CVE-2026-68448

Protected-file disclosure via wrong OverlayFS credentials

Published Aug 12, 2026 · Updated Aug 12, 2026

Improper access control in affected Linux OverlayFS kernels allows local users to read protected files via cross-filesystem copies. The OverlayFS copy_file_range path checks source-read access with the destination mount's credentials instead of the source mount's credentials. Exploitation requires local access to copy between separate OverlayFS mounts backed by the same filesystem, and the bounded consequence is unauthorized file disclosure.

CVSS severityUnavailable
Unscored
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in affected Linux OverlayFS kernels allows local users to read protected files via cross-filesystem copies. The OverlayFS copy_file_range path checks source-read access with the destination mount's credentials instead of the source mount's credentials. Exploitation requires local access to copy between separate OverlayFS mounts backed by the same filesystem, and the bounded consequence is unauthorized file disclosure.

The record

CVE
CVE-2026-68448
Published
Aug 12, 2026
Updated
Aug 12, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1005
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Aug 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 12, 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=5.3
  2. Affected versionversion=5dae222a5ff0c269730393018a5539cc970a4726 <1f4a107439d2e43db176e34919933e617cb7f2c5
  3. Affected versionversion=5dae222a5ff0c269730393018a5539cc970a4726 <9ec22c8113d8cf72ed7197bb61037dcad09e50d8
  4. Affected versionversion=5dae222a5ff0c269730393018a5539cc970a4726 <a1e0eb8f55cfe09bb31a202a388babc411292656

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=5.3; version=5dae222a5ff0c269730393018a5539cc970a4726 <1f4a107439d2e43db176e34919933e617cb7f2c5; version=5dae222a5ff0c269730393018a5539cc970a4726 <9ec22c8113d8cf72ed7197bb61037dcad09e50d8; version=5dae222a5ff0c269730393018a5539cc970a4726 <a1e0eb8f55cfe09bb31a202a388babc411292656

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)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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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