CVE-2026-31747

comedi: me4000: Fix potential overrun of firmware buffer

State: Published
Severity: Not scored
Published: May 1, 2026
Updated: May 11, 2026
Reserved: Mar 9, 2026

Description

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	ac584af599452748187cf6d7865b1607c54ee443 to before 8ddfe6495c245226a30d8b36e2f4a7aa7712e8d6Affected ac584af599452748187cf6d7865b1607c54ee443 to before 64b24b713e1a3ea6624480594b4f8c2ff86502f2Affected ac584af599452748187cf6d7865b1607c54ee443 to before f72b5567f7c117b46b4058dc6a0c7554f8565561Affected ac584af599452748187cf6d7865b1607c54ee443 to before 1603dd471f47762e9d1f52304edb3e49a7e62655Affected ac584af599452748187cf6d7865b1607c54ee443 to before 99f31aa98ab6e3805c455b65bcd01b3d48bdf1a5Affected ac584af599452748187cf6d7865b1607c54ee443 to before eae19cab44204537f79146f15a51811b13227c38Affected ac584af599452748187cf6d7865b1607c54ee443 to before de3f923ae7d91480ed3ecea1b1e1fc0dc25b597dAffected ac584af599452748187cf6d7865b1607c54ee443 to before 3fb43a7a5b44713f892c58ead2e5f3a1bc9f4ee7Affected
LinuxLinux	3.19Affected before 3.19Not affected 5.10.253 through 5.10.Not affected 5.15.203 through 5.15.Not affected 6.1.168 through 6.1.Not affected 6.6.134 through 6.6.Not affected 6.12.81 through 6.12.Not affected 6.18.22 through 6.18.Not affected 6.19.12 through 6.19.*Not affected 7.0 and laterNot affected

Product

Versions

LinuxLinux

ac584af599452748187cf6d7865b1607c54ee443 to before 8ddfe6495c245226a30d8b36e2f4a7aa7712e8d6Affected
ac584af599452748187cf6d7865b1607c54ee443 to before 64b24b713e1a3ea6624480594b4f8c2ff86502f2Affected
ac584af599452748187cf6d7865b1607c54ee443 to before f72b5567f7c117b46b4058dc6a0c7554f8565561Affected
ac584af599452748187cf6d7865b1607c54ee443 to before 1603dd471f47762e9d1f52304edb3e49a7e62655Affected
ac584af599452748187cf6d7865b1607c54ee443 to before 99f31aa98ab6e3805c455b65bcd01b3d48bdf1a5Affected
ac584af599452748187cf6d7865b1607c54ee443 to before eae19cab44204537f79146f15a51811b13227c38Affected
ac584af599452748187cf6d7865b1607c54ee443 to before de3f923ae7d91480ed3ecea1b1e1fc0dc25b597dAffected
ac584af599452748187cf6d7865b1607c54ee443 to before 3fb43a7a5b44713f892c58ead2e5f3a1bc9f4ee7Affected

LinuxLinux

3.19Affected
before 3.19Not affected
5.10.253 through 5.10.*Not affected
5.15.203 through 5.15.*Not affected
6.1.168 through 6.1.*Not affected
6.6.134 through 6.6.*Not affected
6.12.81 through 6.12.*Not affected
6.18.22 through 6.18.*Not affected
6.19.12 through 6.19.*Not affected
7.0 and laterNot affected

References

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