CVE-2024-26591

Local kernel crash via invalid BPF re-attachment

Published Feb 22, 2024 · Updated May 11, 2026

NULL pointer dereference in the Linux kernel's BPF tracing subsystem allows local users to crash the system with crafted link requests. In bpf_tracing_prog_attach, repeated link creation without target_fd leaves tgt_prog and attach_btf null, but btf_obj_id dereferences the missing state. Local users need permission to load BPF programs; the demonstrated result is a kernel crash with no reported data access or modification.

CVSS severity5.5
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in the Linux kernel's BPF tracing subsystem allows local users to crash the system with crafted link requests. In bpf_tracing_prog_attach, repeated link creation without target_fd leaves tgt_prog and attach_btf null, but btf_obj_id dereferences the missing state. Local users need permission to load BPF programs; the demonstrated result is a kernel crash with no reported data access or modification.

The record

CVE
CVE-2024-26591
Published
Feb 22, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 22, 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=5.13
  2. Affected versionversion=f3a95075549e0e5c36db922caf86847db7a35403 <50ae82f080cf87e84828f066c31723b781d68f5b
  3. Affected versionversion=f3a95075549e0e5c36db922caf86847db7a35403 <6cc9c0af0aa06f781fa515a1734b1a4239dfd2c0
  4. Affected versionversion=f3a95075549e0e5c36db922caf86847db7a35403 <715d82ba636cb3629a6e18a33bb9dbe53f9936ee
  5. Affected versionversion=f3a95075549e0e5c36db922caf86847db7a35403 <8c8bcd45e9b10eef12321f08d2e5be33d615509c
  6. Affected versionversion=f3a95075549e0e5c36db922caf86847db7a35403 <a7b98aa10f895e2569403896f2d19b73b6c95653

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.13; version=f3a95075549e0e5c36db922caf86847db7a35403 <50ae82f080cf87e84828f066c31723b781d68f5b; version=f3a95075549e0e5c36db922caf86847db7a35403 <6cc9c0af0aa06f781fa515a1734b1a4239dfd2c0; version=f3a95075549e0e5c36db922caf86847db7a35403 <715d82ba636cb3629a6e18a33bb9dbe53f9936ee; version=f3a95075549e0e5c36db922caf86847db7a35403 <8c8bcd45e9b10eef12321f08d2e5be33d615509c; version=f3a95075549e0e5c36db922caf86847db7a35403 <a7b98aa10f895e2569403896f2d19b73b6c95653

Published CVSS scores

5.5NIST NVDCVSS: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

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

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
T1499.004Application or System Exploitation

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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