IT

Tracker / CVE-2021-47416

CVE-2021-47416

Medium 5.5

In the Linux kernel, the following vulnerability has been resolved: phy: mdio: fix memory leak Syzbot reported memory leak in MDIO bus interface, the problem was in wrong state logic. MDIOBUS_ALLOCATED indicates 2 states: 1. Bus is only allocated 2. Bus allocated and __mdiobus_register() fails, but device_register() was called In case of device_register() has been called we should call put_device() to correctly free the memory allocated for this device, but mdiobus_free() calls just kfree(dev) in case of MDIOBUS_ALLOCATED state To avoid this behaviour we need to set bus->state to MDIOBUS_UNREGISTERED _before_ calling device_register(), because put_device() should be called even in case of device_register() failure.

Affected products and versions

linux linux_kernel
linux linux_kernel · 2.6.28 → 4.4.289
linux linux_kernel · 4.10 → 4.14.251
linux linux_kernel · 4.15 → 4.19.211
linux linux_kernel · 4.20 → 5.4.153
linux linux_kernel · 4.5 → 4.9.287
linux linux_kernel · 5.11 → 5.14.12
linux linux_kernel · 5.5 → 5.10.73

Analysis

This page is not indexable yet.Until it carries original analysis — what it actually exposes, how to check in two minutes whether a system was touched, what to do if it was — the page stays noindex. The database decides that, not the template.

References