CVE-2026-31751

Kernel crash via unchecked I/O port write

Published May 1, 2026 · Updated May 1, 2026

Denial of service in the Linux kernel dt2815 Comedi driver allows local users to crash the kernel via COMEDI_DEVCONFIG. The dt2815_attach path writes to an arbitrary I/O port without first confirming that DT2815 hardware is present, and outb() can fault when the port is unbacked. Exploitation requires local low-privileged access, the dt2815 driver, selection of an unused I/O address, and a favorable race; the bounded impact is a kernel crash and service interruption.

CVSS severity4.7
Medium
EPSS probability0.09%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in the Linux kernel dt2815 Comedi driver allows local users to crash the kernel via COMEDI_DEVCONFIG. The dt2815_attach path writes to an arbitrary I/O port without first confirming that DT2815 hardware is present, and outb() can fault when the port is unbacked. Exploitation requires local low-privileged access, the dt2815 driver, selection of an unused I/O address, and a favorable race; the bounded impact is a kernel crash and service interruption.

The record

CVE
CVE-2026-31751
Published
May 1, 2026
Updated
May 1, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499
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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0dcf33994b8dcf3db36530fb7e2cf9f89e5cbac3
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <34b13250c618d7441508c6ef369144aa8a9b9bfa
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <34c8b3a91bdfbe4573650b4cd750ef639101fdc5
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <65c528fbeddd88478c210052f6c7b21be4973156
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8d63161837f1bf8810dbcd2a583c2bbf5ca6d733
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <93853512f565e625df2397f0d8050d6aafd7c3ad
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d2a786efdb9971f2a647724625da5bbecc994dc9
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d5d9df8b08d68d083ac57abc2c887dfb1f31af63

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0dcf33994b8dcf3db36530fb7e2cf9f89e5cbac3; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <34b13250c618d7441508c6ef369144aa8a9b9bfa; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <34c8b3a91bdfbe4573650b4cd750ef639101fdc5; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <65c528fbeddd88478c210052f6c7b21be4973156; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8d63161837f1bf8810dbcd2a583c2bbf5ca6d733; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <93853512f565e625df2397f0d8050d6aafd7c3ad; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d2a786efdb9971f2a647724625da5bbecc994dc9; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d5d9df8b08d68d083ac57abc2c887dfb1f31af63

Published CVSS scores

4.7UbuntuCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/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

T1499Endpoint Denial of Service

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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