CVE-2026-89616Hinoki check available

Kernel memory disclosure via unzeroed decompression tail

Published Sep 11, 2026 · Updated Sep 11, 2026

Information disclosure in Linux kernel ntfs3 allows local users to read uninitialized kernel memory via a crafted compressed NTFS file. In ni_read_frame(), decompress_lznt() can return fewer bytes than the frame size, but the unwritten tail is marked current and returned without being zeroed. Reading an attacker-crafted compressed file on a mounted NTFS volume exposes recently freed kernel page contents, including pointers that defeat KASLR.

CVSS severityUnavailable
Unscored
EPSS probability0.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Information disclosure in Linux kernel ntfs3 allows local users to read uninitialized kernel memory via a crafted compressed NTFS file. In ni_read_frame(), decompress_lznt() can return fewer bytes than the frame size, but the unwritten tail is marked current and returned without being zeroed. Reading an attacker-crafted compressed file on a mounted NTFS volume exposes recently freed kernel page contents, including pointers that defeat KASLR.

The record

CVE
CVE-2026-89616
Published
Sep 11, 2026
Updated
Sep 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1005
Attack vector
local
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=4342306f0f0d5ff4315a204d315c1b51b914fca5 <0f699ddb290a24b37e1bc9bf1e3c9dbccf564bea
  2. Affected versionversion=4342306f0f0d5ff4315a204d315c1b51b914fca5 <35d1ea92c7d946e2ebdbe36cdb2c969c8704bebd
  3. Affected versionversion=4342306f0f0d5ff4315a204d315c1b51b914fca5 <376ee45659a4b943df672ad275c63da00655f929
  4. Affected versionversion=4342306f0f0d5ff4315a204d315c1b51b914fca5 <4a1b39b2e10eb8de86265e80cf2be4396bc1dce4
  5. Affected versionversion=5.15

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=4342306f0f0d5ff4315a204d315c1b51b914fca5 <0f699ddb290a24b37e1bc9bf1e3c9dbccf564bea; version=4342306f0f0d5ff4315a204d315c1b51b914fca5 <35d1ea92c7d946e2ebdbe36cdb2c969c8704bebd; version=4342306f0f0d5ff4315a204d315c1b51b914fca5 <376ee45659a4b943df672ad275c63da00655f929; version=4342306f0f0d5ff4315a204d315c1b51b914fca5 <4a1b39b2e10eb8de86265e80cf2be4396bc1dce4; version=5.15

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
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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