CVE-2026-46136

Driver initialization failure via unchecked CLC rule length

Published May 28, 2026 · Updated May 28, 2026

Integer underflow in the Linux Kernel mt7921 wireless driver allows local users to cause driver initialization failure. The __mt7921_mcu_set_clc loop subtracts a CLC rule length and header size from unsigned buf_len without first verifying that the combined offset fits. Reachability requires an affected kernel and MT7921 adapter; the reported result is an almost infinite loop or invalid power setting, with no reported code execution.

CVSS severity7.8
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer underflow in the Linux Kernel mt7921 wireless driver allows local users to cause driver initialization failure. The __mt7921_mcu_set_clc loop subtracts a CLC rule length and header size from unsigned buf_len without first verifying that the combined offset fits. Reachability requires an affected kernel and MT7921 adapter; the reported result is an almost infinite loop or invalid power setting, with no reported code execution.

The record

CVE
CVE-2026-46136
Published
May 28, 2026
Updated
May 28, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-787, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 28, 2026CVE publishedPublication date reported by the CVE source.
  2. May 28, 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=0c9318d49e501a5d50b02bd91a4813bde2353488
  2. Affected versionversion=15173a1697236793e9e900b82fece6f99d41b2a7 <e451c325b000b9a0081fd93bc6d103d6943d4b55
  3. Affected versionversion=5c8cac512844ad593d31258e215908014381bee2
  4. Affected versionversion=6.1.75 <6.2
  5. Affected versionversion=6.6.14 <6.6.140
  6. Affected versionversion=6.7.2 <6.8
  7. Affected versionversion=6.8
  8. Affected versionversion=fa6ad88e023ddfa6c5dcdb466d159e89f451e305 <0aa63d33742b805d1a218d18d12b983cce4b2f7b
  9. Affected versionversion=fa6ad88e023ddfa6c5dcdb466d159e89f451e305 <5373f8b19e568b5c217832b9bbef165bd2b2df14
  10. Affected versionversion=fa6ad88e023ddfa6c5dcdb466d159e89f451e305 <90cc573fd2f46ddbc2c329e7814b5ba3deb7b939
  11. Affected versionversion=fa6ad88e023ddfa6c5dcdb466d159e89f451e305 <a0111847f0b4f6023f6dd320114697514e024ba3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=0c9318d49e501a5d50b02bd91a4813bde2353488; version=15173a1697236793e9e900b82fece6f99d41b2a7 <e451c325b000b9a0081fd93bc6d103d6943d4b55; version=5c8cac512844ad593d31258e215908014381bee2; version=6.1.75 <6.2; version=6.6.14 <6.6.140; version=6.7.2 <6.8; version=6.8; version=fa6ad88e023ddfa6c5dcdb466d159e89f451e305 <0aa63d33742b805d1a218d18d12b983cce4b2f7b; version=fa6ad88e023ddfa6c5dcdb466d159e89f451e305 <5373f8b19e568b5c217832b9bbef165bd2b2df14; version=fa6ad88e023ddfa6c5dcdb466d159e89f451e305 <90cc573fd2f46ddbc2c329e7814b5ba3deb7b939; version=fa6ad88e023ddfa6c5dcdb466d159e89f451e305 <a0111847f0b4f6023f6dd320114697514e024ba3

Published CVSS scores

5.5Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.8NIST National Vulnerability DatabaseCVSS:3.1/AV:L/AC:L/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.

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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
T1499.004Endpoint 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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