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Review reviewHigh

CVE-2025-40172

Linux

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...

CVSS
7.8
EPSS
0.14%
3.84% percentile
CISA KEV
Not listed
Published
2025.11.12
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.14%
Technical severityCVSS 7.8

Vulnerability overview

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...

Affected product and versions

Product
Linux
Affected versions
>= 96d3c1cadedb6ae2e8965e19cd12caa244afbd9c < 48b1d42286bfef7628b1d6c8c28d4e456c90f725, >= 96d3c1cadedb6ae2e8965e19cd12caa244afbd9c < 551f1dfbcb7f3e6ed07f9d6c8c1c64337fcd0ede, >= 96d3c1cadedb6ae2e8965e19cd12caa244afbd9c < 1ab9733d14cc9987cc5dcd1f0ad1f416e302e2e6, >= 96d3c1cadedb6ae2e8965e19cd12caa244afbd9c < 11f08c30a3e4157305ba692f1d44cca5fc9a8fca, >= d410a96e5cb8c1ec7049c83f2edcd8bbfaf5d9b3, >= 6.4.12 < 6.5, >= 6.5
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
Not available