CVE-2024-26731Network attack vector

Kernel oops via concurrent sockmap callback teardown

Published Apr 3, 2024 · Updated May 23, 2026

NULL pointer dereference in the Linux kernel allows attackers to trigger a kernel oops by racing BPF sockmap verdict callbacks. In net/core/skmsg.c, concurrent sk_psock_verdict_data_ready() and sk_psock_stop_verdict() calls can clear saved_data_ready before an indirect call through it. Triggering requires the affected BPF sockmap verdict path; a panic-on-oops policy can turn the fault into a host reboot.

CVSS severity5.3
Medium
EPSS probability0.83%
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 allows attackers to trigger a kernel oops by racing BPF sockmap verdict callbacks. In net/core/skmsg.c, concurrent sk_psock_verdict_data_ready() and sk_psock_stop_verdict() calls can clear saved_data_ready before an indirect call through it. Triggering requires the affected BPF sockmap verdict path; a panic-on-oops policy can turn the fault into a host reboot.

The record

CVE
CVE-2024-26731
Published
Apr 3, 2024
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 3, 2024CVE publishedPublication date reported by the CVE source.
  2. May 23, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=6.1.32 <6.1.80
  2. Affected versionversion=6.3.6 <6.4
  3. Affected versionversion=6.4
  4. Affected versionversion=6df7f764cd3cf5a03a4a47b23be47e57e41fcd85 <4cd12c6065dfcdeba10f49949bffcf383b3952d8
  5. Affected versionversion=6df7f764cd3cf5a03a4a47b23be47e57e41fcd85 <9b099ed46dcaf1403c531ff02c3d7400fa37fa26
  6. Affected versionversion=6df7f764cd3cf5a03a4a47b23be47e57e41fcd85 <d61608a4e394f23e0dca099df9eb8e555453d949
  7. Affected versionversion=d3cbd7c571446a876aefd8320500300b2c951c58
  8. Affected versionversion=dd628fc697ee59b76bd3877c4bd13f07ccc3776f <4588b13abcbd561ec67f5b3c1cb2eff690990a54

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.1.32 <6.1.80; version=6.3.6 <6.4; version=6.4; version=6df7f764cd3cf5a03a4a47b23be47e57e41fcd85 <4cd12c6065dfcdeba10f49949bffcf383b3952d8; version=6df7f764cd3cf5a03a4a47b23be47e57e41fcd85 <9b099ed46dcaf1403c531ff02c3d7400fa37fa26; version=6df7f764cd3cf5a03a4a47b23be47e57e41fcd85 <d61608a4e394f23e0dca099df9eb8e555453d949; version=d3cbd7c571446a876aefd8320500300b2c951c58; version=dd628fc697ee59b76bd3877c4bd13f07ccc3776f <4588b13abcbd561ec67f5b3c1cb2eff690990a54

Published CVSS scores

5.3UbuntuCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499.004Endpoint Denial of Service: Application or System Exploitation

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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