CVE-2026-90019

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

Published Sep 16, 2026 CVSS n/a EPSS < 1% KEV · Not listed

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.

Affected Products

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`	unaffected	≤ *

No data.

Vendor Product Versions

Linux

Linux Kernel

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

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	—

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

Source	ID	Title
Debian DLA	DLA-4817-1	linux-6.12 security update
Debian DLA	DLA-4841-1	linux security update
Debian DSA	DSA-6528-1	linux security update
Ubuntu USN	USN-8961-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9019-1	Linux kernel (Azure) vulnerabilities
Ubuntu USN	USN-9020-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9022-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9023-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9024-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9025-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9026-1	Linux kernel (Azure) vulnerabilities
Ubuntu USN	USN-9029-1	Linux kernel (Raspberry Pi) vulnerabilities
Ubuntu USN	USN-9039-1	Linux kernel (Azure CVM) vulnerabilities
Ubuntu USN	USN-9040-1	Linux kernel (Low Latency NVIDIA) vulnerabilities
Ubuntu USN	USN-9066-1	Linux kernel (HWE) vulnerabilities
Ubuntu USN	USN-9091-1	Linux kernel (NVIDIA Tegra) vulnerabilities

Metrics

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.216% probability within 30 days)

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

Sep 18, 2026 4:15 AM Weaknesses updated View changes

Type	Values Removed	Values Added
Weaknesses		CWE-476

Sep 16, 2026 10:45 AM Description updated. Title updated. First appearance in the feed. Affected versions updated. Affected vendors updated. Added references View changes

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