Vulnerability CVE-2023-52445
Published: 2024-02-22

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.

 References:
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
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