CVE-2026-31747

Summary

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

comedi: me4000: Fix potential overrun of firmware buffer

me4000_xilinx_download() loads the firmware that was requested by request_firmware(). It is possible for it to overrun the source buffer because it blindly trusts the file format. It reads a data stream length from the first 4 bytes into variable file_length and reads the data stream contents of length file_length from offset 16 onwards.

Add a test to ensure that the supplied firmware is long enough to contain the header and the data stream. On failure, log an error and return -EINVAL.

Note: The firmware loading was totally broken before commit ac584af59945 ("staging: comedi: me4000: fix firmware downloading"), but that is the most sensible target for this fix.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/8ddfe6495c245226a30d8b36e2f4a7aa7712e8d6
• https://git.kernel.org/stable/c/64b24b713e1a3ea6624480594b4f8c2ff86502f2
• https://git.kernel.org/stable/c/f72b5567f7c117b46b4058dc6a0c7554f8565561
• https://git.kernel.org/stable/c/1603dd471f47762e9d1f52304edb3e49a7e62655
• https://git.kernel.org/stable/c/99f31aa98ab6e3805c455b65bcd01b3d48bdf1a5
• https://git.kernel.org/stable/c/eae19cab44204537f79146f15a51811b13227c38
• https://git.kernel.org/stable/c/de3f923ae7d91480ed3ecea1b1e1fc0dc25b597d
• https://git.kernel.org/stable/c/3fb43a7a5b44713f892c58ead2e5f3a1bc9f4ee7

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