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Change History

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

bus: mhi: ep: Update read pointer only after buffer is written

Inside mhi_ep_ring_add_element, the read pointer (rd_offset) is updated
before the buffer is written, potentially causing race conditions where
the host sees an updated read pointer before the buffer is actually
written. Updating rd_offset prematurely can lead to the host accessing
an uninitialized or incomplete element, resulting in data corruption.

Invoke the buffer write before updating rd_offset to ensure the element
is fully written before signaling its availability.

https://git.kernel.org/stable/c/0007ef098dab48f1ba58364c40b4809f1e21b130

https://git.kernel.org/stable/c/44b9620e82bbec2b9a6ac77f63913636d84f96dc

https://git.kernel.org/stable/c/6f18d174b73d0ceeaa341f46c0986436b3aefc9a

https://git.kernel.org/stable/c/f704a80d9fa268e51a6cc5242714502c3c1fa605