high
7.8
CWE
416
Advisory Published
CVE Published
Updated

CVE-2023-3390: Use-after-free in Linux kernel's netfilter subsystem

First published: Wed Jun 07 2023(Updated: )

A flaw in the Linux Kernel found in the Netfilter nf_tables (net/netfilter/nf_tables_api.c). It can lead to use after free vulnerability in nftables when handling sets that are both named and anonymous in batch requests. Nftables allows creating a named set that can be also marked as anonymous by setting the NFT_SET_ANONYMOUS flag. When a rule referencing this malformed set is destroyed, the set gets destroyed as well, as the set is marked anonymous. It is possible to get nftables to destroy the rule, by mangling certain bytes within the rule's bytecode. As this is a named set, the set can be referenced in a different rule at which point it triggers a use after free. The caveat is that all of this needs to be performed in a batch transaction. This is because the reference of any set created in a batch transaction remains in the transactions list even after the set is destroyed. Reference: <a href="https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1240eb93f0616b21c675416516ff3d74798fdc97">https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1240eb93f0616b21c675416516ff3d74798fdc97</a>

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

Affected SoftwareAffected VersionHow to fix
redhat/kernel<6.4
6.4
Linux Kernel>=3.16<4.14.322
Linux Kernel>=4.15<4.19.291
Linux Kernel>=4.20<5.4.251
Linux Kernel>=5.5<5.10.188
Linux Kernel>=5.11<5.15.118
Linux Kernel>=5.16<6.1.35
Linux Kernel>=6.2<6.3.9
netapp h300s
netapp h410c
netapp h410s
netapp h500s
netapp h700s
Linux Kernel>=3.16<6.4
debian/linux
5.10.223-1
5.10.226-1
6.1.123-1
6.1.128-1
6.12.12-1
6.12.15-1

Remedy

https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=1240eb93f0616b21c675416516ff3d74798fdc97

Remedy

https://kernel.dance/1240eb93f0616b21c675416516ff3d74798fdc97

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)

Peer vulnerabilities

(Found alongside the following vulnerabilities)

Frequently Asked Questions

  • What is the severity of CVE-2023-3390?

    CVE-2023-3390 has a medium severity rating, indicating a significant impact on affected systems.

  • How do I fix CVE-2023-3390?

    To fix CVE-2023-3390, update your Linux Kernel to the latest versions specified in your distribution's release notes.

  • Which systems are affected by CVE-2023-3390?

    CVE-2023-3390 affects various versions of the Linux Kernel, specifically those ranging from 3.16 to 6.4.

  • What type of vulnerability is CVE-2023-3390?

    CVE-2023-3390 is a use-after-free vulnerability specifically occurring in the Netfilter nf_tables implementation.

  • Can CVE-2023-3390 lead to remote code execution?

    Yes, CVE-2023-3390 could potentially allow an attacker to execute arbitrary code on affected systems.

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