high
7.8
CWE
787
Advisory Published
Updated
Advisory Published

CVE-2023-35001: (Pwn2Own) Linux Kernel nftables Incorrect Pointer Scaling Local Privilege Escalation Vulnerability

First published: Wed Jul 05 2023(Updated: )

Last updated 11 April 2025

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

Affected SoftwareAffected VersionHow to fix
IBM QRadar Network Packet Capture<=7.5.0 - 7.5.0 Update Package 7
Red Hat Kernel-devel
Linux Kernel>=3.13<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<5.15.121
Linux Kernel>=5.16<6.1.39
Linux Kernel>=6.2<6.4.4
Debian Linux=11.0
Red Hat Fedora=37
Red Hat Fedora=38
NetApp H300S Firmware
NetApp H410C Firmware
NetApp H410S Firmware
NetApp H500e Firmware
NetApp H700S
Linux Kernel=3.13-rc1
debian/linux
5.10.223-1
5.10.234-1
6.1.129-1
6.1.133-1
6.12.21-1
6.12.22-1

Remedy

https://lore.kernel.org/netfilter-devel/20230705121515.747251-1-cascardo@canonical.com/T/

Remedy

https://lists.debian.org/debian-lts-announce/2023/08/msg00001.html

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)

Frequently Asked Questions

  • What is the severity of CVE-2023-35001?

    CVE-2023-35001 is considered a high-severity vulnerability that allows local authenticated attackers to gain elevated privileges.

  • How do I fix CVE-2023-35001?

    To fix CVE-2023-35001, update to the latest kernel versions or apply available patches from your Linux distribution.

  • Which systems are affected by CVE-2023-35001?

    CVE-2023-35001 affects various versions of the Linux Kernel, including those from 3.13 up to 6.4.4, as well as specific products like IBM QRadar Network Packet Capture.

  • Can CVE-2023-35001 be exploited remotely?

    No, CVE-2023-35001 requires local authenticated access, which limits the potential for remote exploitation.

  • What should I do if my system is vulnerable to CVE-2023-35001?

    If your system is vulnerable to CVE-2023-35001, prioritize updating your kernel and monitoring for unusual behavior on your system.

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