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Tool Directory

CVE-2023-1829

HighPublished

Use-after-free in tcindex (traffic control index filter) in the Linux Kernel

Published: Apr 12, 2023
Updated: Jul 29, 2026
Assigning CNA: Google
Evidence observed: Aug 8, 2026

Primary CVSS

7.8/ 10High

nvd · CVSS 3.1

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS probability estimate

1.0%

Low · next 30 days

Percentile: 61.9%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/ .

Sources

CVE-2023-1829Exploit
Linux kernel local privilege escalation exploit for CVE-2023-1829, targeting Ubuntu 22.04 with netfilter filter functions. Includes build instructions and PoC code.
CVEPoC
A collection of proof-of-concept exploit scripts written by the STAR Labs team for various CVEs that they discovered or found by others.

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