CVE-2022-48805

/// Technical description

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

net: usb: ax88179_178a: Fix out-of-bounds accesses in RX fixup

ax88179_rx_fixup() contains several out-of-bounds accesses that can be

triggered by a malicious (or defective) USB device, in particular:

- The metadata array (hdr_off..hdr_off+2*pkt_cnt) can be out of bounds,

causing OOB reads and (on big-endian systems) OOB endianness flips.

- A packet can overlap the metadata array, causing a later OOB

endianness flip to corrupt data used by a cloned SKB that has already

been handed off into the network stack.

- A packet SKB can be constructed whose tail is far beyond its end,

causing out-of-bounds heap data to be considered part of the SKB's

data.

I have tested that this can be used by a malicious USB device to send a

bogus ICMPv6 Echo Request and receive an ICMPv6 Echo Reply in response

that contains random kernel heap data.

It's probably also possible to get OOB writes from this on a

little-endia

/// 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