CVE-2026-31401

Kernel crash via unchecked HID-BPF return length

Published Apr 3, 2026 · Updated Apr 3, 2026

Out-of-bounds write in Linux Kernel allows local users with HID-BPF loading rights to crash the running kernel through a crafted program. hid_bpf_hw_request accepts the arbitrary positive length returned by dispatch_hid_bpf_raw_requests and passes it to memcpy without limiting it to the caller buffer. Loading the required HID-BPF program needs special local permissions; successful triggering overwrites kernel memory and can interrupt the host by crashing the running kernel.

CVSS severity7.8
High
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in Linux Kernel allows local users with HID-BPF loading rights to crash the running kernel through a crafted program. hid_bpf_hw_request accepts the arbitrary positive length returned by dispatch_hid_bpf_raw_requests and passes it to memcpy without limiting it to the caller buffer. Loading the required HID-BPF program needs special local permissions; successful triggering overwrites kernel memory and can interrupt the host by crashing the running kernel.

The record

CVE
CVE-2026-31401
Published
Apr 3, 2026
Updated
Apr 3, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-787, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 3, 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=6.11
  2. Affected versionversion=8bd0488b5ea58655ad6fdcbe0408ef49b16882b1 <2b658c1c442ec1cd9eec5ead98d68662c40fe645
  3. Affected versionversion=8bd0488b5ea58655ad6fdcbe0408ef49b16882b1 <73c5b5aea1c443239c8cb4191b4af7a4bd6fd7b1
  4. Affected versionversion=8bd0488b5ea58655ad6fdcbe0408ef49b16882b1 <d6efaa50af62fb0790dd1fd4e7e5506b46312510
  5. Affected versionversion=8bd0488b5ea58655ad6fdcbe0408ef49b16882b1 <eb57dae20fdf6f3069cdc07821fa3bb46de381d7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.11; version=8bd0488b5ea58655ad6fdcbe0408ef49b16882b1 <2b658c1c442ec1cd9eec5ead98d68662c40fe645; version=8bd0488b5ea58655ad6fdcbe0408ef49b16882b1 <73c5b5aea1c443239c8cb4191b4af7a4bd6fd7b1; version=8bd0488b5ea58655ad6fdcbe0408ef49b16882b1 <d6efaa50af62fb0790dd1fd4e7e5506b46312510; version=8bd0488b5ea58655ad6fdcbe0408ef49b16882b1 <eb57dae20fdf6f3069cdc07821fa3bb46de381d7

Published CVSS scores

7.8Canonical UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.0Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/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 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

CWE-787Out-of-bounds Write
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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Your stack

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