CVE-2026-90284

firmware_loader: do not queue completed sysfs fallback requests

Published Sep 17, 2026 CVSS n/a EPSS < 1% KEV · Not listed

Description

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

firmware_loader: do not queue completed sysfs fallback requests

fw_load_sysfs_fallback() calls device_add() before adding the fw_priv to
pending_fw_head. device_add() publishes the fallback loading interface, so
a userspace helper which discovers the device by scanning sysfs can write 0
to the loading attribute and complete the request before it is queued as
pending.

In that interleaving firmware_loading_store() calls fw_state_done() while
pending_list still points to itself, so it cannot remove an entry from
pending_fw_head. The subsequent unconditional list_add() then queues an
already-completed fw_priv. Once the request is released, pending_fw_head
can retain a pointer to freed memory and the next fallback request can
fault while validating the list.

Only in-flight fallback requests need suspend or reboot abort handling. If
the request is already DONE after device_add(), return success from the
fallback path without sending another uevent, waiting again, or queueing it
as pending. This preserves the invariant that pending_fw_head contains only
active fallback requests.

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
`ecb739cf15a9bae040ce6b60209b78b92512d120`	affected	< c8b97c5130f27b64fa2cfe1aa4bebb13f724c6c7
`75d95e2e39b27f733f21e6668af1c9893a97de5e`	affected	< 93a2385730540105df8524447dcc11309ad280f9
`75d95e2e39b27f733f21e6668af1c9893a97de5e`	affected	< ea33fac0df7fe7b49a4b27acb83e227b82317d1d
`75d95e2e39b27f733f21e6668af1c9893a97de5e`	affected	< 5a250bff75a446374c05622973b18b4ab662b504
`75d95e2e39b27f733f21e6668af1c9893a97de5e`	affected	< 85aeb8fc61839098ae0942ccba86e669c08e75d4
`75d95e2e39b27f733f21e6668af1c9893a97de5e`	affected	< 6eaa632d0ed7bbb84f9cb670e5ec4e2cecf4cc7b
`75d95e2e39b27f733f21e6668af1c9893a97de5e`	affected	< fb4824880b0dba0e7b3a497c46c642f979630392
`75d95e2e39b27f733f21e6668af1c9893a97de5e`	affected	< b48373c901951fad1a26bd7c33ad91172b3945b5
`67cf0fbcac0d42d4d4686cddc1e39f465bbfec37`	affected	—
`d09639528b66b5c7c20dc8f7fb8928aacabd40bb`	affected	—
`c14a54675db7131791402fa22fb0fa6da1f5fb66`	affected	—
`5.10.58`	affected	< 5.10.270
`4.19.203`	affected	< 4.20
`5.4.140`	affected	< 5.5
`5.13.10`	affected	< 5.14

Linux

affected

Version	Status	Constraints
`5.14`	affected	—
`0`	unaffected	< 5.14
`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.*
`6.18.52`	unaffected	≤ 6.18.*
`7.2.6`	unaffected	≤ 7.2.*
`7.3`	unaffected	≤ *

No data.

Vendor Product Versions

Linux

Linux Kernel

Version	Status	Scheme	Platform
`[ecb739cf15a9bae040ce6b60209b78b92512d120,c8b97c5130f27b64fa2cfe1aa4bebb13f724c6c7)`	affected	code_commit	—
`[75d95e2e39b27f733f21e6668af1c9893a97de5e,93a2385730540105df8524447dcc11309ad280f9)`	affected	code_commit	—
`[75d95e2e39b27f733f21e6668af1c9893a97de5e,ea33fac0df7fe7b49a4b27acb83e227b82317d1d)`	affected	code_commit	—
`[75d95e2e39b27f733f21e6668af1c9893a97de5e,5a250bff75a446374c05622973b18b4ab662b504)`	affected	code_commit	—
`[75d95e2e39b27f733f21e6668af1c9893a97de5e,85aeb8fc61839098ae0942ccba86e669c08e75d4)`	affected	code_commit	—
`[75d95e2e39b27f733f21e6668af1c9893a97de5e,6eaa632d0ed7bbb84f9cb670e5ec4e2cecf4cc7b)`	affected	code_commit	—
`[75d95e2e39b27f733f21e6668af1c9893a97de5e,fb4824880b0dba0e7b3a497c46c642f979630392)`	affected	code_commit	—
`[75d95e2e39b27f733f21e6668af1c9893a97de5e,b48373c901951fad1a26bd7c33ad91172b3945b5)`	affected	code_commit	—
`67cf0fbcac0d42d4d4686cddc1e39f465bbfec37`	affected	code_commit	—
`d09639528b66b5c7c20dc8f7fb8928aacabd40bb`	affected	code_commit	—
`c14a54675db7131791402fa22fb0fa6da1f5fb66`	affected	code_commit	—
`[5.10.58,5.10.270)`	affected	semver	—
`[4.19.203,4.20.0)`	affected	semver	—
`[5.4.140,5.5.0)`	affected	semver	—
`[5.13.10,5.14.0)`	affected	semver	—

Linux

Linux Kernel

Version	Status	Scheme	Platform
`5.14`	affected	semver	—
`[0,5.14)`	unaffected	semver	—
`[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	—
`[6.18.52,6.19.0)`	unaffected	semver	—
`[7.2.6,7.3.0)`	unaffected	semver	—
`[7.3-rc1,*]`	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/5a250bff75a446374c05622973b18b4ab662b504
https://git.kernel.org/stable/c/6eaa632d0ed7bbb84f9cb670e5ec4e2cecf4cc7b
https://git.kernel.org/stable/c/85aeb8fc61839098ae0942ccba86e669c08e75d4
https://git.kernel.org/stable/c/93a2385730540105df8524447dcc11309ad280f9
https://git.kernel.org/stable/c/b48373c901951fad1a26bd7c33ad91172b3945b5
https://git.kernel.org/stable/c/c8b97c5130f27b64fa2cfe1aa4bebb13f724c6c7
https://git.kernel.org/stable/c/ea33fac0df7fe7b49a4b27acb83e227b82317d1d
https://git.kernel.org/stable/c/fb4824880b0dba0e7b3a497c46c642f979630392

History

Sep 19, 2026 3:00 PM Weaknesses updated View changes

Type	Values Removed	Values Added
Weaknesses		CWE-416

Sep 17, 2026 4:30 PM 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: firmware_loader: do not queue completed sysfs fallback requests fw_load_sysfs_fallback() calls device_add() before adding the fw_priv to pending_fw_head. device_add() publishes the fallback loading interface, so a userspace helper which discovers the device by scanning sysfs can write 0 to the loading attribute and complete the request before it is queued as pending. In that interleaving firmware_loading_store() calls fw_state_done() while pending_list still points to itself, so it cannot remove an entry from pending_fw_head. The subsequent unconditional list_add() then queues an already-completed fw_priv. Once the request is released, pending_fw_head can retain a pointer to freed memory and the next fallback request can fault while validating the list. Only in-flight fallback requests need suspend or reboot abort handling. If the request is already DONE after device_add(), return success from the fallback path without sending another uevent, waiting again, or queueing it as pending. This preserves the invariant that pending_fw_head contains only active fallback requests.
Title		firmware_loader: do not queue completed sysfs fallback requests
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/5a250bff75a446374c05622973b18b4ab662b504 https://git.kernel.org/stable/c/6eaa632d0ed7bbb84f9cb670e5ec4e2cecf4cc7b https://git.kernel.org/stable/c/85aeb8fc61839098ae0942ccba86e669c08e75d4 https://git.kernel.org/stable/c/93a2385730540105df8524447dcc11309ad280f9 https://git.kernel.org/stable/c/b48373c901951fad1a26bd7c33ad91172b3945b5 https://git.kernel.org/stable/c/c8b97c5130f27b64fa2cfe1aa4bebb13f724c6c7 https://git.kernel.org/stable/c/ea33fac0df7fe7b49a4b27acb83e227b82317d1d https://git.kernel.org/stable/c/fb4824880b0dba0e7b3a497c46c642f979630392