CVE-2022-48854 Information

Description

In the Linux kernel the following vulnerability has been resolved:

net: arc_emac: Fix use after free in arc_mdio_probe()

If bus->state is equal to MDIOBUS_ALLOCATED mdiobus_free(bus) will free the us. But bus->name is still used in the next line which will lead to a use after free.

We can fix it by putting the name in a local variable and make the bus->name point to the rodata section ame hen use the name in the error message without referring to bus to avoid the uaf.

Reference

https://git.kernel.org/stable/c/84c831803785c2c3bec5c28c0e8a0b72f6b41d4d https://git.kernel.org/stable/c/bc0e610a6eb0d46e4123fafdbe5e6141d9fff3be