CVE-2026-98702Public exploitHinoki check available

Kernel panic via invalid CSA bandwidth

Published Oct 18, 2026 · Updated Oct 18, 2026

CSA validation in Linux mac80211 allows remote attackers within Wi-Fi range to crash the kernel via crafted channel-switch frames. In net/mac80211/spectmgmt.c, validate_chandef_by_ht_vht_oper() warns on a 320 MHz indication for a non-6 GHz link but continues with an uninitialized vht_oper.chan_width that ieee80211_chandef_vht_oper() reads. The panic requires panic_on_warn enabled and a station associated with the relevant wireless network; no local login is required.

CVSS severityUnavailable
Unscored
EPSS probability0.17%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

CSA validation in Linux mac80211 allows remote attackers within Wi-Fi range to crash the kernel via crafted channel-switch frames. In net/mac80211/spectmgmt.c, validate_chandef_by_ht_vht_oper() warns on a 320 MHz indication for a non-6 GHz link but continues with an uninitialized vht_oper.chan_width that ieee80211_chandef_vht_oper() reads. The panic requires panic_on_warn enabled and a station associated with the relevant wireless network; no local login is required.

The record

CVE
CVE-2026-98702
Published
Oct 18, 2026
Updated
Oct 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 18, 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=21c3f8f95554feff9bed15703e89adbe582e0383 <1892e71aa2e5ee667d87c6e49e3661f5e290303b
  2. Affected versionversion=21c3f8f95554feff9bed15703e89adbe582e0383 <56e236759f0a8dc910c2ae7cd3c161f298ee5794
  3. Affected versionversion=21c3f8f95554feff9bed15703e89adbe582e0383 <79b3ce0d881cd6e5d4d3496b19f5cc5e7089a56c
  4. Affected versionversion=21c3f8f95554feff9bed15703e89adbe582e0383 <cf0ddacce173890407ed3fa50c8ea9b3c0cc0e16
  5. Affected versionversion=6.9

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=21c3f8f95554feff9bed15703e89adbe582e0383 <1892e71aa2e5ee667d87c6e49e3661f5e290303b; version=21c3f8f95554feff9bed15703e89adbe582e0383 <56e236759f0a8dc910c2ae7cd3c161f298ee5794; version=21c3f8f95554feff9bed15703e89adbe582e0383 <79b3ce0d881cd6e5d4d3496b19f5cc5e7089a56c; version=21c3f8f95554feff9bed15703e89adbe582e0383 <cf0ddacce173890407ed3fa50c8ea9b3c0cc0e16; version=6.9

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.

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No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1499Endpoint Denial of Service

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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