CVE-2026-72391

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

net: phy: sfp: free mii_bus in sfp_i2c_mdiobus_destroy

sfp_i2c_mdiobus_create() allocates the I2C MDIO bus with mdio_i2c_alloc(),

a plain (non-devm) allocation, and registers it. sfp_i2c_mdiobus_destroy()

only unregisters the bus and clears sfp->i2c_mii without calling

mdiobus_free(). As the only reference to the bus is then cleared, the

struct mii_bus is leaked.

This is hit whenever a copper/RollBall SFP module that instantiated an MDIO

bus is removed: sfp_sm_main() takes the global teardown path and calls

sfp_i2c_mdiobus_destroy(). sfp_cleanup(), on driver unbind, frees

sfp->i2c_mii directly, which is why the leak only triggered on module

hot-removal and not on unbind.

Free the bus in sfp_i2c_mdiobus_destroy() to match the allocation done in

sfp_i2c_mdiobus_create().