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CVE-2024-40909

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix a potential use-after-free in bpf_link_free() After commit 1a80dbcb2dba, bpf_link can be freed by link->ops->dealloc_d…

Published Jul 12, 2024CWE-416EPSS 0.28%

Overview

CVE-2024-40909 is a high-severity vulnerability. It was published on July 12, 2024 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

In the Linux kernel, the following vulnerability has been resolved:

bpf: Fix a potential use-after-free in bpf_link_free()

After commit 1a80dbcb2dba, bpf_link can be freed by

link->ops->dealloc_deferred, but the code still tests and uses

link->ops->dealloc afterward, which leads to a use-after-free as

reported by syzbot. Actually, one of them should be sufficient, so

just call one of them instead of both. Also add a WARN_ON() in case

of any problematic implementation.

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

Refgit.kernel.org/stable/c/2884dc7d08d98a89d8d65121524bb7533183a63aRefgit.kernel.org/stable/c/91cff53136daeff50816b0baeafd38a6976f6209Refgit.kernel.org/stable/c/fa97b8fed9896f1e89cb657513e483a152d4c382Refgit.kernel.org/stable/c/2884dc7d08d98a89d8d65121524bb7533183a63aRefgit.kernel.org/stable/c/91cff53136daeff50816b0baeafd38a6976f6209Refgit.kernel.org/stable/c/fa97b8fed9896f1e89cb657513e483a152d4c382

How CyberStrike helps

Frequently asked questions

What is CVE-2024-40909?

CVE-2024-40909 is a high-severity vulnerability. It was published on July 12, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2024-40909?

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-2024-40909?

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-2024-40909?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2024-40909 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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