CVE-2026-23388

Out-of-bounds read via negative metadata offset

Published Mar 25, 2026 · Updated Mar 25, 2026

Out-of-bounds read in Linux Kernel Squashfs from 2.6.29 allows attackers to trigger a general protection fault via a corrupted image. A corrupted index lookup produces a negative metadata-block offset that squashfs_read_metadata passes to squashfs_copy_data without a range check. Squashfs must process the image; the reported consequence is an invalid read and fault, with no reported code execution.

CVSS severityUnavailable
Unscored
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Out-of-bounds read in Linux Kernel Squashfs from 2.6.29 allows attackers to trigger a general protection fault via a corrupted image. A corrupted index lookup produces a negative metadata-block offset that squashfs_read_metadata passes to squashfs_copy_data without a range check. Squashfs must process the image; the reported consequence is an invalid read and fault, with no reported code execution.

The record

CVE
CVE-2026-23388
Published
Mar 25, 2026
Updated
Mar 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-125
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Mar 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.6.29
  2. Affected versionversion=f400e12656ab518be107febfe2315fb1eab5a342 <01ee0bcc29864b78249308e8b35042b09bbf5fe3
  3. Affected versionversion=f400e12656ab518be107febfe2315fb1eab5a342 <0c8ab092aec3ac4294940054772d30b511b16713
  4. Affected versionversion=f400e12656ab518be107febfe2315fb1eab5a342 <3b9499e7d677dd4366239a292238489a804936b2
  5. Affected versionversion=f400e12656ab518be107febfe2315fb1eab5a342 <6b847d65f5b0065e02080c61fad93d57d6686383
  6. Affected versionversion=f400e12656ab518be107febfe2315fb1eab5a342 <9e9fa5ad37c9cbad73c165c7ff1e76e650825e7c
  7. Affected versionversion=f400e12656ab518be107febfe2315fb1eab5a342 <fdb24a820a5832ec4532273282cbd4f22c291a0d

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linux Kernelversion=2.6.29; version=f400e12656ab518be107febfe2315fb1eab5a342 <01ee0bcc29864b78249308e8b35042b09bbf5fe3; version=f400e12656ab518be107febfe2315fb1eab5a342 <0c8ab092aec3ac4294940054772d30b511b16713; version=f400e12656ab518be107febfe2315fb1eab5a342 <3b9499e7d677dd4366239a292238489a804936b2; version=f400e12656ab518be107febfe2315fb1eab5a342 <6b847d65f5b0065e02080c61fad93d57d6686383; version=f400e12656ab518be107febfe2315fb1eab5a342 <9e9fa5ad37c9cbad73c165c7ff1e76e650825e7c; version=f400e12656ab518be107febfe2315fb1eab5a342 <fdb24a820a5832ec4532273282cbd4f22c291a0d

Published CVSS scores

No CVSS assessment is available in this record.

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)
VectorUnavailable
PrivilegesUnavailable
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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo