CVE-2026-90019 - Vulnerability Details

- usb: gadget: fix null pointer dereference in usb_put_function_instance()

Description

In the Linux kernel, the following vulnerability has been resolved:

usb: gadget: fix null pointer dereference in usb_put_function_instance()

usb_put_function_instance() attempts to dereference fd inside fi struct
to get mod in uvc_alloc_inst() error path. However, fd is not allocated
until later in try_get_usb_function_instance() after allocating fi in
uvc_alloc_inst() and thus guranteed to be null in error path. Fix this
by adding a null check for fi->fd that returns if fd is null.

Published: 2026-09-16

Score: n/a

EPSS: < 1% Very Low

KEV: No

Impact:

Action:

Analysis

Impact

The Linux kernel contains a null pointer dereference in usb_put_function_instance() used by the USB gadget subsystem; when an error path in uvc_alloc_inst() attempts to access fi->fd before it has been allocated, the kernel crashes. This results in a denial of service when the gadget subsystem is loaded.

Affected Systems

All Linux kernel implementations that include the gadget subsystem and do not contain the commit adding a null check for fi->fd are affected; distributions shipping those kernel versions remain vulnerable until upgraded to releases that incorporate the fix.

Risk and Exploitability

Based on the description, the likely attack vector would involve a malicious USB device that triggers the gadget subsystem's error path to create the null pointer dereference; the EPSS score of less than 1% suggests exploitation probability is low. The vulnerability is not listed in the CISA KEV catalog, and no CVSS score is provided in the data.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Linux

unaffected

Version	Status	Constraints
`0062f6e56f70bd2230ba1ebd1667d1b32a1af3b2`	affected	< 0fc54a00954f9f4c3e3d4ffa64a530685d99a39b
`0062f6e56f70bd2230ba1ebd1667d1b32a1af3b2`	affected	< 6e6736c049683380f5e20becde498986e9293ca4
`0062f6e56f70bd2230ba1ebd1667d1b32a1af3b2`	affected	< 3a9691fff79bcce95338435599df6d3ae433cfdc
`0062f6e56f70bd2230ba1ebd1667d1b32a1af3b2`	affected	< 7a4f4ca7ff32ae24807c83e2a06d62b13378d53c
`0062f6e56f70bd2230ba1ebd1667d1b32a1af3b2`	affected	< 6ea3a073ca97716d4a73df49a3bec1c3ccf8e2a0
`0062f6e56f70bd2230ba1ebd1667d1b32a1af3b2`	affected	< d3a7fa61997db3bf6dadef4c1bd87a4fa782a817
`0062f6e56f70bd2230ba1ebd1667d1b32a1af3b2`	affected	< 5117f236e9e30744338b425395d55913c4500897
`0062f6e56f70bd2230ba1ebd1667d1b32a1af3b2`	affected	< 6e74ac5c596fd246e37eadfc354567179ccbe9aa

Linux

affected

Version	Status	Constraints
`3.9`	affected	—
`0`	unaffected	< 3.9
`5.10.270`	unaffected	≤ 5.10.*
`5.15.221`	unaffected	≤ 5.15.*
`6.1.188`	unaffected	≤ 6.1.*
`6.6.157`	unaffected	≤ 6.6.*
`6.12.110`	unaffected	≤ 6.12.*
`6.18.51`	unaffected	≤ 6.18.*
`7.2.5`	unaffected	≤ 7.2.*
`7.3-rc2`	unaffected	≤ *

No data.

Vendor Product Confidence Versions

Linux

Linux Kernel

99%

Version	Status	Scheme	Platform
`[0062f6e56f70bd2230ba1ebd1667d1b32a1af3b2,0fc54a00954f9f4c3e3d4ffa64a530685d99a39b)`	affected	code_commit	—
`[0062f6e56f70bd2230ba1ebd1667d1b32a1af3b2,6e6736c049683380f5e20becde498986e9293ca4)`	affected	code_commit	—
`[0062f6e56f70bd2230ba1ebd1667d1b32a1af3b2,3a9691fff79bcce95338435599df6d3ae433cfdc)`	affected	code_commit	—
`[0062f6e56f70bd2230ba1ebd1667d1b32a1af3b2,7a4f4ca7ff32ae24807c83e2a06d62b13378d53c)`	affected	code_commit	—
`[0062f6e56f70bd2230ba1ebd1667d1b32a1af3b2,6ea3a073ca97716d4a73df49a3bec1c3ccf8e2a0)`	affected	code_commit	—
`[0062f6e56f70bd2230ba1ebd1667d1b32a1af3b2,d3a7fa61997db3bf6dadef4c1bd87a4fa782a817)`	affected	code_commit	—
`[0062f6e56f70bd2230ba1ebd1667d1b32a1af3b2,5117f236e9e30744338b425395d55913c4500897)`	affected	code_commit	—
`[0062f6e56f70bd2230ba1ebd1667d1b32a1af3b2,6e74ac5c596fd246e37eadfc354567179ccbe9aa)`	affected	code_commit	—

Linux

Linux Kernel

99%

Version	Status	Scheme	Platform
`3.9`	affected	generic	—
`[0,3.9)`	unaffected	generic	—
`[5.10.270,5.11.0]`	unaffected	semver	—
`[5.15.221,5.16.0]`	unaffected	semver	—
`[6.1.188,6.2.0]`	unaffected	semver	—
`[6.6.157,6.7.0]`	unaffected	semver	—
`[6.12.110,6.13.0]`	unaffected	semver	—
`[6.18.51,6.19.0]`	unaffected	semver	—
`[7.2.5,7.3.0]`	unaffected	semver	—
`[7.3-rc2,*]`	unaffected	generic	—

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Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

Apply an updated Linux kernel release that incorporates the null check for usb_put_function_instance()
If a kernel upgrade is not feasible, backport or apply the commit that introduces the null check to the current kernel source
Disable or restrict USB gadget functionality on systems that cannot be promptly updated

Generated by OpenCVE AI on September 18, 2026 at 03:53 UTC.

Tracking

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Advisories

Source	ID	Title
Debian DLA	DLA-4817-1	linux-6.12 security update
Debian DSA	DSA-6528-1	linux security update

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.0021.

Key SSVC decision points have not yet been added.

References

Link	Providers
https://git.kernel.org/stable/c/0fc54a00954f9f4c3e3d4ffa64a530685d99a39b
https://git.kernel.org/stable/c/3a9691fff79bcce95338435599df6d3ae433cfdc
https://git.kernel.org/stable/c/5117f236e9e30744338b425395d55913c4500897
https://git.kernel.org/stable/c/6e6736c049683380f5e20becde498986e9293ca4
https://git.kernel.org/stable/c/6e74ac5c596fd246e37eadfc354567179ccbe9aa
https://git.kernel.org/stable/c/6ea3a073ca97716d4a73df49a3bec1c3ccf8e2a0
https://git.kernel.org/stable/c/7a4f4ca7ff32ae24807c83e2a06d62b13378d53c
https://git.kernel.org/stable/c/d3a7fa61997db3bf6dadef4c1bd87a4fa782a817

History

Fri, 18 Sep 2026 04:15:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-476

Wed, 16 Sep 2026 10:45:00 +0000

Type	Values Removed	Values Added
Description		In the Linux kernel, the following vulnerability has been resolved: usb: gadget: fix null pointer dereference in usb_put_function_instance() usb_put_function_instance() attempts to dereference fd inside fi struct to get mod in uvc_alloc_inst() error path. However, fd is not allocated until later in try_get_usb_function_instance() after allocating fi in uvc_alloc_inst() and thus guranteed to be null in error path. Fix this by adding a null check for fi->fd that returns if fd is null.
Title		usb: gadget: fix null pointer dereference in usb_put_function_instance()
First Time appeared		Linux Linux linux Kernel
CPEs		cpe:2.3:o:linux:linux_kernel::::::::
Vendors & Products		Linux Linux linux Kernel
References		https://git.kernel.org/stable/c/0fc54a00954f9f4c3e3d4ffa64a530685d99a39b https://git.kernel.org/stable/c/3a9691fff79bcce95338435599df6d3ae433cfdc https://git.kernel.org/stable/c/5117f236e9e30744338b425395d55913c4500897 https://git.kernel.org/stable/c/6e6736c049683380f5e20becde498986e9293ca4 https://git.kernel.org/stable/c/6e74ac5c596fd246e37eadfc354567179ccbe9aa https://git.kernel.org/stable/c/6ea3a073ca97716d4a73df49a3bec1c3ccf8e2a0 https://git.kernel.org/stable/c/7a4f4ca7ff32ae24807c83e2a06d62b13378d53c https://git.kernel.org/stable/c/d3a7fa61997db3bf6dadef4c1bd87a4fa782a817

Subscriptions

Linux Linux Kernel

MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2026-09-16T10:33:24.173Z

Updated: 2026-09-16T10:33:24.173Z

Reserved: 2026-09-11T19:38:34.781Z

Link: CVE-2026-90019

Vulnrichment

No data.

NVD

Status : Received

Published: 2026-09-16T11:17:14.780

Modified: 2026-09-16T11:17:14.780

Link: CVE-2026-90019

Redhat

No data.

OpenCVE Enrichment

Updated: 2026-09-18T04:00:03Z

Weaknesses

CWE-476
NULL Pointer Dereference

Impact

Affected Systems

Risk and Exploitability

Tracking

Subscriptions

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