CVE-2026-64491

Kernel crash via disconnect-time work rearming

Published Jul 25, 2026 · Updated Jul 25, 2026

Use-after-free in the ALSA us144mkii driver in Linux Kernel allows attackers to crash the kernel during USB disconnect. A completion callback can re-arm canceled capture or MIDI-in work after tascam_disconnect() starts freeing the card-private tascam structure. The race requires a URB to complete after work cancellation but before anchored URBs are killed; the public record does not specify attacker privileges.

CVSS severityUnavailable
Unscored
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the ALSA us144mkii driver in Linux Kernel allows attackers to crash the kernel during USB disconnect. A completion callback can re-arm canceled capture or MIDI-in work after tascam_disconnect() starts freeing the card-private tascam structure. The race requires a URB to complete after work cancellation but before anchored URBs are killed; the public record does not specify attacker privileges.

The record

CVE
CVE-2026-64491
Published
Jul 25, 2026
Updated
Jul 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Jul 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 25, 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=6.18
  2. Affected versionversion=c1bb0c13e430623c26543baae5bb9ae21139db87 <147996e7e7c9e8339c0e04f6fa7ccb3e4d448ff7
  3. Affected versionversion=c1bb0c13e430623c26543baae5bb9ae21139db87 <27161c68d5e78807c9d897db222a775b298d05fd
  4. Affected versionversion=c1bb0c13e430623c26543baae5bb9ae21139db87 <c071df05bcda0e47aac581d4b564b2bebcb1ff60

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.18; version=c1bb0c13e430623c26543baae5bb9ae21139db87 <147996e7e7c9e8339c0e04f6fa7ccb3e4d448ff7; version=c1bb0c13e430623c26543baae5bb9ae21139db87 <27161c68d5e78807c9d897db222a775b298d05fd; version=c1bb0c13e430623c26543baae5bb9ae21139db87 <c071df05bcda0e47aac581d4b564b2bebcb1ff60

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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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