CVE-2026-64376
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,…
Does this matter?
Lower severity and a low EPSS score (0.12%). Track it; it rarely justifies an emergency change on its own.
Description
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.
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.12% probability · 2th percentile
- CISA KEV
- Not listed
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/15432f19562fdb9199cce6d9fc24db12c71ed574Patch
- https://git.kernel.org/stable/c/2619b47a0c8114eef980a56ade7e3ef4b58eb384Patch
- https://git.kernel.org/stable/c/46d403da376a8b7c1187193294953816e1a8d7fePatch
- https://git.kernel.org/stable/c/517676ec7dfca064e08f94007a4abd21969de0a0Patch
- https://git.kernel.org/stable/c/896df22ee57648b0c505bd76ddbc6b2341834696Patch
- https://git.kernel.org/stable/c/92f41769e5fd16bcd9ba97500d0517332e0a5b45Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.