CVE-2023-52445 Information

Description

In the Linux kernel the following vulnerability has been resolved:

media: pvrusb2: fix use after free on context disconnection

Upon module load a kthread is created targeting the pvr2_context_thread_func function which may call pvr2_context_destroy and thus call kfree() on the context object. However that might happen before the usb hub_event handler is able to notify the driver. This patch adds a sanity check before the invalid read reported by syzbot within the context disconnection call stack.

Reference

https://git.kernel.org/stable/c/ec36c134dd020d28e312c2f1766f85525e747aab https://git.kernel.org/stable/c/47aa8fcd5e8b5563af4042a00f25ba89bef8f33d https://git.kernel.org/stable/c/3233d8bf7893550045682192cb227af7fa3defeb https://git.kernel.org/stable/c/ec3634ebe23fc3c44ebc67c6d25917300bc68c08 https://git.kernel.org/stable/c/30773ea47d41773f9611ffb4ebc9bda9d19a9e7e https://git.kernel.org/stable/c/2cf0005d315549b8d2b940ff96a66c2a889aa795 https://git.kernel.org/stable/c/437b5f57732bb4cc32cc9f8895d2010ee9ff521c https://git.kernel.org/stable/c/ded85b0c0edd8f45fec88783d7555a5b982449c1