CVE-2026-89169

Boot integrity bypass via missing verity file

Published Sep 11, 2026 · Updated Sep 11, 2026

Security feature bypass in Debian live-boot ff8867c4e2d62e497cb895b15b7d6d518d5adff1 allows attackers to boot modified root filesystems. The early-userspace overlay logic applies dm-verity mount options only when a sibling .verity hash-table file exists, so deleting that file skips verification even when signature enforcement was requested. Exploitation requires control of the live medium or its filesystem contents and results in a manipulated root filesystem booting without the promised authenticity and integrity enforcement.

CVSS severityUnavailable
Unscored
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Security feature bypass in Debian live-boot ff8867c4e2d62e497cb895b15b7d6d518d5adff1 allows attackers to boot modified root filesystems. The early-userspace overlay logic applies dm-verity mount options only when a sibling .verity hash-table file exists, so deleting that file skips verification even when signature enforcement was requested. Exploitation requires control of the live medium or its filesystem contents and results in a manipulated root filesystem booting without the promised authenticity and integrity enforcement.

The record

CVE
CVE-2026-89169
Published
Sep 11, 2026
Updated
Sep 11, 2026
Vendor
Debian
Product
live-boot
Classifications
T1553
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 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?

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  1. Affected versionversion=ff8867c4e2d62e497cb895b15b7d6d518d5adff1

What conditions does exploitation require?

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

What is affected?

Debian · live-bootversion=ff8867c4e2d62e497cb895b15b7d6d518d5adff1

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

T1553Subvert Trust Controls

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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