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CVE-2024-40996

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: bpf: Avoid splat in pskb_pull_reason syzkaller builds (CONFIG_DEBUG_NET=y) frequently trigger a debug hint in pskb_may_pull.

Published Jul 12, 2024EPSS 0.28%

Overview

CVE-2024-40996 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: Avoid splat in pskb_pull_reason

syzkaller builds (CONFIG_DEBUG_NET=y) frequently trigger a debug

hint in pskb_may_pull.

We'd like to retain this debug check because it might hint at integer

overflows and other issues (kernel code should pull headers, not huge

value).

In bpf case, this splat isn't interesting at all: such (nonsensical)

bpf programs are typically generated by a fuzzer anyway.

Do what Eric suggested and suppress such warning.

For CONFIG_DEBUG_NET=n we don't need the extra check because

pskb_may_pull will do the right thing: return an error without the

WARN() backtrace.

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/2bbe3e5a2f4ef69d13be54f1cf895b4658287080Refgit.kernel.org/stable/c/5e90258303a358e88737afb5048bee9113beea3aRefgit.kernel.org/stable/c/7f9644782c559635bd676c12c59389a34ed7c866Refgit.kernel.org/stable/c/dacc15e9cb248d19e5fc63c54bef0b9b55007761Refgit.kernel.org/stable/c/2bbe3e5a2f4ef69d13be54f1cf895b4658287080Refgit.kernel.org/stable/c/5e90258303a358e88737afb5048bee9113beea3aRefgit.kernel.org/stable/c/7f9644782c559635bd676c12c59389a34ed7c866Refgit.kernel.org/stable/c/dacc15e9cb248d19e5fc63c54bef0b9b55007761Reflists.debian.org/debian-lts-announce/2025/01/msg00001.html

How CyberStrike helps

Frequently asked questions

What is CVE-2024-40996?

CVE-2024-40996 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-2024-40996?

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-2024-40996?

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-2024-40996?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2024-40996 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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