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CVE-2023-3609

7.8 · HIGH

A use-after-free vulnerability in the Linux kernel's net/sched: cls_u32 component can be exploited to achieve local privilege escalation.

Published Jul 21, 2023CWE-416EPSS 0.49%

Overview

CVE-2023-3609 is a high-severity vulnerability. It was published on July 21, 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 net/sched: cls_u32 component can be exploited to achieve local privilege escalation.

If tcf_change_indev() fails, u32_set_parms() will immediately return an error after incrementing or decrementing the reference counter in tcf_bind_filter(). If an attacker can control the reference counter and set it to zero, they can cause the reference to be freed, leading to a use-after-free vulnerability.

We recommend upgrading past commit 04c55383fa5689357bcdd2c8036725a55ed632bc.

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/175072/Kernel-Live-Patch-Security-Notice-LSN-0098-1.htmlRefpacketstormsecurity.com/files/175963/Kernel-Live-Patch-Security-Notice-LSN-0099-1.htmlRefgit.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=04c55383fa5689357bcdd2c8036725a55ed632bcRefkernel.dance/04c55383fa5689357bcdd2c8036725a55ed632bcReflists.debian.org/debian-lts-announce/2023/10/msg00027.htmlReflists.debian.org/debian-lts-announce/2024/01/msg00004.htmlRefsecurity.netapp.com/advisory/ntap-20230818-0005/Refwww.debian.org/security/2023/dsa-5480Refpacketstormsecurity.com/files/175072/Kernel-Live-Patch-Security-Notice-LSN-0098-1.htmlRefpacketstormsecurity.com/files/175963/Kernel-Live-Patch-Security-Notice-LSN-0099-1.html

How CyberStrike helps

Frequently asked questions

What is CVE-2023-3609?

CVE-2023-3609 is a high-severity vulnerability. It was published on July 21, 2023 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2023-3609?

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-2023-3609?

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-2023-3609?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2023-3609 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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