CVE-2026-89617

Out-of-bounds access via unchecked dirty-page entries

Published Sep 11, 2026 · Updated Sep 11, 2026

Out-of-bounds access in Linux 5.15 fs/ntfs3 allows attackers to access memory outside a dirty-page entry during NTFS log replay. check_rstbl() accepts an on-disk lcns_follow count without ensuring that the trailing page_lcns array fits within its DIR_PAGE_ENTRY, so conversion and replay operations run past the entry. The flaw is reached when an affected kernel replays a crafted dirty-page table; published material does not specify whether the overrun causes disclosure, code execution, or service interruption.

CVSS severityUnavailable
Unscored
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds access in Linux 5.15 fs/ntfs3 allows attackers to access memory outside a dirty-page entry during NTFS log replay. check_rstbl() accepts an on-disk lcns_follow count without ensuring that the trailing page_lcns array fits within its DIR_PAGE_ENTRY, so conversion and replay operations run past the entry. The flaw is reached when an affected kernel replays a crafted dirty-page table; published material does not specify whether the overrun causes disclosure, code execution, or service interruption.

The record

CVE
CVE-2026-89617
Published
Sep 11, 2026
Updated
Sep 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.15
  2. Affected versionversion=b46acd6a6a627d876898e1c84d3f84902264b445 <006cb7713dec10368e699abc4367e5faa334c9a5
  3. Affected versionversion=b46acd6a6a627d876898e1c84d3f84902264b445 <0908da07c23be4f94b99dfd9a94765525f0fe4bd
  4. Affected versionversion=b46acd6a6a627d876898e1c84d3f84902264b445 <1200c2779c43b62656ccbb67df9468a7a9af2484
  5. Affected versionversion=b46acd6a6a627d876898e1c84d3f84902264b445 <2d94ffc9d7b5bb3517b129fe63b52d84bcd4ae56

What conditions does exploitation require?

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

What is affected?

The Linux Kernel Organization · Linuxversion=5.15; version=b46acd6a6a627d876898e1c84d3f84902264b445 <006cb7713dec10368e699abc4367e5faa334c9a5; version=b46acd6a6a627d876898e1c84d3f84902264b445 <0908da07c23be4f94b99dfd9a94765525f0fe4bd; version=b46acd6a6a627d876898e1c84d3f84902264b445 <1200c2779c43b62656ccbb67df9468a7a9af2484; version=b46acd6a6a627d876898e1c84d3f84902264b445 <2d94ffc9d7b5bb3517b129fe63b52d84bcd4ae56

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)
VectorUnavailable
PrivilegesUnavailable
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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