CVE-2026-74411

System panic via wrapping Wi-Fi scan index

Published Aug 15, 2026 · Updated Aug 15, 2026

Denial of service in Linux kernel 6.4 and later allows attackers to trigger a system panic during 6 GHz Wi-Fi scanning. In rtw89_hw_scan_add_chan_ax, an 8-bit scan index wraps while it is compared with a larger 6 GHz parameter count, so the loop fails to terminate. Reachability requires an rtw89 Wi-Fi device and a 6 GHz scan; the resulting soft lockup stalls a CPU for more than 20 seconds and ends in panic.

CVSS severity8.8
High
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Linux kernel 6.4 and later allows attackers to trigger a system panic during 6 GHz Wi-Fi scanning. In rtw89_hw_scan_add_chan_ax, an 8-bit scan index wraps while it is compared with a larger 6 GHz parameter count, so the loop fails to terminate. Reachability requires an rtw89 Wi-Fi device and a 6 GHz scan; the resulting soft lockup stalls a CPU for more than 20 seconds and ends in panic.

The record

CVE
CVE-2026-74411
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 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=6.4
  2. Affected versionversion=c6aa9a9c47252ac7b07ed6d10459027e2f2a2de0 <05d46e30303275f21f13c951166d39c85df976d4
  3. Affected versionversion=c6aa9a9c47252ac7b07ed6d10459027e2f2a2de0 <08fdcb529df6df3562dd2b0035f88dd5be8b3c68
  4. Affected versionversion=c6aa9a9c47252ac7b07ed6d10459027e2f2a2de0 <140fa699cfd0e18ab2f1497acd951fb3548610f5
  5. Affected versionversion=c6aa9a9c47252ac7b07ed6d10459027e2f2a2de0 <7a1ab5fdcae896e20ca6d68fa0fbd2816cb7471f
  6. Affected versionversion=c6aa9a9c47252ac7b07ed6d10459027e2f2a2de0 <966fbed4b4463fbcb49c5becf3f86eae776861bd

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.4; version=c6aa9a9c47252ac7b07ed6d10459027e2f2a2de0 <05d46e30303275f21f13c951166d39c85df976d4; version=c6aa9a9c47252ac7b07ed6d10459027e2f2a2de0 <08fdcb529df6df3562dd2b0035f88dd5be8b3c68; version=c6aa9a9c47252ac7b07ed6d10459027e2f2a2de0 <140fa699cfd0e18ab2f1497acd951fb3548610f5; version=c6aa9a9c47252ac7b07ed6d10459027e2f2a2de0 <7a1ab5fdcae896e20ca6d68fa0fbd2816cb7471f; version=c6aa9a9c47252ac7b07ed6d10459027e2f2a2de0 <966fbed4b4463fbcb49c5becf3f86eae776861bd

Published CVSS scores

8.8Linux kernel.org CNACVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
5.5Oracle LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6.5Amazon LinuxCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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