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CVE-2023-6817

7.8 · HIGH

A use-after-free vulnerability in the Linux kernel's netfilter: nf_tables component can be exploited to achieve local privilege escalation.

Published Dec 18, 2023CWE-416EPSS 0.33%

Overview

CVE-2023-6817 is a high-severity vulnerability. It was published on December 18, 2023 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

A use-after-free vulnerability in the Linux kernel's netfilter: nf_tables component can be exploited to achieve local privilege escalation.

The function nft_pipapo_walk did not skip inactive elements during set walk which could lead double deactivations of PIPAPO (Pile Packet Policies) elements, leading to use-after-free.

We recommend upgrading past commit 317eb9685095678f2c9f5a8189de698c5354316a.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refpacketstormsecurity.com/files/177029/Kernel-Live-Patch-Security-Notice-LSN-0100-1.htmlRefwww.openwall.com/lists/oss-security/2023/12/22/13Refwww.openwall.com/lists/oss-security/2023/12/22/6Refgit.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=317eb9685095678f2c9f5a8189de698c5354316aRefkernel.dance/317eb9685095678f2c9f5a8189de698c5354316aReflists.debian.org/debian-lts-announce/2024/01/msg00005.htmlRefpacketstormsecurity.com/files/177029/Kernel-Live-Patch-Security-Notice-LSN-0100-1.htmlRefwww.openwall.com/lists/oss-security/2023/12/22/13Refwww.openwall.com/lists/oss-security/2023/12/22/6Refgit.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=317eb9685095678f2c9f5a8189de698c5354316a

How CyberStrike helps

Frequently asked questions

What is CVE-2023-6817?

CVE-2023-6817 is a high-severity vulnerability. It was published on December 18, 2023 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2023-6817?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2023-6817?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2023-6817?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2023-6817 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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