CVE-2026-90284
UnknownSummary
In the Linux kernel, the firmware_loader has an issue with queueing completed sysfs fallback requests. fw_load_sysfs_fallback() calls device_add() before adding fw_priv to pending_fw_head. This allows a userspace helper to complete the request before it is queued, leading to queueing an already-completed request and potential fault on the next request. The fix checks if the request is already done and does not queue it.
Risk Assessment
This can lead to use-after-free, potentially causing system crash or privilege escalation. An attacker with sysfs access could trigger this bug.
Recommendation
Apply the Linux kernel update containing this fix. Restrict access to the sysfs interface for unauthorized users.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS