CVE-2026-31747: Linux kernel · comedi: me4000: Fix potential overrun of firmware buffer
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 11 Nov 2026, 23:24 UTC
Rated by Threat Radar · No CVSS score from NVD or the CNA
Thin evidence
One scorer or none- EPSS
- 0.1% chance of exploitation in 30 days – higher than 2% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Exploitation evidence
Disclosed: evidence found.
CVE published 1 May 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 11 Nov 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.
References
- git.kernel.org/stable/c/8ddfe6495c245226a30d8b36e2f4a7aa7712e8d6 (opens in a new tab)
- git.kernel.org/stable/c/64b24b713e1a3ea6624480594b4f8c2ff86502f2 (opens in a new tab)
- git.kernel.org/stable/c/f72b5567f7c117b46b4058dc6a0c7554f8565561 (opens in a new tab)
- git.kernel.org/stable/c/1603dd471f47762e9d1f52304edb3e49a7e62655 (opens in a new tab)
- git.kernel.org/stable/c/99f31aa98ab6e3805c455b65bcd01b3d48bdf1a5 (opens in a new tab)
- git.kernel.org/stable/c/eae19cab44204537f79146f15a51811b13227c38 (opens in a new tab)
- git.kernel.org/stable/c/de3f923ae7d91480ed3ecea1b1e1fc0dc25b597d (opens in a new tab)
- git.kernel.org/stable/c/3fb43a7a5b44713f892c58ead2e5f3a1bc9f4ee7 (opens in a new tab)