Vulnerability CVE-2024-26659
Published: 2024-04-02

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

xhci: handle isoc Babble and Buffer Overrun events properly

xHCI 4.9 explicitly forbids assuming that the xHC has released its
ownership of a multi-TRB TD when it reports an error on one of the
early TRBs. Yet the driver makes such assumption and releases the TD,
allowing the remaining TRBs to be freed or overwritten by new TDs.

The xHC should also report completion of the final TRB due to its IOC
flag being set by us, regardless of prior errors. This event cannot
be recognized if the TD has already been freed earlier, resulting in
"Transfer event TRB DMA ptr not part of current TD" error message.

Fix this by reusing the logic for processing isoc Transaction Errors.
This also handles hosts which fail to report the final completion.

Fix transfer length reporting on Babble errors. They may be caused by
device malfunction, no guarantee that the buffer has been filled.

 References:
https://git.kernel.org/stable/c/696e4112e5c1ee61996198f0ebb6ca3fab55166e
https://git.kernel.org/stable/c/2aa7bcfdbb46241c701811bbc0d64d7884e3346c
https://git.kernel.org/stable/c/2e3ec80ea7ba58bbb210e83b5a0afefee7c171d3
https://git.kernel.org/stable/c/f5e7ffa9269a448a720e21f1ed1384d118298c97
https://git.kernel.org/stable/c/418456c0ce56209610523f21734c5612ee634134
https://git.kernel.org/stable/c/7c4650ded49e5b88929ecbbb631efb8b0838e811
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