CVE-2021-47413

/// Technical description

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

usb: chipidea: ci_hdrc_imx: Also search for 'phys' phandle

When passing 'phys' in the devicetree to describe the USB PHY phandle

(which is the recommended way according to

Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt) the

following NULL pointer dereference is observed on i.MX7 and i.MX8MM:

[ 1.489344] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000098

[ 1.498170] Mem abort info:

[ 1.500966] ESR = 0x96000044

[ 1.504030] EC = 0x25: DABT (current EL), IL = 32 bits

[ 1.509356] SET = 0, FnV = 0

[ 1.512416] EA = 0, S1PTW = 0

[ 1.515569] FSC = 0x04: level 0 translation fault

[ 1.520458] Data abort info:

[ 1.523349] ISV = 0, ISS = 0x00000044

[ 1.527196] CM = 0, WnR = 1

[ 1.530176] [0000000000000098] user address but active_mm is swapper

[ 1.536544] Internal error: Oops: 96000044 [#1] PREEMPT SMP

[ 1.542125] Modules linked in:

[

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References