Linux Kernel up to 7.3-rc2 6fire usb6fire_comm_free packets/iso_frame_desc use after free

CVSS Meta Temp Score
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CTI Interest Score
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7.8$0-$5k0.35+

Summaryinfo

A vulnerability was found in Linux Kernel up to 7.3-rc2 and classified as very critical. Impacted is the function usb6fire_comm_free of the component 6fire. Such manipulation of the argument packets/iso_frame_desc leads to use after free. This vulnerability is traded as CVE-2026-98428. An attack has to be approached locally. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 7.3-rc2 and classified as very critical. Affected by this issue is the function usb6fire_comm_free of the component 6fire. The manipulation of the argument packets/iso_frame_desc with an unknown input leads to a use after free vulnerability. Using CWE to declare the problem leads to CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. Impacted is confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: ALSA: usb: 6fire: Avoid embedded URBs The USB 6fire driver uses URBs embedded in different structs for PCM, MIDI and communication, and this is basically a buggy implementation nowadays; since a URB is managed with a refcount, this may lead to a UAF when the URB is released asynchronously. For addressing the problem, this patch converts those embedded URBs to ones that are properly allocated via usb_alloc_urb(). The pcm_urb.packets[] is gone, as it's allocated by usb_alloc_urb(), hence it's found in urb.iso_frame_desc[] instead. The conversions are rather straightforward; each embedded struct urb is changed to a pointer, and its callers are updated accordingly. The resource for those structs are released in the common destructor functions (usb6fire_comm_free(), etc), which are called at both the init error path and the disconnect. No functional changes, only compile-tested.

The advisory is shared for download at git.kernel.org. This vulnerability is handled as CVE-2026-98428 since 09/25/2026. The exploitation is known to be easy. The attack needs to be approached locally. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 10/14/2026).

Upgrading to version 6.1.189, 6.6.158, 6.12.112, 6.18.54, 7.2.8 or 7.3-rc3 eliminates this vulnerability. Applying the patch 3ef9093d83ffecb8e5f6c9d5769a52d39df74f7a/8b8559aeaba2e51cfee1779b2383b085991f7d81/52a43c2d57e774489ac3fbbac06ff02f19bd9a52/999f433c09e4668412bd68ca207ae2b4af863862/d181434549b3da668110a25d743848cce9897f4e/9fe49dbc023e82dfaee7b245997d820d01742a9a is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

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Version

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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
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 6.1.189/6.6.158/6.12.112/6.18.54/7.2.8/7.3-rc3
Patch: 3ef9093d83ffecb8e5f6c9d5769a52d39df74f7a/8b8559aeaba2e51cfee1779b2383b085991f7d81/52a43c2d57e774489ac3fbbac06ff02f19bd9a52/999f433c09e4668412bd68ca207ae2b4af863862/d181434549b3da668110a25d743848cce9897f4e/9fe49dbc023e82dfaee7b245997d820d01742a9a

Timelineinfo

09/25/2026 CVE reserved
10/14/2026 +19 days Advisory disclosed
10/14/2026 +0 days VulDB entry created
10/14/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-98428 (🔒)
GCVE (CVE): GCVE-0-2026-98428
GCVE (VulDB): GCVE-100-419864

Entryinfo

Created: 10/14/2026 16:05
Changes: 10/14/2026 16:05 (60)
Complete: 🔍
Cache ID: 216::103

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