high
7.8
CWE
416
Advisory Published
CVE Published
Updated

CVE-2023-3610: Use-after-free in Linux kernel's netfilter: nf_tables component

First published: Fri Jul 21 2023(Updated: )

A flaw in the Linux Kernel found. A use-after-free vulnerability in the Linux kernel's netfilter: nf_tables component can be exploited to achieve local privilege escalation. Flaw in the error handling of bound chains causes a use-after-free in the abort path of NFT_MSG_NEWRULE. The vulnerability requires CAP_NET_ADMIN to be triggered. Reference: <a href="https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=4bedf9eee016286c835e3d8fa981ddece5338795">https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=4bedf9eee016286c835e3d8fa981ddece5338795</a>

Credit: cve-coordination@google.com cve-coordination@google.com cve-coordination@google.com

Affected SoftwareAffected VersionHow to fix
redhat/kernel<0:5.14.0-284.30.1.el9_2
0:5.14.0-284.30.1.el9_2
redhat/kernel-rt<0:5.14.0-284.30.1.rt14.315.el9_2
0:5.14.0-284.30.1.rt14.315.el9_2
redhat/Kernel<6.4
6.4
Linux Kernel>=5.9<5.10.188
Linux Kernel>=5.11<5.15.119
Linux Kernel>=5.16<6.1.36
Linux Kernel>=6.2<6.3.10
Debian GNU/Linux=10.0
Debian GNU/Linux=11.0
Linux Kernel>=5.9<6.4
Linux Kernel=6.4-rc1
Linux Kernel=6.4-rc2
Linux Kernel=6.4-rc3
Linux Kernel=6.4-rc4
Linux Kernel=6.4-rc5
Linux Kernel=6.4-rc6
Linux Kernel=6.4-rc7
debian/linux
5.10.223-1
5.10.226-1
6.1.123-1
6.1.128-1
6.12.12-1
6.12.13-1
Debian=10.0
Debian=11.0

Remedy

In order to trigger the issue, it requires the ability to create user/net namespaces. On non-containerized deployments of Red Hat Enterprise Linux 8, you can disable 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 On containerized deployments, such as Red Hat OpenShift Container Platform, do not use this mitigation as the functionality is needed to be enabled.

Remedy

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=4bedf9eee016286c835e3d8fa981ddece5338795

Remedy

https://kernel.dance/4bedf9eee016286c835e3d8fa981ddece5338795

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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Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is the severity of CVE-2023-3610?

    CVE-2023-3610 is classified as a high severity vulnerability due to its potential for local privilege escalation.

  • How do I fix CVE-2023-3610?

    To fix CVE-2023-3610, upgrade to the kernel version 0:5.14.0-284.30.1.el9_2 or related patched versions available from your distribution's repository.

  • Which systems are affected by CVE-2023-3610?

    CVE-2023-3610 affects various versions of the Linux kernel, particularly those between 5.9 and 6.4, including specific versions in Debian and Red Hat distributions.

  • What type of vulnerability is CVE-2023-3610?

    CVE-2023-3610 is a use-after-free vulnerability located in the netfilter: nf_tables component of the Linux kernel.

  • Can CVE-2023-3610 be exploited remotely?

    No, CVE-2023-3610 requires local access to the system, as it is a local privilege escalation vulnerability.

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