CVE-2025-38483

Local service interruption via unchecked IRQ shift

Published Jul 28, 2025 · Updated May 11, 2026

Undefined shift behavior in the Linux kernel's das16m1 Comedi driver allows local users to interrupt service through a crafted attach option. The das16m1_attach path uses unchecked signed it->options[1] as the shift count in an IRQ-support bitmask test, so negative or oversized values invoke an out-of-bounds shift. Published assessments agree on local low-privileged reachability; Oracle reports availability-only impact, while Ubuntu also reports confidentiality impact.

CVSS severity7.1
High
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Undefined shift behavior in the Linux kernel's das16m1 Comedi driver allows local users to interrupt service through a crafted attach option. The das16m1_attach path uses unchecked signed it->options[1] as the shift count in an IRQ-support bitmask test, so negative or oversized values invoke an out-of-bounds shift. Published assessments agree on local low-privileged reachability; Oracle reports availability-only impact, while Ubuntu also reports confidentiality impact.

The record

CVE
CVE-2025-38483
Published
Jul 28, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 28, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=3.14
  2. Affected versionversion=729988507680b2ce934bce61d9ce0ea7b235914c <076b13ee60eb01ed0d140ef261f95534562a3077
  3. Affected versionversion=729988507680b2ce934bce61d9ce0ea7b235914c <539bdff832adac9ea653859fa0b6bc62e743329c
  4. Affected versionversion=729988507680b2ce934bce61d9ce0ea7b235914c <65c03e6fc524eb2868abedffd8a4613d78abc288
  5. Affected versionversion=729988507680b2ce934bce61d9ce0ea7b235914c <adb7df8a8f9d788423e161b779764527dd3ec2d0
  6. Affected versionversion=729988507680b2ce934bce61d9ce0ea7b235914c <b3c95fa508e5dc3da60520eea92a5241095ceef1
  7. Affected versionversion=729988507680b2ce934bce61d9ce0ea7b235914c <d1291c69f46d6572b2cf75960dd8975d7ab2176b
  8. Affected versionversion=729988507680b2ce934bce61d9ce0ea7b235914c <ed93c6f68a3be06e4e0c331c6e751f462dee3932
  9. Affected versionversion=729988507680b2ce934bce61d9ce0ea7b235914c <f211572818ed5bec2b3f5d4e0719ef8699b3c269

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.14; version=729988507680b2ce934bce61d9ce0ea7b235914c <076b13ee60eb01ed0d140ef261f95534562a3077; version=729988507680b2ce934bce61d9ce0ea7b235914c <539bdff832adac9ea653859fa0b6bc62e743329c; version=729988507680b2ce934bce61d9ce0ea7b235914c <65c03e6fc524eb2868abedffd8a4613d78abc288; version=729988507680b2ce934bce61d9ce0ea7b235914c <adb7df8a8f9d788423e161b779764527dd3ec2d0; version=729988507680b2ce934bce61d9ce0ea7b235914c <b3c95fa508e5dc3da60520eea92a5241095ceef1; version=729988507680b2ce934bce61d9ce0ea7b235914c <d1291c69f46d6572b2cf75960dd8975d7ab2176b; version=729988507680b2ce934bce61d9ce0ea7b235914c <ed93c6f68a3be06e4e0c331c6e751f462dee3932; version=729988507680b2ce934bce61d9ce0ea7b235914c <f211572818ed5bec2b3f5d4e0719ef8699b3c269

Published CVSS scores

5.5OracleCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.1CanonicalCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-125Out-of-bounds Read
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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