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

Summary

comedi: me4000: Fix potential overrun of firmware buffer

Original description

The description as published by the source.

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.

Source: OSV.dev (Open Source Vulnerabilities) NVD OSV

Affected packages

Linux Kernel

[{"type":"ECOSYSTEM","events":[{"introduced":"3.19.0"},{"fixed":"5.10.253"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.203"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.168"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.134"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.81"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.22"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"6.19.12"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

BellSoft Alpaquita BELL-CVE-2026-31747 linux-lts Fixed in: 6.1.168-r0
Debian DEBIAN-CVE-2026-31747 linux Fixed in: 5.10.257-1
Ubuntu UBUNTU-CVE-2026-31747 linux-aws

Summary

Original description

Affected packages

Fix status by distribution

References