CVE-2025-40172: Linux

High severity, CVSS 7.8. EPSS: 0.1% chance of exploitation in the next 30 days.

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.

Affected products

• Linux Linux: from 6.4.12, before 6.5 (fixed in 6.5); from 6.5, before 6.6.114 (fixed in 6.6.114); from 6.7, before 6.12.55 (fixed in 6.12.55); from 6.13, before 6.17.5 (fixed in 6.17.5)

Published 2025-11-12. Last modified 2026-07-30.