CVE-2025-38529

Kernel data exposure and crash via unchecked shift

Published Aug 16, 2025 · Updated May 11, 2026

Out-of-bounds read in the aio_iiro_16 Comedi driver allows local users to expose kernel data or crash an affected Linux system. The driver uses the unchecked userspace-supplied it->options[1] IRQ value as a bit-shift count before verifying that it is between 1 and 15. Exploitation requires local low-privileged access to configure the affected Comedi driver, and the consequence is limited to kernel-data disclosure or a system crash.

CVSS severity7.1
High
EPSS probability0.18%
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 aio_iiro_16 Comedi driver allows local users to expose kernel data or crash an affected Linux system. The driver uses the unchecked userspace-supplied it->options[1] IRQ value as a bit-shift count before verifying that it is between 1 and 15. Exploitation requires local low-privileged access to configure the affected Comedi driver, and the consequence is limited to kernel-data disclosure or a system crash.

The record

CVE
CVE-2025-38529
Published
Aug 16, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 16, 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=4.0
  2. Affected versionversion=ad7a370c8be47247f68f7187cc82f4f25a347116 <43ddd82e6a91913cea1c078e782afd8de60c3a53
  3. Affected versionversion=ad7a370c8be47247f68f7187cc82f4f25a347116 <5ac7c60439236fb691b8c7987390e2327bbf18fa
  4. Affected versionversion=ad7a370c8be47247f68f7187cc82f4f25a347116 <66acb1586737a22dd7b78abc63213b1bcaa100e4
  5. Affected versionversion=ad7a370c8be47247f68f7187cc82f4f25a347116 <955e8835855fed8e87f7d8c8075564a1746c1b4c
  6. Affected versionversion=ad7a370c8be47247f68f7187cc82f4f25a347116 <a88692245c315bf8e225f205297a6f4b13d6856a
  7. Affected versionversion=ad7a370c8be47247f68f7187cc82f4f25a347116 <c593215385f0c0163015cca4512ed3ff42875d19
  8. Affected versionversion=ad7a370c8be47247f68f7187cc82f4f25a347116 <e0f3c0867d7d231c70984f05c97752caacd0daba
  9. Affected versionversion=ad7a370c8be47247f68f7187cc82f4f25a347116 <ff30dd3f15f443d2a0085b12ec2cc95d44f35fa7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.0; version=ad7a370c8be47247f68f7187cc82f4f25a347116 <43ddd82e6a91913cea1c078e782afd8de60c3a53; version=ad7a370c8be47247f68f7187cc82f4f25a347116 <5ac7c60439236fb691b8c7987390e2327bbf18fa; version=ad7a370c8be47247f68f7187cc82f4f25a347116 <66acb1586737a22dd7b78abc63213b1bcaa100e4; version=ad7a370c8be47247f68f7187cc82f4f25a347116 <955e8835855fed8e87f7d8c8075564a1746c1b4c; version=ad7a370c8be47247f68f7187cc82f4f25a347116 <a88692245c315bf8e225f205297a6f4b13d6856a; version=ad7a370c8be47247f68f7187cc82f4f25a347116 <c593215385f0c0163015cca4512ed3ff42875d19; version=ad7a370c8be47247f68f7187cc82f4f25a347116 <e0f3c0867d7d231c70984f05c97752caacd0daba; version=ad7a370c8be47247f68f7187cc82f4f25a347116 <ff30dd3f15f443d2a0085b12ec2cc95d44f35fa7

Published CVSS scores

7.1NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
7.1Canonical UbuntuCVSS: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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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
T1499.004Application or System Exploitation

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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