high
7.8
CWE
416
Advisory Published
Updated

CVE-2023-3609: Use-after-free in Linux kernel's net/sched: cls_u32 component

First published: Fri Jul 21 2023(Updated: )

A flaw in the Linux Kernel found. A use-after-free vulnerability in the Linux kernel's net/sched: cls_u32 component can be exploited to achieve local privilege escalation. If tcf_change_indev() fails, u32_set_parms() will immediately return an error after incrementing or decrementing the reference counter in tcf_bind_filter(). If an attacker can control the reference counter and set it to zero, they can cause the reference to be freed, leading to a use-after-free vulnerability. Reference: <a href="https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=04c55383fa5689357bcdd2c8036725a55ed632bc">https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=04c55383fa5689357bcdd2c8036725a55ed632bc</a>

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

Affected SoftwareAffected VersionHow to fix
Linux Linux kernel>=4.14<6.4
Linux Linux kernel=6.4-rc1
Linux Linux kernel=6.4-rc2
Linux Linux kernel=6.4-rc3
Linux Linux kernel=6.4-rc4
Linux Linux kernel=6.4-rc5
Linux Linux kernel=6.4-rc6
Debian Debian Linux=10.0
Debian Debian Linux=11.0
IBM QRadar Network Packet Capture<=7.5.0 - 7.5.0 Update Package 7
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/torvalds/linux.git/commit?id=04c55383fa5689357bcdd2c8036725a55ed632bc

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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