CVE-2025-38613

Kernel stack disclosure via uninitialized ioctl padding

Published Aug 19, 2025 · Updated May 11, 2026

Information disclosure in Linux 6.13 through 6.16 allows local users to read kernel stack data via a GPIB board-info ioctl. The board_info_ioctl function copies gpib_board_info_ioctl to userspace without first clearing a newly added padding field, so stale stack bytes occupy that field. Reachability requires local access to the GPIB ioctl interface; disclosure is limited to uninitialized structure padding, with no supported data modification.

CVSS severity5.5
Medium
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Linux 6.13 through 6.16 allows local users to read kernel stack data via a GPIB board-info ioctl. The board_info_ioctl function copies gpib_board_info_ioctl to userspace without first clearing a newly added padding field, so stale stack bytes occupy that field. Reachability requires local access to the GPIB ioctl interface; disclosure is limited to uninitialized structure padding, with no supported data modification.

The record

CVE
CVE-2025-38613
Published
Aug 19, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-908, T1005
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 19, 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=6.13
  2. Affected versionversion=9dde4559e93955ccc47d588f7fd051684d55c4e7 <19dedd4f70f5a6505e7c601ef7dd40542d1d9aa5
  3. Affected versionversion=9dde4559e93955ccc47d588f7fd051684d55c4e7 <a739d3b13bff0dfa1aec679d08c7062131a2a425

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.13; version=9dde4559e93955ccc47d588f7fd051684d55c4e7 <19dedd4f70f5a6505e7c601ef7dd40542d1d9aa5; version=9dde4559e93955ccc47d588f7fd051684d55c4e7 <a739d3b13bff0dfa1aec679d08c7062131a2a425

Published CVSS scores

6.9SUSECVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N
7.1SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
5.5NIST NVDCVSS:3.1/AV:L/AC:L/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

CWE-908Use of Uninitialized Resource
T1005Data from Local System

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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