high
7.8
CWE
416 362
Advisory Published
CVE Published
Updated

CVE-2023-4244: Use-after-free in Linux kernel's netfilter: nf_tables component

First published: Mon Aug 28 2023(Updated: )

A use-after-free flaw was found in nftables sub-component due to a race problem between set GC and transaction in the Linux Kernel. This flaw could allow a local attacker to crash the system, due to missing call to to `nft_set_elem_mark_busy` causing double deactivation of the element. This vulnerability could even lead to a kernel information leak problem. Refer: <a href="https://lore.kernel.org/netdev/20230810070830.24064-1-pablo@netfilter.org/">https://lore.kernel.org/netdev/20230810070830.24064-1-pablo@netfilter.org/</a> <a href="https://lore.kernel.org/netdev/20230815223011.7019-1-fw@strlen.de/">https://lore.kernel.org/netdev/20230815223011.7019-1-fw@strlen.de/</a>

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

Affected SoftwareAffected VersionHow to fix
Linux Linux kernel<6.5
redhat/Kernel<6.5
6.5
Debian Debian Linux=10.0
debian/linux
5.10.223-1
5.10.226-1
6.1.115-1
6.1.119-1
6.12.5-1

Remedy

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3e91b0ebd994635df2346353322ac51ce84ce6d8

Remedy

https://kernel.dance/3e91b0ebd994635df2346353322ac51ce84ce6d8

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

Frequently Asked Questions

  • What is CVE-2023-4244?

    CVE-2023-4244 is a use-after-free vulnerability in the Linux kernel's netfilter: nf_tables component.

  • How can CVE-2023-4244 be exploited?

    CVE-2023-4244 can be exploited to achieve local privilege escalation.

  • What is the severity of CVE-2023-4244?

    CVE-2023-4244 has a severity rating of 7.8 (high).

  • What software is affected by CVE-2023-4244?

    CVE-2023-4244 affects the Linux kernel version 6.5 and below.

  • Is there a fix for CVE-2023-4244?

    Yes, a fix for CVE-2023-4244 is available. Please refer to the provided references for more information on the fix.

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