Linux Kernel up to 6.18.38/7.1.3/7.2-rc1 ALSA usx2y tascam_disconnect use after free

CVSS Meta Temp Score
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CTI Interest Score
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7.8$0-$5k3.17

Summaryinfo

A vulnerability has been found in Linux Kernel up to 6.18.38/7.1.3/7.2-rc1 and classified as very critical. This affects the function tascam_disconnect of the component ALSA usx2y. This manipulation causes use after free. This vulnerability is handled as CVE-2026-64491. It is possible to launch the attack on the local host. There is not any exploit available.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.18.38/7.1.3/7.2-rc1. It has been declared as very critical. Affected by this vulnerability is the function tascam_disconnect of the component ALSA usx2y. The manipulation with an unknown input leads to a use after free vulnerability. The CWE definition for the vulnerability is CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: ALSA: usx2y: us144mkii: fix work UAF on disconnect tascam_disconnect() cancels capture_work and midi_in_work before usb_kill_anchored_urbs() kills the capture/MIDI-in URBs. Those URBs self-resubmit, and their completion handlers reschedule the work. A URB that completes in the small window between cancel_work_sync() and usb_kill_anchored_urbs() therefore re-arms the work after its only cancel. Nothing cancels it again before snd_card_free() frees the card-private tascam structure, so the work handler then runs on freed memory. Kill the anchored URBs before cancelling the work; once the work is cancelled no remaining URB can complete to re-arm it.

The advisory is shared at git.kernel.org. This vulnerability is known as CVE-2026-64491 since 07/19/2026. The exploitation appears to be easy. An attack has to be approached locally. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 07/26/2026).

Upgrading to version 6.18.39, 7.1.4 or 7.2-rc2 eliminates this vulnerability. Applying the patch c071df05bcda0e47aac581d4b564b2bebcb1ff60/27161c68d5e78807c9d897db222a775b298d05fd/147996e7e7c9e8339c0e04f6fa7ccb3e4d448ff7 is able to eliminate this problem.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-48835). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.2
VulDB Meta Temp Score: 7.8

VulDB Base Score: 8.2
VulDB Temp Score: 7.8
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.18.39/7.1.4/7.2-rc2
Patch: c071df05bcda0e47aac581d4b564b2bebcb1ff60/27161c68d5e78807c9d897db222a775b298d05fd/147996e7e7c9e8339c0e04f6fa7ccb3e4d448ff7

Timelineinfo

07/19/2026 CVE reserved
07/25/2026 +6 days Advisory disclosed
07/25/2026 +0 days VulDB entry created
07/26/2026 +1 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-64491 (🔒)
GCVE (CVE): GCVE-0-2026-64491
GCVE (VulDB): GCVE-100-383281
EUVD: 🔒

Entryinfo

Created: 07/25/2026 19:11
Updated: 07/26/2026 05:19
Changes: 07/25/2026 19:11 (59), 07/26/2026 05:19 (1)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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