CVE-2024-40996: linux kernel — Fix

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.

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CVSS v3.1 Score

7.8

HIGH

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

Affected Products

Vendor	Product	Versions
linux	linux_kernel	6.1.86 — 6.1.96
linux	linux_kernel	6.6.27 — 6.6.36
linux	linux_kernel	6.9 — 6.9.7
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All

References

Advisories & Patches

https://git.kernel.org/stable/c/2bbe3e5a2f4ef69d13be54f1cf895b4658287080 https://git.kernel.org/stable/c/5e90258303a358e88737afb5048bee9113beea3a https://git.kernel.org/stable/c/7f9644782c559635bd676c12c59389a34ed7c866 https://git.kernel.org/stable/c/dacc15e9cb248d19e5fc63c54bef0b9b55007761 https://git.kernel.org/stable/c/2bbe3e5a2f4ef69d13be54f1cf895b4658287080 https://git.kernel.org/stable/c/5e90258303a358e88737afb5048bee9113beea3a https://git.kernel.org/stable/c/7f9644782c559635bd676c12c59389a34ed7c866 https://git.kernel.org/stable/c/dacc15e9cb248d19e5fc63c54bef0b9b55007761

Other References

https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html

Frequently Asked Questions

What is CVE-2024-40996? +

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. It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2024-40996? +

CVE-2024-40996 has a CVSS v3.1 score of 7.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2024-40996? +

CVE-2024-40996 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2024-40996? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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CVE-2024-40996