CVE-2026-98006Public exploit

Kernel crash via embedded URB use-after-free

Published Sep 25, 2026 · Updated Sep 25, 2026

Use-after-free in the ALSA caiaq USB-audio driver in affected Linux kernels allows local users to crash the kernel via a crafted USB device. During command-timeout cleanup, snd_card_free() releases the card containing ep1_in_urb and midi_out_urb while dummy_hcd still owns their queued references, so later USB giveback writes through freed storage. Exploitation is local, unprivileged, and peripheral-triggered under the tested dummy_hcd and user-namespace configuration, and the demonstrated consequence is a kernel crash.

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

Use-after-free in the ALSA caiaq USB-audio driver in affected Linux kernels allows local users to crash the kernel via a crafted USB device. During command-timeout cleanup, snd_card_free() releases the card containing ep1_in_urb and midi_out_urb while dummy_hcd still owns their queued references, so later USB giveback writes through freed storage. Exploitation is local, unprivileged, and peripheral-triggered under the tested dummy_hcd and user-namespace configuration, and the demonstrated consequence is a kernel crash.

The record

CVE
CVE-2026-98006
Published
Sep 25, 2026
Updated
Sep 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 25, 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=2.6.22
  2. Affected versionversion=523f1dce37434a9a6623bf46e7893e2b4b10ac3c <0c1b907d5db2f3508375776e5b78d69591aa5626
  3. Affected versionversion=523f1dce37434a9a6623bf46e7893e2b4b10ac3c <402a9d6aab7ac787ab075adeb562c3db8b8f564b
  4. Affected versionversion=523f1dce37434a9a6623bf46e7893e2b4b10ac3c <d41e6c1533f09b27fc562260d41417490d2b6084
  5. Affected versionversion=523f1dce37434a9a6623bf46e7893e2b4b10ac3c <d6dd3c915b0d02457711d8fbaa60efc52144557f

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.22; version=523f1dce37434a9a6623bf46e7893e2b4b10ac3c <0c1b907d5db2f3508375776e5b78d69591aa5626; version=523f1dce37434a9a6623bf46e7893e2b4b10ac3c <402a9d6aab7ac787ab075adeb562c3db8b8f564b; version=523f1dce37434a9a6623bf46e7893e2b4b10ac3c <d41e6c1533f09b27fc562260d41417490d2b6084; version=523f1dce37434a9a6623bf46e7893e2b4b10ac3c <d6dd3c915b0d02457711d8fbaa60efc52144557f

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

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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Your stack

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