CVE-2026-68406

Local service interruption via unchecked FTM preamble

Published Aug 10, 2026 · Updated Aug 10, 2026

Improper input validation in Linux kernel cfg80211 allows local users to interrupt service via a malformed PMSR FTM request. The PMSR FTM parser accepts a preamble beyond the nl80211 enumeration and uses it as the shift count in a capability BIT test instead of rejecting it through the nested attribute policy. Exploitation requires local low-privilege access; published evidence establishes availability impact but does not identify whether the resulting failure is a hang, crash, or reboot.

CVSS severity5.5
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Linux kernel cfg80211 allows local users to interrupt service via a malformed PMSR FTM request. The PMSR FTM parser accepts a preamble beyond the nl80211 enumeration and uses it as the shift count in a capability BIT test instead of rejecting it through the nested attribute policy. Exploitation requires local low-privilege access; published evidence establishes availability impact but does not identify whether the resulting failure is a hang, crash, or reboot.

The record

CVE
CVE-2026-68406
Published
Aug 10, 2026
Updated
Aug 10, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 10, 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=5.0
  2. Affected versionversion=9bb7e0f24e7e7d00daa1219b14539e2e602649b2 <36230936468f0ba4930e94aef496fc229d4bb951
  3. Affected versionversion=9bb7e0f24e7e7d00daa1219b14539e2e602649b2 <44ea65d779e2d23b2264fea6af2d0c666a3ec9fb
  4. Affected versionversion=9bb7e0f24e7e7d00daa1219b14539e2e602649b2 <58320cb47df2accc7a20bb72c0150280732fa58f
  5. Affected versionversion=9bb7e0f24e7e7d00daa1219b14539e2e602649b2 <922d71fbaf99c1d5318151a0cb0a42ad448d07d9
  6. Affected versionversion=9bb7e0f24e7e7d00daa1219b14539e2e602649b2 <cfbda103aeae61071a122a6fc2bfe98cffbd7165

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.0; version=9bb7e0f24e7e7d00daa1219b14539e2e602649b2 <36230936468f0ba4930e94aef496fc229d4bb951; version=9bb7e0f24e7e7d00daa1219b14539e2e602649b2 <44ea65d779e2d23b2264fea6af2d0c666a3ec9fb; version=9bb7e0f24e7e7d00daa1219b14539e2e602649b2 <58320cb47df2accc7a20bb72c0150280732fa58f; version=9bb7e0f24e7e7d00daa1219b14539e2e602649b2 <922d71fbaf99c1d5318151a0cb0a42ad448d07d9; version=9bb7e0f24e7e7d00daa1219b14539e2e602649b2 <cfbda103aeae61071a122a6fc2bfe98cffbd7165

Published CVSS scores

5.5Oracle LinuxCVSS: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 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

No sourced classifications are available.

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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