CVE-2026-80656Public exploit

Uninitialized-value use via malformed HFS+ node size

Published Aug 28, 2026 · Updated Aug 28, 2026

Improper validation in Linux 7.1 allows local users to trigger uninitialized-value use by mounting a corrupted HFS+ image. The HFS+ B-tree opener accepts a node_size of 1, causing hfs_bnode_find to pass an excessive record offset and leave its off variable uninitialized. The reproducer requires local mount privileges; upstream testing did not classify the condition as denial of service or exploitable.

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

What happened

Improper validation in Linux 7.1 allows local users to trigger uninitialized-value use by mounting a corrupted HFS+ image. The HFS+ B-tree opener accepts a node_size of 1, causing hfs_bnode_find to pass an excessive record offset and leave its off variable uninitialized. The reproducer requires local mount privileges; upstream testing did not classify the condition as denial of service or exploitable.

The record

CVE
CVE-2026-80656
Published
Aug 28, 2026
Updated
Aug 28, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Aug 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 28, 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=7.1
  2. Affected versionversion=8ad2c6a36ac4328072377906a47ea0bff11e4032 <306265eb9384d2c224f1b14d83a29323f0eab6d1
  3. Affected versionversion=8ad2c6a36ac4328072377906a47ea0bff11e4032 <3f95e2661574ff13f099dd13456751933c280628

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=7.1; version=8ad2c6a36ac4328072377906a47ea0bff11e4032 <306265eb9384d2c224f1b14d83a29323f0eab6d1; version=8ad2c6a36ac4328072377906a47ea0bff11e4032 <3f95e2661574ff13f099dd13456751933c280628

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.

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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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

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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