CVE-2026-89781Hinoki check available

Out-of-bounds read via unchecked NTFS log offset

Published Sep 16, 2026 · Updated Sep 16, 2026

An out-of-bounds read in Linux kernel NTFS3 journal replay allows local users to read beyond a slab buffer by mounting a crafted NTFS image. The read_log_rec_buf() path accepts record_header_len and data_off from the on-disk restart area after checking only alignment, allowing off to exceed page_size so tail underflows before memcpy(). Reaching the flaw requires permission to mount an attacker-controlled NTFS image; the demonstrated result is a KASAN-detected slab over-read during log replay.

CVSS severityUnavailable
Unscored
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

An out-of-bounds read in Linux kernel NTFS3 journal replay allows local users to read beyond a slab buffer by mounting a crafted NTFS image. The read_log_rec_buf() path accepts record_header_len and data_off from the on-disk restart area after checking only alignment, allowing off to exceed page_size so tail underflows before memcpy(). Reaching the flaw requires permission to mount an attacker-controlled NTFS image; the demonstrated result is a KASAN-detected slab over-read during log replay.

The record

CVE
CVE-2026-89781
Published
Sep 16, 2026
Updated
Sep 16, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Sep 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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=5.15
  2. Affected versionversion=b46acd6a6a627d876898e1c84d3f84902264b445 <1b2d31f1083beb80c55d1152249f652c1445a559
  3. Affected versionversion=b46acd6a6a627d876898e1c84d3f84902264b445 <49f7cbc902b08b56eb7d2633163ecc57a0e7145a
  4. Affected versionversion=b46acd6a6a627d876898e1c84d3f84902264b445 <53e56f7aa1d0f950a8bc2e4cdb3ba9fe45967531
  5. Affected versionversion=b46acd6a6a627d876898e1c84d3f84902264b445 <700973cc65db405bde0368ccf88699390150943e
  6. Affected versionversion=b46acd6a6a627d876898e1c84d3f84902264b445 <74a83aa05f73033af719771ab1f0c269928b4865
  7. Affected versionversion=b46acd6a6a627d876898e1c84d3f84902264b445 <de603b9d377fab57a5e6432fa84a9f36b32c1636
  8. Affected versionversion=b46acd6a6a627d876898e1c84d3f84902264b445 <df099bfdb57773ba7f40f8a9dcc82e75af277922

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=5.15; version=b46acd6a6a627d876898e1c84d3f84902264b445 <1b2d31f1083beb80c55d1152249f652c1445a559; version=b46acd6a6a627d876898e1c84d3f84902264b445 <49f7cbc902b08b56eb7d2633163ecc57a0e7145a; version=b46acd6a6a627d876898e1c84d3f84902264b445 <53e56f7aa1d0f950a8bc2e4cdb3ba9fe45967531; version=b46acd6a6a627d876898e1c84d3f84902264b445 <700973cc65db405bde0368ccf88699390150943e; version=b46acd6a6a627d876898e1c84d3f84902264b445 <74a83aa05f73033af719771ab1f0c269928b4865; version=b46acd6a6a627d876898e1c84d3f84902264b445 <de603b9d377fab57a5e6432fa84a9f36b32c1636; version=b46acd6a6a627d876898e1c84d3f84902264b445 <df099bfdb57773ba7f40f8a9dcc82e75af277922

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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