high
7.8
CWE
416
Advisory Published
CVE Published
Updated

CVE-2023-32233: [CVE-2023-32233] Linux kernel use-after-free in Netfilter nf_tables when processing batch requests can be abused to perform arbitrary reads and writes in kernel memory

First published: Mon May 08 2023(Updated: )

In the Linux kernel through 6.3.1, a use-after-free in Netfilter nf_tables when processing batch requests can be abused to perform arbitrary read and write operations on kernel memory. Unprivileged local users can obtain root privileges. This occurs because anonymous sets are mishandled.

Credit: cve@mitre.org cve@mitre.org cve@mitre.org

Affected SoftwareAffected VersionHow to fix
IBM QRadar Network Packet Capture<=7.5.0 - 7.5.0 Update Package 7
redhat/kernel<6.4
6.4
Linux Kernel>=3.13<4.14.315
Linux Kernel>=4.15<4.19.283
Linux Kernel>=4.20<5.4.243
Linux Kernel>=5.5<5.10.180
Linux Kernel>=5.11<5.15.111
Linux Kernel>=5.16<6.1.28
Linux Kernel>=6.2<6.2.15
Linux Kernel>=6.3<6.3.2
Red Hat Enterprise Linux=7.0
Red Hat Enterprise Linux=8.0
Red Hat Enterprise Linux=9.0
netapp hci baseboard management controller=h300s
netapp hci baseboard management controller=h410c
netapp hci baseboard management controller=h410s
netapp hci baseboard management controller=h500s
netapp hci baseboard management controller=h700s
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

http://packetstormsecurity.com/files/173087/Kernel-Live-Patch-Security-Notice-LSN-0095-1.html

Remedy

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=c1592a89942e9678f7d9c8030efa777c0d57edab

Remedy

https://github.com/torvalds/linux/commit/c1592a89942e9678f7d9c8030efa777c0d57edab

Remedy

https://www.openwall.com/lists/oss-security/2023/05/08/4

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

Never miss a vulnerability like this again

Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.

Read MoreStart Free Trial

Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is the severity of CVE-2023-32233?

    CVE-2023-32233 has been classified as a critical vulnerability due to the potential for unprivileged local users to obtain root privileges.

  • How do I fix CVE-2023-32233?

    To fix CVE-2023-32233, update the Linux kernel to version 6.3.2 or later, or apply specific patches provided by your Linux distribution.

  • Which systems are affected by CVE-2023-32233?

    CVE-2023-32233 impacts various versions of the Linux kernel, specifically versions prior to 6.3.2, including several distributions like Red Hat and Debian.

  • What type of vulnerability is CVE-2023-32233?

    CVE-2023-32233 is a use-after-free vulnerability in the Netfilter nf_tables subsystem of the Linux kernel.

  • Can CVE-2023-32233 be exploited remotely?

    CVE-2023-32233 cannot be exploited remotely as it requires unprivileged local users to access the vulnerable system.

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2025 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203