

First published: Sat Dec 30 2023(Updated: )

A memory leak problem was found in ctnetlink_create_conntrack in net/netfilter/nf_conntrack_netlink.c in the Linux Kernel. In this flaw a local attacker with CAP_NET_ADMIN privilege may cause a denial of service (DoS) attack due to a refcount overflows. Refer: <a href="https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=ac4893980bbe79ce383daf9a0885666a30fe4c83">https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=ac4893980bbe79ce383daf9a0885666a30fe4c83</a>

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

Affected SoftwareAffected VersionHow to fix
redhat/Kernel<6.3
6.3
Linux kernel<6.3
Red Hat Enterprise Linux=8.0
Red Hat Enterprise Linux=9.0
IBM Security QRadar<=7.5 - 7.5.0 UP8 IF01
debian/linux
5.10.223-1
5.10.234-1
6.1.129-1
6.1.133-1
6.12.21-1
6.12.22-1

Remedy

https://bugzilla.redhat.com/show_bug.cgi?id=2256279

Remedy

https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=ac4893980bbe79ce383daf9a0885666a30fe4c83

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-2023-7192?

    CVE-2023-7192 is categorized as a high severity vulnerability due to its potential to cause denial of service attacks.

  • How do I fix CVE-2023-7192?

    To address CVE-2023-7192, update your Linux Kernel to version 6.3 or later, or apply the relevant patches provided by your operating system vendor.

  • Which versions are affected by CVE-2023-7192?

    CVE-2023-7192 affects various versions of the Linux Kernel prior to 6.3, as well as specific versions of the Red Hat Enterprise Linux and IBM QRadar SIEM products.

  • What does CVE-2023-7192 exploit?

    CVE-2023-7192 exploits a memory leak in the ctnetlink_create_conntrack function within the Linux Kernel, leading to potential denial of service.

  • Who can be impacted by CVE-2023-7192?

    Local attackers with CAP_NET_ADMIN privileges can exploit CVE-2023-7192 to launch denial of service attacks on the affected systems.

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