high
7.8
CWE
416
EPSS
0.042%
Advisory Published
CVE Published
Updated

CVE-2023-6111: Use-after-free in Linux kernel's netfilter: nf_tables component

First published: Tue Nov 14 2023(Updated: )

A use-after-free vulnerability in the Linux kernel's netfilter: nf_tables component can be exploited to achieve local privilege escalation. The function nft_trans_gc_catchall did not remove the catchall set element from the catchall_list when the argument sync is true, making it possible to free a catchall set element many times. We recommend upgrading past commit 93995bf4af2c5a99e2a87f0cd5ce547d31eb7630.

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

Affected SoftwareAffected VersionHow to fix
ubuntu/linux-hwe<6.7~
6.7~
ubuntu/linux-hwe-5.4<6.7~
6.7~
ubuntu/linux-hwe-5.15<6.7~
6.7~
ubuntu/linux-hwe-6.2<6.7~
6.7~
ubuntu/linux-lts-xenial<6.7~
6.7~
ubuntu/linux-kvm<6.7~
6.7~
ubuntu/linux-aws-5.4<6.7~
6.7~
ubuntu/linux-aws-5.15<6.7~
6.7~
ubuntu/linux-aws-6.2<6.7~
6.7~
ubuntu/linux-aws-hwe<6.7~
6.7~
ubuntu/linux-azure<6.7~
6.7~
ubuntu/linux-azure-4.15<6.7~
6.7~
ubuntu/linux-azure-5.4<6.7~
6.7~
ubuntu/linux-azure-5.15<6.7~
6.7~
ubuntu/linux-azure-6.2<6.7~
6.7~
ubuntu/linux-azure-fde<6.7~
6.7~
ubuntu/linux-azure-fde-5.15<6.7~
6.7~
ubuntu/linux-azure-fde-6.2<6.7~
6.7~
ubuntu/linux-bluefield<6.7~
6.7~
ubuntu/linux-fips<6.7~
6.7~
ubuntu/linux-gcp<6.7~
6.7~
ubuntu/linux-gcp-4.15<6.7~
6.7~
ubuntu/linux-gcp-5.4<6.7~
6.7~
ubuntu/linux-gcp-5.15<6.7~
6.7~
ubuntu/linux-gcp-5.19<6.7~
6.7~
ubuntu/linux-gke<6.7~
6.7~
ubuntu/linux-gkeop<6.7~
6.7~
ubuntu/linux-gkeop-5.15<6.7~
6.7~
ubuntu/linux-ibm<6.7~
6.7~
ubuntu/linux-ibm-5.4<6.7~
6.7~
ubuntu/linux-ibm-5.15<6.7~
6.7~
ubuntu/linux-intel-iotg<6.7~
6.7~
ubuntu/linux-intel-iotg-5.15<6.7~
6.7~
ubuntu/linux-iot<6.7~
6.7~
ubuntu/linux-laptop<6.7~
6.7~
ubuntu/linux-lowlatency<6.7~
6.7~
ubuntu/linux-lowlatency-hwe-5.15<6.7~
6.7~
ubuntu/linux-lowlatency-hwe-6.2<6.7~
6.7~
ubuntu/linux-nvidia<6.7~
6.7~
ubuntu/linux-nvidia-6.2<6.7~
6.7~
ubuntu/linux-oracle<6.7~
6.7~
ubuntu/linux-oracle-5.4<6.7~
6.7~
ubuntu/linux-oracle-5.15<6.7~
6.7~
ubuntu/linux-oem-6.1<6.7~
6.7~
ubuntu/linux-oem-6.1<6.1.0-1028.28
6.1.0-1028.28
ubuntu/linux-oem-6.5<6.7~
6.7~
ubuntu/linux-raspi<6.7~
6.7~
ubuntu/linux-raspi-5.4<6.7~
6.7~
ubuntu/linux-riscv<6.7~
6.7~
ubuntu/linux-riscv-5.15<6.7~
6.7~
ubuntu/linux-starfive<6.7~
6.7~
ubuntu/linux-starfive-6.2<6.7~
6.7~
ubuntu/linux-xilinx-zynqmp<6.7~
6.7~
ubuntu/linux<6.7~
6.7~
ubuntu/linux-aws<6.7~
6.7~
debian/linux
4.19.249-2
4.19.304-1
5.10.197-1
5.10.205-2
6.1.66-1
6.1.69-1
6.5.13-1
6.6.9-1
Linux Linux kernel>=6.6<6.7
Linux Linux kernel>=5.15.134<5.15.140
Linux Linux kernel>=6.1.56<6.1.64
Linux Linux kernel>=6.5.6<6.5.13
Linux Linux kernel>=6.6<6.6.3

Remedy

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=93995bf4af2c5a99e2a87f0cd5ce547d31eb7630

Remedy

https://kernel.dance/93995bf4af2c5a99e2a87f0cd5ce547d31eb7630

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/4a9e12ea7e70223555ec010bec9f711089ce96f6

Remedy

https://git.kernel.org/linus/93995bf4af2c5a99e2a87f0cd5ce547d31eb7630

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Reference Links

Parent vulnerabilities

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Frequently Asked Questions

  • What is the vulnerability ID for this vulnerability?

    The vulnerability ID for this vulnerability is CVE-2023-6111.

  • What is the title of this vulnerability?

    The title of this vulnerability is 'Use-after-free in Linux kernel's netfilter: nf_tables component'.

  • What is the severity level of this vulnerability?

    The severity level of this vulnerability is high (7.8).

  • How can this vulnerability be exploited?

    This vulnerability can be exploited to achieve local privilege escalation.

  • Is there any fix available for this vulnerability?

    Yes, a fix for this vulnerability is available. Please refer to the provided references for more information.

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