CVE-2026-31747

Kernel memory overread via malformed firmware length

Published May 1, 2026 · Updated May 1, 2026

Out-of-bounds read in the Linux kernel me4000 Comedi driver allows local users to access memory beyond a malformed firmware buffer. me4000_xilinx_download trusts a length stored in the first four firmware bytes and reads that many bytes from offset 16 without confirming that the source buffer contains them. NVD rates the attack as local with low privileges, but the upstream record establishes no reliable crash, disclosure, or code-execution outcome.

CVSS severity7.8
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in the Linux kernel me4000 Comedi driver allows local users to access memory beyond a malformed firmware buffer. me4000_xilinx_download trusts a length stored in the first four firmware bytes and reads that many bytes from offset 16 without confirming that the source buffer contains them. NVD rates the attack as local with low privileges, but the upstream record establishes no reliable crash, disclosure, or code-execution outcome.

The record

CVE
CVE-2026-31747
Published
May 1, 2026
Updated
May 1, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-787
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 2026CVE publishedPublication date reported by the CVE source.
  2. May 1, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.19
  2. Affected versionversion=ac584af599452748187cf6d7865b1607c54ee443 <1603dd471f47762e9d1f52304edb3e49a7e62655
  3. Affected versionversion=ac584af599452748187cf6d7865b1607c54ee443 <3fb43a7a5b44713f892c58ead2e5f3a1bc9f4ee7
  4. Affected versionversion=ac584af599452748187cf6d7865b1607c54ee443 <64b24b713e1a3ea6624480594b4f8c2ff86502f2
  5. Affected versionversion=ac584af599452748187cf6d7865b1607c54ee443 <8ddfe6495c245226a30d8b36e2f4a7aa7712e8d6
  6. Affected versionversion=ac584af599452748187cf6d7865b1607c54ee443 <99f31aa98ab6e3805c455b65bcd01b3d48bdf1a5
  7. Affected versionversion=ac584af599452748187cf6d7865b1607c54ee443 <de3f923ae7d91480ed3ecea1b1e1fc0dc25b597d
  8. Affected versionversion=ac584af599452748187cf6d7865b1607c54ee443 <eae19cab44204537f79146f15a51811b13227c38
  9. Affected versionversion=ac584af599452748187cf6d7865b1607c54ee443 <f72b5567f7c117b46b4058dc6a0c7554f8565561

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=3.19; version=ac584af599452748187cf6d7865b1607c54ee443 <1603dd471f47762e9d1f52304edb3e49a7e62655; version=ac584af599452748187cf6d7865b1607c54ee443 <3fb43a7a5b44713f892c58ead2e5f3a1bc9f4ee7; version=ac584af599452748187cf6d7865b1607c54ee443 <64b24b713e1a3ea6624480594b4f8c2ff86502f2; version=ac584af599452748187cf6d7865b1607c54ee443 <8ddfe6495c245226a30d8b36e2f4a7aa7712e8d6; version=ac584af599452748187cf6d7865b1607c54ee443 <99f31aa98ab6e3805c455b65bcd01b3d48bdf1a5; version=ac584af599452748187cf6d7865b1607c54ee443 <de3f923ae7d91480ed3ecea1b1e1fc0dc25b597d; version=ac584af599452748187cf6d7865b1607c54ee443 <eae19cab44204537f79146f15a51811b13227c38; version=ac584af599452748187cf6d7865b1607c54ee443 <f72b5567f7c117b46b4058dc6a0c7554f8565561

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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