CVE-2026-98329Public exploit

Kernel warning via unchecked radiotap bandwidth

Published Oct 6, 2026 · Updated Oct 6, 2026

Improper bandwidth validation in Linux mac80211 allows local users to trigger a kernel warning via monitor-mode frame injection. The radiotap transmit parser passes a requested frame bandwidth to the driver without checking it against the operating channel width, triggering a warning in mac80211_hwsim when the request is too wide. The trigger requires local monitor-interface packet injection; the warning becomes a kernel panic only when panic-on-warning behavior is enabled.

CVSS severityUnavailable
Unscored
EPSS probability0.18%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper bandwidth validation in Linux mac80211 allows local users to trigger a kernel warning via monitor-mode frame injection. The radiotap transmit parser passes a requested frame bandwidth to the driver without checking it against the operating channel width, triggering a warning in mac80211_hwsim when the request is too wide. The trigger requires local monitor-interface packet injection; the warning becomes a kernel panic only when panic-on-warning behavior is enabled.

The record

CVE
CVE-2026-98329
Published
Oct 6, 2026
Updated
Oct 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 6, 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=4.7
  2. Affected versionversion=646e76bb5daf4ca38438c69ffb72cccb605f3466 <73f48f7e16cadfc74f444ccd10c1d3ae253e2e27
  3. Affected versionversion=646e76bb5daf4ca38438c69ffb72cccb605f3466 <a5c715eda066cba5ce3372759188ba8636dca629
  4. Affected versionversion=646e76bb5daf4ca38438c69ffb72cccb605f3466 <c69718519a81e87284494d0c6e6eb7bdd834707a
  5. Affected versionversion=646e76bb5daf4ca38438c69ffb72cccb605f3466 <e14bf37bb2b3853012ff160131d1c6233f7a9cc9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=4.7; version=646e76bb5daf4ca38438c69ffb72cccb605f3466 <73f48f7e16cadfc74f444ccd10c1d3ae253e2e27; version=646e76bb5daf4ca38438c69ffb72cccb605f3466 <a5c715eda066cba5ce3372759188ba8636dca629; version=646e76bb5daf4ca38438c69ffb72cccb605f3466 <c69718519a81e87284494d0c6e6eb7bdd834707a; version=646e76bb5daf4ca38438c69ffb72cccb605f3466 <e14bf37bb2b3853012ff160131d1c6233f7a9cc9

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

T1499.004Application or System Exploitation

Public exploit references

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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