high
7.8
CWE
416
Advisory Published
CVE Published
Updated

CVE-2023-4004: Kernel: netfilter: use-after-free due to improper element removal in nft_pipapo_remove()

First published: Mon Jul 24 2023(Updated: )

A flaw in the Linux Kernel found. Improper element removal in function nft_pipapo_remove when insert an element without a NFT_SET_EXT_KEY_END that can lead to use-after-free. Reference: <a href="https://patchwork.ozlabs.org/project/netfilter-devel/patch/20230719190824.21196-1-fw@strlen.de/">https://patchwork.ozlabs.org/project/netfilter-devel/patch/20230719190824.21196-1-fw@strlen.de/</a>

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

Affected SoftwareAffected VersionHow to fix
redhat/kernel<6.5
6.5
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
Linux Kernel>=5.6<5.10.188
Linux Kernel>=5.11<5.15.123
Linux Kernel>=5.16<6.1.42
Linux Kernel>=6.2<6.4.7
Fedora=38
Red Hat Enterprise Linux=8.0
Red Hat Enterprise Linux=9.0
netapp h300s
netapp h410s
netapp h500s
netapp h700s
Debian=10.0
Debian=11.0
Debian=12.0
Linux Kernel<6.5
Linux Kernel=6.5-rc1
Linux Kernel=6.5-rc2
Linux Kernel=6.5-rc3
Linux Kernel=6.5-rc4
IBM Storage Protect Plus<=10.1

Remedy

https://patchwork.ozlabs.org/project/netfilter-devel/patch/20230719190824.21196-1-fw@strlen.de/

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-2023-4004?

    CVE-2023-4004 has a high severity rating due to its potential to cause use-after-free vulnerabilities in the Linux Kernel.

  • How do I fix CVE-2023-4004?

    To fix CVE-2023-4004, update the Linux Kernel to a version that includes the patch addressing this vulnerability.

  • Which systems are affected by CVE-2023-4004?

    CVE-2023-4004 affects various systems including IBM Storage Protect Plus vSnap, Red Hat Enterprise Linux, and several versions of the Linux Kernel.

  • Can CVE-2023-4004 lead to data loss?

    Yes, CVE-2023-4004 can lead to data loss as it can result in memory corruption due to use-after-free errors.

  • What is the recommended action for servers running Linux Kernel version 6.5 or lower for CVE-2023-4004?

    It is recommended to upgrade to a patched version of the Linux Kernel to mitigate the risks associated with CVE-2023-4004.

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