CVE-2021-46973 Information

Description

In the Linux kernel the following vulnerability has been resolved:

net: qrtr: Avoid potential use after free in MHI send

It is possible that the MHI ul_callback will be invoked immediately following the queueing of the skb for transmission leading to the callback decrementing the refcount of the associated sk and freeing the skb.

As such the dereference of skb and the increment of the sk refcount must happen before the skb is queued to avoid the skb to be used after free and potentially the sk to drop its last refcount..

Reference

https://git.kernel.org/stable/c/48ec949ac979b4b42d740f67b6177797af834f80 https://git.kernel.org/stable/c/ea474054c2cc6e1284604b21361f475c7cc8c0a0 https://git.kernel.org/stable/c/03c649dee8b1eb5600212a249542a70f47a5ab40 https://git.kernel.org/stable/c/47a017f33943278570c072bc71681809b2567b3a