CVE-2026-92486Hinoki check available

Denial of service via task-work callback ABI mismatch

Published Sep 17, 2026 · Updated Sep 17, 2026

DoS in Linux 6.18 BPF task work allows local users to trigger a kCFI failure through a scheduled BPF subprogram callback. In kernel/bpf/helpers.c, bpf_task_work_callback invokes the program-supplied callback through a three-argument pointer instead of the five-argument bpf_callback_t ABI. Triggering requires privileged BPF access and kCFI enforcement; the published evidence does not establish a uniform crash or reboot outcome.

CVSS severity4.4
Medium
EPSS probability0.21%
Next 30 days · Oct 20, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

DoS in Linux 6.18 BPF task work allows local users to trigger a kCFI failure through a scheduled BPF subprogram callback. In kernel/bpf/helpers.c, bpf_task_work_callback invokes the program-supplied callback through a three-argument pointer instead of the five-argument bpf_callback_t ABI. Triggering requires privileged BPF access and kCFI enforcement; the published evidence does not establish a uniform crash or reboot outcome.

The record

CVE
CVE-2026-92486
Published
Sep 17, 2026
Updated
Sep 17, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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=38aa7003e369802f81a078f6673d10d97013f04f <2805abd089576799b15092949420e3f8ba97fabd
  2. Affected versionversion=38aa7003e369802f81a078f6673d10d97013f04f <85a33c910edc3651f68b17ae3c597c012545958f
  3. Affected versionversion=38aa7003e369802f81a078f6673d10d97013f04f <a2cbab47f44e9ea8c5a161ecba1b6bb8535771eb
  4. Affected versionversion=6.18

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=38aa7003e369802f81a078f6673d10d97013f04f <2805abd089576799b15092949420e3f8ba97fabd; version=38aa7003e369802f81a078f6673d10d97013f04f <85a33c910edc3651f68b17ae3c597c012545958f; version=38aa7003e369802f81a078f6673d10d97013f04f <a2cbab47f44e9ea8c5a161ecba1b6bb8535771eb; version=6.18

Published CVSS scores

4.4Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
4.4SUSECVSS:3.1/AV:L/AC:L/PR:H/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.

Activity data is delayed. The latest report is Sep 28, 2026.

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

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application 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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