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

net: mdiobus: fix unbalanced node reference count

I got the following report while doing device(mscc-miim) load test
with CONFIG_OF_UNITTEST and CONFIG_OF_DYNAMIC enabled:

OF: ERROR: memory leak, expected refcount 1 instead of 2,
of_node_get()/of_node_put() unbalanced - destroy cset entry:
attach overlay node /spi/soc@0/mdio@7107009c/ethernet-phy@0

If the 'fwnode' is not an acpi node, the refcount is get in
fwnode_mdiobus_phy_device_register(), but it has never been
put when the device is freed in the normal path. So call
fwnode_handle_put() in phy_device_release() to avoid leak.

If it's an acpi node, it has never been get, but it's put
in the error path, so call fwnode_handle_get() before
phy_device_register() to keep get/put operation balanced.

References

• https://nvd.nist.gov/vuln/detail/CVE-2022-49016
• https://git.kernel.org/stable/c/2708b357440427d6a9fee667eb7b8307f4625adc
• https://git.kernel.org/stable/c/543d917f691ab06885ee779c862065899eaa4251
• https://git.kernel.org/stable/c/cdde1560118f82498fc9e9a7c1ef7f0ef7755891