High 7.8Published May 1, 2026

CVE-2026-31747comedi: me4000: Fix potential overrun of firmware buffer

Updated under an hour ago (Oct 27, 2026, 8:25 PM ET)

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Exploited in the last 30 days

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.

CVSS: 7.8 HIGH (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: May 11, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from ac584af599452748187cf6d7865b1607c54ee443 before 8ddfe6495c245226a30d8b36e2f4a7aa7712e8d6; from ac584af599452748187cf6d7865b1607c54ee443 before 64b24b713e1a3ea6624480594b4f8c2ff86502f2; from ac584af599452748187cf6d7865b1607c54ee443 before f72b5567f7c117b46b4058dc6a0c7554f8565561; from ac584af599452748187cf6d7865b1607c54ee443 before 1603dd471f47762e9d1f52304edb3e49a7e62655; from ac584af599452748187cf6d7865b1607c54ee443 before 99f31aa98ab6e3805c455b65bcd01b3d48bdf1a5; from ac584af599452748187cf6d7865b1607c54ee443 before eae19cab44204537f79146f15a51811b13227c38; from ac584af599452748187cf6d7865b1607c54ee443 before de3f923ae7d91480ed3ecea1b1e1fc0dc25b597d; from ac584af599452748187cf6d7865b1607c54ee443 before 3fb43a7a5b44713f892c58ead2e5f3a1bc9f4ee7	CNA record
linux linux_kernel linux:linux_kernel	from 3.19 before 5.10.253; from 5.11 before 5.15.203; from 5.16 before 6.1.168; from 6.2 before 6.6.134; from 6.7 before 6.12.81; from 6.13 before 6.18.22; from 6.19 before 6.19.12; 7.0; and 5 more ranges	NVD

References

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.