firmware_loader: do not queue completed sysfs fallback requests
Key facts
- Attack vector
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- Privileges required
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- User interaction
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- Attack complexity
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- Impact type
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- Confidentiality · integrity · availability
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- Fix status
- Partial Red Hat: 4 without a fix
No CVSS vector from any source. Fix status from CNA and Red Hat.
Summary
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.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 5.10.58 to before 5.10.270; 4.19.203 to before 4.20; 5.4.140 to before 5.5; 5.13.10 to before 5.14 | 5.10.270, 4.20, 5.5, 5.14 | Patch available | CNA |
| Linux | Linux | 5.14 and later | 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110, 6.18.52, 7.2.6, 7.3 | Patch available | CNA |
- Linux VendorLinux Affected 5.10.58 to before 5.10.270; 4.19.203 to before 4.20; 5.4.140 to before 5.5; 5.13.10 to before 5.14 Fixed in 5.10.270, 4.20, 5.5, 5.14 Patch available CNA
- Linux VendorLinux Affected 5.14 and later Fixed in 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110, 6.18.52, 7.2.6, 7.3 Patch available CNA
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.10.270, 4.20, 5.5, 5.14
- Fix · CNA Linux (Linux) Fixed in 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110, 6.18.52, 7.2.6, 7.3
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 8 | Affected | No fix yet |
| Red Hat Enterprise Linux 9 | Affected | No fix yet |
| Red Hat OpenShift Container Platform 4 | Affected | No fix yet |
| Red Hat OpenShift Container Platform 5 | Affected | No fix yet |
Not affected: 4 products
- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat OpenShift Container Platform 4
Timeline
- 2026-10-02 Threatist record created from CVE-2026-90284
- 2026-10-03 Alias added: GHSA-97xh-425q-x269
- 2026-10-15 Affected versions changed · Red Hat
- 2026-10-15 CVSS score added · Red Hat
- 2026-10-19 Fix available: Linux/[email protected] · CNA
- 2026-10-29 CVSS score changed · Red Hat
- 2026-10-30 Affected versions changed · Red Hat
References
Other 8
- https://git.kernel.org/stable/c/c8b97c5130f27b64fa2cfe1aa4bebb13f724c6c7
- https://git.kernel.org/stable/c/93a2385730540105df8524447dcc11309ad280f9
- https://git.kernel.org/stable/c/ea33fac0df7fe7b49a4b27acb83e227b82317d1d
- https://git.kernel.org/stable/c/5a250bff75a446374c05622973b18b4ab662b504
- https://git.kernel.org/stable/c/85aeb8fc61839098ae0942ccba86e669c08e75d4
- https://git.kernel.org/stable/c/6eaa632d0ed7bbb84f9cb670e5ec4e2cecf4cc7b
- https://git.kernel.org/stable/c/fb4824880b0dba0e7b3a497c46c642f979630392
- https://git.kernel.org/stable/c/b48373c901951fad1a26bd7c33ad91172b3945b5
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Sources
- CVE-2026-90284 · CVE Program
- CVE-2026-90284 · NVD
- FIRST EPSS
- GHSA-97xh-425q-x269 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-90284 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences