CVE-2025-38530

Kernel-memory disclosure via unchecked IRQ bit shift

Published Aug 16, 2025 · Updated May 11, 2026

Out-of-bounds read in the Linux kernel comedi pcl812 driver allows local users to disclose kernel memory via a crafted IRQ option. The attach-time IRQ check shifts the constant 1 by unchecked it->options[1] from userspace, permitting a negative or excessive shift count. Access to configure the comedi device is required; the grounded consequence is kernel-memory disclosure, while published sources do not identify the precise availability failure mode.

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 Linux kernel comedi pcl812 driver allows local users to disclose kernel memory via a crafted IRQ option. The attach-time IRQ check shifts the constant 1 by unchecked it->options[1] from userspace, permitting a negative or excessive shift count. Access to configure the comedi device is required; the grounded consequence is kernel-memory disclosure, while published sources do not identify the precise availability failure mode.

The record

CVE
CVE-2025-38530
Published
Aug 16, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125
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=2.6.30
  2. Affected versionversion=fcdb427bc7cf5e9e5d7280cf09c08dec49b49432 <0489c30d080f07cc7f09d04de723d8c2ccdb61ef
  3. Affected versionversion=fcdb427bc7cf5e9e5d7280cf09c08dec49b49432 <16c173abee315953fd17a279352fec4a1faee862
  4. Affected versionversion=fcdb427bc7cf5e9e5d7280cf09c08dec49b49432 <29ef03e5b84431171d6b77b822985b54bc44b793
  5. Affected versionversion=fcdb427bc7cf5e9e5d7280cf09c08dec49b49432 <374d9b3eb4b08407997ef1fce96119d31e0c0bc4
  6. Affected versionversion=fcdb427bc7cf5e9e5d7280cf09c08dec49b49432 <5bfa301e1e59a9b1a7b62a800b54852337c97416
  7. Affected versionversion=fcdb427bc7cf5e9e5d7280cf09c08dec49b49432 <7e470d8efd10725b189ca8951973a8425932398a
  8. Affected versionversion=fcdb427bc7cf5e9e5d7280cf09c08dec49b49432 <a27e27eee313fe1c450b6af1e80e64412546cab4
  9. Affected versionversion=fcdb427bc7cf5e9e5d7280cf09c08dec49b49432 <b14b076ce593f72585412fc7fd3747e03a5e3632

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.30; version=fcdb427bc7cf5e9e5d7280cf09c08dec49b49432 <0489c30d080f07cc7f09d04de723d8c2ccdb61ef; version=fcdb427bc7cf5e9e5d7280cf09c08dec49b49432 <16c173abee315953fd17a279352fec4a1faee862; version=fcdb427bc7cf5e9e5d7280cf09c08dec49b49432 <29ef03e5b84431171d6b77b822985b54bc44b793; version=fcdb427bc7cf5e9e5d7280cf09c08dec49b49432 <374d9b3eb4b08407997ef1fce96119d31e0c0bc4; version=fcdb427bc7cf5e9e5d7280cf09c08dec49b49432 <5bfa301e1e59a9b1a7b62a800b54852337c97416; version=fcdb427bc7cf5e9e5d7280cf09c08dec49b49432 <7e470d8efd10725b189ca8951973a8425932398a; version=fcdb427bc7cf5e9e5d7280cf09c08dec49b49432 <a27e27eee313fe1c450b6af1e80e64412546cab4; version=fcdb427bc7cf5e9e5d7280cf09c08dec49b49432 <b14b076ce593f72585412fc7fd3747e03a5e3632

Published CVSS scores

5.5Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6.1SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H
7.1NVDCVSS: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

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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