CVE-2026-98423Public exploitHinoki check available

Kernel warning via simulated-radio shutdown race

Published Oct 14, 2026 · Updated Oct 14, 2026

A shutdown race in Linux mac80211_hwsim allows local users to trigger a kernel warning through simulated-radio frame delivery. The receive path checks the radio's started flag without synchronizing frame delivery against shutdown, then passes frames from wmediumd to mac80211 after the radio stops. The simulator must be active and frame delivery must overlap shutdown; the documented consequence is WARN_ON(!local->started), with no established service interruption or privilege escalation.

CVSS severityUnavailable
Unscored
EPSS probability0.21%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

A shutdown race in Linux mac80211_hwsim allows local users to trigger a kernel warning through simulated-radio frame delivery. The receive path checks the radio's started flag without synchronizing frame delivery against shutdown, then passes frames from wmediumd to mac80211 after the radio stops. The simulator must be active and frame delivery must overlap shutdown; the documented consequence is WARN_ON(!local->started), with no established service interruption or privilege escalation.

The record

CVE
CVE-2026-98423
Published
Oct 14, 2026
Updated
Oct 14, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 14, 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=3.1
  2. Affected versionversion=7882513bacb176ab4aacceefdd035ca9479da4fb <2f59be7585dc81baa6f36b0035dd6848ea43d318
  3. Affected versionversion=7882513bacb176ab4aacceefdd035ca9479da4fb <5c79ef616aa16af582fb2cb93b0f750975a0004f
  4. Affected versionversion=7882513bacb176ab4aacceefdd035ca9479da4fb <5ce9b2bc9e73213e316a8c72400256a76bf41814
  5. Affected versionversion=7882513bacb176ab4aacceefdd035ca9479da4fb <87840d4a3a21b1c19b867a80e16ba69dff284de2
  6. Affected versionversion=7882513bacb176ab4aacceefdd035ca9479da4fb <c4e4fe330294e3936e0f4e15d6996468f8a45fb2
  7. Affected versionversion=7882513bacb176ab4aacceefdd035ca9479da4fb <d7fa45d8123a7f794b93fc22dbcf19f38dc4d8cb

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=3.1; version=7882513bacb176ab4aacceefdd035ca9479da4fb <2f59be7585dc81baa6f36b0035dd6848ea43d318; version=7882513bacb176ab4aacceefdd035ca9479da4fb <5c79ef616aa16af582fb2cb93b0f750975a0004f; version=7882513bacb176ab4aacceefdd035ca9479da4fb <5ce9b2bc9e73213e316a8c72400256a76bf41814; version=7882513bacb176ab4aacceefdd035ca9479da4fb <87840d4a3a21b1c19b867a80e16ba69dff284de2; version=7882513bacb176ab4aacceefdd035ca9479da4fb <c4e4fe330294e3936e0f4e15d6996468f8a45fb2; version=7882513bacb176ab4aacceefdd035ca9479da4fb <d7fa45d8123a7f794b93fc22dbcf19f38dc4d8cb

Published CVSS scores

No CVSS assessment is available in this record.

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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

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Technologies

Your stack

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Your stack

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