high
7.8
CWE
416 415
Advisory Published
Updated
Advisory Published

CVE-2023-1829: (Pwn2Own) Canonical Ubuntu tcindex Double-Free Local Privilege Escalation Vulnerability

First published: Wed Apr 12 2023(Updated: )

A use-after-free vulnerability in the Linux Kernel traffic control index filter (tcindex) can be exploited to achieve local privilege escalation. The tcindex_delete function which does not properly deactivate filters in case of a perfect hashes while deleting the underlying structure which can later lead to double freeing the structure. A local attacker user can use this vulnerability to elevate its privileges to root. We recommend upgrading past commit 8c710f75256bb3cf05ac7b1672c82b92c43f3d28.

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

Affected SoftwareAffected VersionHow to fix
Linux Kernel<4.14.308
Linux Kernel>=4.15<4.19.276
Linux Kernel>=4.20<5.4.235
Linux Kernel>=5.5<5.10.173
Linux Kernel>=5.11<5.15.100
Linux Kernel>=5.16<6.1.18
Linux Kernel>=6.2<6.2.5
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
Ubuntu
IBM Security Verify Governance - Identity Manager<=ISVG 10.0.2
IBM Security Verify Governance, Identity Manager<=ISVG 10.0.2
Linux kernel<4.14.308
Linux kernel>=4.15<4.19.276
Linux kernel>=4.20<5.4.235
Linux kernel>=5.5<5.10.173
Linux kernel>=5.11<5.15.100
Linux kernel>=5.16<6.1.18
Linux kernel>=6.2<6.2.5

Remedy

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=8c710f75256bb3cf05ac7b1672c82b92c43f3d28

Remedy

https://kernel.dance/#8c710f75256bb3cf05ac7b1672c82b92c43f3d28

Remedy

Block autoloading the cls_tcindex module by adding the following lines to /etc/modprobe.d/blacklist-tcindex.conf: blacklist cls_tcindex

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-2023-1829?

    CVE-2023-1829 is considered a high-severity vulnerability that can lead to local privilege escalation in affected systems.

  • How do I fix CVE-2023-1829?

    To remediate CVE-2023-1829, update your Linux kernel or IBM Security Verify Governance, Identity Manager components to the patched versions provided by the vendor.

  • Which Linux kernel versions are affected by CVE-2023-1829?

    CVE-2023-1829 affects Linux kernel versions prior to 4.14.308 and versions between 4.15 and up to 6.2.5.

  • What products are affected by CVE-2023-1829?

    CVE-2023-1829 impacts IBM Security Verify Governance components and multiple versions of the Linux kernel.

  • Can CVE-2023-1829 be exploited remotely?

    CVE-2023-1829 is a local privilege escalation vulnerability, which means it requires local access to the affected system for exploitation.

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