CVE-2026-64376

Summary

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

firmware_loader: fix device reference leak in firmware_upload_register()

firmware_upload_register() -> fw_create_instance() -> device_initialize()

After fw_create_instance() succeeds, the lifetime of the embedded struct device is expected to be managed through the device core reference counting, since fw_create_instance() has already called device_initialize().

In firmware_upload_register(), if alloc_lookup_fw_priv() fails after fw_create_instance() succeeds, the code reaches free_fw_sysfs and frees fw_sysfs directly instead of releasing the device reference with put_device(). This may leave the reference count of the embedded struct device unbalanced, resulting in a refcount leak.

The issue was identified by a static analysis tool I developed and confirmed by manual review. Fix this by using put_device(fw_dev) in the failure path and letting fw_dev_release() handle the final cleanup, instead of freeing the instance directly from the error path.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/517676ec7dfca064e08f94007a4abd21969de0a0
• https://git.kernel.org/stable/c/46d403da376a8b7c1187193294953816e1a8d7fe
• https://git.kernel.org/stable/c/2619b47a0c8114eef980a56ade7e3ef4b58eb384
• https://git.kernel.org/stable/c/92f41769e5fd16bcd9ba97500d0517332e0a5b45
• https://git.kernel.org/stable/c/15432f19562fdb9199cce6d9fc24db12c71ed574
• https://git.kernel.org/stable/c/896df22ee57648b0c505bd76ddbc6b2341834696

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