Riskcovery

CVE-2024-40996

bpf: Avoid splat in pskb_pull_reason

State
Published
Severity
Not scored
Published
Jul 12, 2024
Updated
May 23, 2026
Reserved
Jul 12, 2024

Read the record on cve.org

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 8af60bb2b215f478b886f1d6d302fefa7f0b917d to before dacc15e9cb248d19e5fc63c54bef0b9b55007761Affected
  • 1b2b26595bb09febf14c5444c873ac4ec90a5a77 to before 7f9644782c559635bd676c12c59389a34ed7c866Affected
  • 219eee9c0d16f1b754a8b85275854ab17df0850a to before 5e90258303a358e88737afb5048bee9113beea3aAffected
  • 219eee9c0d16f1b754a8b85275854ab17df0850a to before 2bbe3e5a2f4ef69d13be54f1cf895b4658287080Affected
  • fff05b2b004d9a8a2416d08647f3dc9068e357c8Affected
  • 6.1.86 to before 6.1.96Affected
  • 6.6.27 to before 6.6.36Affected
  • 6.8.6 to before 6.9Affected
LinuxLinux
  • 6.9Affected
  • before 6.9Not affected
  • 6.1.96 through 6.1.*Not affected
  • 6.6.36 through 6.6.*Not affected
  • 6.9.7 through 6.9.*Not affected
  • 6.10 and laterNot affected

References

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