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NVD / CVE Program· CNA Linux

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

Noroxi assessment

Priority: Monitor (action score 31/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.12% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 1603dd471f47762e9d1f52304edb3e49a7e62655, 3fb43a7a5b44713f892c58ead2e5f3a1bc9f4ee7, 64b24b713e1a3ea6624480594b4f8c2ff86502f2.

Low priority for now. Upgrade to Linux Linux 1603dd471f47762e9d1f52304edb3e49a7e62655, 3fb43a7a5b44713f892c58ead2e5f3a1bc9f4ee7, 64b24b713e1a3ea6624480594b4f8c2ff86502f2 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
May 1, 2026
Updated
Jun 17, 2026
EPSS
0.1% · 2th percentile

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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When you'll hear from us

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  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel3.19 and later · before 5.10.253
  • linux linux kernel5.11 and later · before 5.15.203
  • linux linux kernel5.16 and later · before 6.1.168
  • linux linux kernel6.2 and later · before 6.6.134
  • linux linux kernel6.7 and later · before 6.12.81
  • linux linux kernel6.13 and later · before 6.18.22
  • linux linux kernel6.19 and later · before 6.19.12
  • linux linux kernel7.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 3.19affected
    • ac584af599452748187cf6d7865b1607c54ee443 and later · before 8ddfe6495c245226a30d8b36e2f4a7aa7712e8d6affected · git
    • ac584af599452748187cf6d7865b1607c54ee443 and later · before 64b24b713e1a3ea6624480594b4f8c2ff86502f2affected · git
    • ac584af599452748187cf6d7865b1607c54ee443 and later · before f72b5567f7c117b46b4058dc6a0c7554f8565561affected · git
    • ac584af599452748187cf6d7865b1607c54ee443 and later · before 1603dd471f47762e9d1f52304edb3e49a7e62655affected · git
    • ac584af599452748187cf6d7865b1607c54ee443 and later · before 99f31aa98ab6e3805c455b65bcd01b3d48bdf1a5affected · git
    • ac584af599452748187cf6d7865b1607c54ee443 and later · before eae19cab44204537f79146f15a51811b13227c38affected · git
    • ac584af599452748187cf6d7865b1607c54ee443 and later · before de3f923ae7d91480ed3ecea1b1e1fc0dc25b597daffected · git
    • ac584af599452748187cf6d7865b1607c54ee443 and later · before 3fb43a7a5b44713f892c58ead2e5f3a1bc9f4ee7affected · git
    • before 3.19not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.170-16.1.170-1
Debian:13linuxbefore 6.12.85-16.12.85-1
Debian:14linuxbefore 6.19.12-16.19.12-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-31744May 1, 2026 · PM: EM: Fix NULL pointer dereference when perf domain ID is not found
    22Monitor
  • ← EarlierCVE-2026-31745May 1, 2026 · reset: gpio: fix double free in reset_add_gpio_aux_device() error path
    31Monitor
  • Later →CVE-2026-31748May 1, 2026 · comedi: me_daq: Fix potential overrun of firmware buffer
    31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux1603dd471f47762e9d1f52304edb3e49a7e62655Vendor (CNA)
Linux Linux3fb43a7a5b44713f892c58ead2e5f3a1bc9f4ee7Vendor (CNA)
Linux Linux64b24b713e1a3ea6624480594b4f8c2ff86502f2Vendor (CNA)
Linux Linux8ddfe6495c245226a30d8b36e2f4a7aa7712e8d6Vendor (CNA)
Linux Linux99f31aa98ab6e3805c455b65bcd01b3d48bdf1a5Vendor (CNA)
Linux Linuxde3f923ae7d91480ed3ecea1b1e1fc0dc25b597dVendor (CNA)
Linux Linuxeae19cab44204537f79146f15a51811b13227c38Vendor (CNA)
Linux Linuxf72b5567f7c117b46b4058dc6a0c7554f8565561Vendor (CNA)
debian:linux6.1.170-1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-787 · Out-of-bounds Write

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records