CVE-2024-43837

Kernel crash via unattached BPF extension program

Published Aug 17, 2024 · Updated May 11, 2026

A null pointer dereference in the Linux BPF verifier allows local users to crash the kernel by loading an unattached extension program. The resolve_prog_type() helper dereferences prog->aux->dst_prog while resolving BPF_PROG_TYPE_EXT even when attach_prog_fd was omitted and dst_prog is null. Triggering the fault requires local access to the bpf() system call; systems that disable unprivileged BPF restrict that path to CAP_SYS_ADMIN or CAP_BPF holders.

CVSS severity5.5
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A null pointer dereference in the Linux BPF verifier allows local users to crash the kernel by loading an unattached extension program. The resolve_prog_type() helper dereferences prog->aux->dst_prog while resolving BPF_PROG_TYPE_EXT even when attach_prog_fd was omitted and dst_prog is null. Triggering the fault requires local access to the bpf() system call; systems that disable unprivileged BPF restrict that path to CAP_SYS_ADMIN or CAP_BPF holders.

The record

CVE
CVE-2024-43837
Published
Aug 17, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 17, 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=4a9c7bbe2ed4d2b240674b1fb606c41d3940c412 <9d40fd516aeae6779e3c84c6b96700ca76285847
  2. Affected versionversion=4a9c7bbe2ed4d2b240674b1fb606c41d3940c412 <b29a880bb145e1f1c1df5ab88ed26b1495ff9f09
  3. Affected versionversion=4a9c7bbe2ed4d2b240674b1fb606c41d3940c412 <f7866c35873377313ff94398f17d425b28b71de1
  4. Affected versionversion=4a9c7bbe2ed4d2b240674b1fb606c41d3940c412 <fcac5feb06f31ee4c88bca9bf98d8bc3ca7d2615
  5. Affected versionversion=5.18

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4a9c7bbe2ed4d2b240674b1fb606c41d3940c412 <9d40fd516aeae6779e3c84c6b96700ca76285847; version=4a9c7bbe2ed4d2b240674b1fb606c41d3940c412 <b29a880bb145e1f1c1df5ab88ed26b1495ff9f09; version=4a9c7bbe2ed4d2b240674b1fb606c41d3940c412 <f7866c35873377313ff94398f17d425b28b71de1; version=4a9c7bbe2ed4d2b240674b1fb606c41d3940c412 <fcac5feb06f31ee4c88bca9bf98d8bc3ca7d2615; version=5.18

Published CVSS scores

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

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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