CVE-2024-38566

Local integrity compromise via invalid socket pointer assumption

Published Jun 19, 2024 · Updated May 11, 2026

A BPF verifier flaw in Linux kernel 6.4 through affected branches allows local users to compromise kernel integrity via crafted BPF. In kernel/bpf/verifier.c, the verifier treats a trusted, non-NULL struct socket as proof that socket->sk is also valid, although the field can remain NULL when a newly created socket reaches the LSM socket_accept hook. Reachability requires local access capable of loading and exercising the relevant BPF LSM program; the upstream notice does not publish a complete exploit sequence.

CVSS severity5.5
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A BPF verifier flaw in Linux kernel 6.4 through affected branches allows local users to compromise kernel integrity via crafted BPF. In kernel/bpf/verifier.c, the verifier treats a trusted, non-NULL struct socket as proof that socket->sk is also valid, although the field can remain NULL when a newly created socket reaches the LSM socket_accept hook. Reachability requires local access capable of loading and exercising the relevant BPF LSM program; the upstream notice does not publish a complete exploit sequence.

The record

CVE
CVE-2024-38566
Published
Jun 19, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 19, 2024CVE publishedPublication date reported by the CVE source.
  2. May 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.4
  2. Affected versionversion=6fcd486b3a0a628c41f12b3a7329a18a2c74b351 <0db63c0b86e981a1e97d2596d64ceceba1a5470e
  3. Affected versionversion=6fcd486b3a0a628c41f12b3a7329a18a2c74b351 <39f8a29330f433000e716eefc4b9abda05b71a82
  4. Affected versionversion=6fcd486b3a0a628c41f12b3a7329a18a2c74b351 <6f5ae91172a93abac9720ba94edf3ec8f4d7f24f
  5. Affected versionversion=6fcd486b3a0a628c41f12b3a7329a18a2c74b351 <c58ccdd2483a1d990748cdaf94206b5d5986a001

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.4; version=6fcd486b3a0a628c41f12b3a7329a18a2c74b351 <0db63c0b86e981a1e97d2596d64ceceba1a5470e; version=6fcd486b3a0a628c41f12b3a7329a18a2c74b351 <39f8a29330f433000e716eefc4b9abda05b71a82; version=6fcd486b3a0a628c41f12b3a7329a18a2c74b351 <6f5ae91172a93abac9720ba94edf3ec8f4d7f24f; version=6fcd486b3a0a628c41f12b3a7329a18a2c74b351 <c58ccdd2483a1d990748cdaf94206b5d5986a001

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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