CVE-2026-89998

Invalid kernel memory access via unlocked list walk

Published Sep 16, 2026 · Updated Sep 16, 2026

Use-after-free in Linux device mapper allows local users to access invalid kernel memory via concurrent table-load ioctls. The dm_setup_md_queue function walks md->table_devices without holding the list lock while a failed load can destroy and release an entry. Reaching the race requires two concurrent device-mapper table-load ioctls; the published source does not state the exact privilege boundary or a consequence beyond invalid memory access.

CVSS severityUnavailable
Unscored
EPSS probabilityUnavailable
No score available in this record
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

Use-after-free in Linux device mapper allows local users to access invalid kernel memory via concurrent table-load ioctls. The dm_setup_md_queue function walks md->table_devices without holding the list lock while a failed load can destroy and release an entry. Reaching the race requires two concurrent device-mapper table-load ioctls; the published source does not state the exact privilege boundary or a consequence beyond invalid memory access.

The record

CVE
CVE-2026-89998
Published
Sep 16, 2026
Updated
Sep 16, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
Unavailable

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=0 <6.1.188
  2. Affected versionversion=0 <6.12.110
  3. Affected versionversion=0 <6.18.51
  4. Affected versionversion=0 <6.6.157
  5. Affected versionversion=0 <7.2.5
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <00ad6f9ed27f91925d4d3fb7aab50a60d774f998
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0ea6e5ad4a5817e91f11b4cc1e022e575ed2e7ca
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5380c7f6335cc6d77eb77d065105e81155c4d9d3
  9. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a1af1884c960b98c621b6fe2fea1216b78c02152
  10. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <af1f32ccf8051f4691ced11feb452b9d13561727
  11. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b02e35b81176c7d61dd441cc7a2e5c324a82444b

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=0 <6.1.188; version=0 <6.12.110; version=0 <6.18.51; version=0 <6.6.157; version=0 <7.2.5; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <00ad6f9ed27f91925d4d3fb7aab50a60d774f998; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0ea6e5ad4a5817e91f11b4cc1e022e575ed2e7ca; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5380c7f6335cc6d77eb77d065105e81155c4d9d3; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a1af1884c960b98c621b6fe2fea1216b78c02152; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <af1f32ccf8051f4691ced11feb452b9d13561727; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b02e35b81176c7d61dd441cc7a2e5c324a82444b

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.

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

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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

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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