CVE-2026-99086Public exploit

Kernel crash via unchecked superblock reload

Published Oct 23, 2026 · Updated Oct 23, 2026

Memory corruption in Linux dm-integrity allows local users to crash the kernel via a modified on-disk superblock. dm_integrity_resume() reloads geometry without checking it against the constructor's allocations, so increasing log2_sectors_per_block drives access_journal_data() beyond its journal pages and into a NULL-pointer write. Triggering requires write access to the backing superblock while the target is suspended, followed by resume and journal activity; code execution is not established.

CVSS severityUnavailable
Unscored
EPSS probability0.16%
Next 30 days · Nov 1, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Contact us

Summary

What happened

Memory corruption in Linux dm-integrity allows local users to crash the kernel via a modified on-disk superblock. dm_integrity_resume() reloads geometry without checking it against the constructor's allocations, so increasing log2_sectors_per_block drives access_journal_data() beyond its journal pages and into a NULL-pointer write. Triggering requires write access to the backing superblock while the target is suspended, followed by resume and journal activity; code execution is not established.

The record

CVE
CVE-2026-99086
Published
Oct 23, 2026
Updated
Oct 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 23, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=118ba36e446c01e3cd34b3eedabf1d9436525e1d <e9ec5cbbaf4dd3a02ae3d81719f4fcb9b609aa8e
  2. Affected versionversion=118ba36e446c01e3cd34b3eedabf1d9436525e1d <fc79aeb86a2c244c1f1894e2d8f2966fe2b60fa2
  3. Affected versionversion=38625191f32f77a9d5fc7cc15f4f9b78768bfb33 <454b67fcc28c18502e47dfb9f067b04c28628ada
  4. Affected versionversion=3ff70e2e31c419e2230d0c66cb2bfb3b1b414b7f
  5. Affected versionversion=6.1.165 <6.2
  6. Affected versionversion=6.12.75 <6.13
  7. Affected versionversion=6.18.16 <6.18.58
  8. Affected versionversion=6.19.6 <6.20
  9. Affected versionversion=6.6.128 <6.7
  10. Affected versionversion=7.0
  11. Affected versionversion=824b9c27d7b600520b95f0cab95a47d1b08a9483
  12. Affected versionversion=c6138af1f5454c2631a837916fda958ea72c0d71
  13. Affected versionversion=fb49f209995f729053c6ee728436f98d78a49b6f

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=118ba36e446c01e3cd34b3eedabf1d9436525e1d <e9ec5cbbaf4dd3a02ae3d81719f4fcb9b609aa8e; version=118ba36e446c01e3cd34b3eedabf1d9436525e1d <fc79aeb86a2c244c1f1894e2d8f2966fe2b60fa2; version=38625191f32f77a9d5fc7cc15f4f9b78768bfb33 <454b67fcc28c18502e47dfb9f067b04c28628ada; version=3ff70e2e31c419e2230d0c66cb2bfb3b1b414b7f; version=6.1.165 <6.2; version=6.12.75 <6.13; version=6.18.16 <6.18.58; version=6.19.6 <6.20; version=6.6.128 <6.7; version=7.0; version=824b9c27d7b600520b95f0cab95a47d1b08a9483; version=c6138af1f5454c2631a837916fda958ea72c0d71; version=fb49f209995f729053c6ee728436f98d78a49b6f

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.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Get started to see how Hinoki identifies affected software and validates exploitability in your environment.

Contact us