7.8
CWE
416
Advisory Published
Advisory Published
Updated

CVE-2023-31248: (Pwn2Own) Linux Kernel nftables Use-After-Free Local Privilege Escalation Vulnerability

First published: Wed Jul 05 2023(Updated: )

Last updated 29 November 2024

Credit: security@ubuntu.com security@ubuntu.com security@ubuntu.com

Affected SoftwareAffected VersionHow to fix
Linux Linux kernel=5.9.0-rc1
Fedoraproject Fedora=37
Fedoraproject Fedora=38
Debian Debian Linux=11.0
Linux kernel
Linux Linux kernel>=5.9<5.10.188
Linux Linux kernel>=5.11<5.15.121
Linux Linux kernel>=5.16<6.1.39
Linux Linux kernel>=6.2<6.4.4
Canonical Ubuntu Linux=14.04
Canonical Ubuntu Linux=16.04
Canonical Ubuntu Linux=18.04
Canonical Ubuntu Linux=20.04
Canonical Ubuntu Linux=22.04
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

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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