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
Linux Linux kernel>=3.16<6.4
Linux Linux kernel>=3.16<4.14.322
Linux Linux kernel>=4.15<4.19.291
Linux Linux kernel>=4.20<5.4.251
Linux Linux kernel>=5.5<5.10.188
Linux Linux kernel>=5.11<5.15.118
Linux Linux kernel>=5.16<6.1.35
Linux Linux kernel>=6.2<6.3.9
Netapp H300s
Netapp H410c
Netapp H410s
Netapp H500s
Netapp H700s
redhat/kernel<6.4
6.4
debian/linux
5.10.223-1
5.10.226-1
6.1.115-1
6.1.119-1
6.11.10-1
6.12.5-1

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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