Bug 2414513 (CVE-2025-40172)

Summary: CVE-2025-40172 kernel: accel/qaic: Treat remaining == 0 as error in find_and_map_user_pages()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
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OS: Linux   
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Description OSIDB Bzimport 2025-11-12 11:04:46 UTC 
In the Linux kernel, the following vulnerability has been resolved:

accel/qaic: Treat remaining == 0 as error in find_and_map_user_pages()

Currently, if find_and_map_user_pages() takes a DMA xfer request from the
user with a length field set to 0, or in a rare case, the host receives
QAIC_TRANS_DMA_XFER_CONT from the device where resources->xferred_dma_size
is equal to the requested transaction size, the function will return 0
before allocating an sgt or setting the fields of the dma_xfer struct.
In that case, encode_addr_size_pairs() will try to access the sgt which
will lead to a general protection fault.

Return an EINVAL in case the user provides a zero-sized ALP, or the device
requests continuation after all of the bytes have been transferred.
Comment 1 Alexander B 2025-11-13 13:23:37 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025111254-CVE-2025-40172-f3b8@gregkh/T