CVE-2026-89851

Kernel crash via NULL result pointer

Published Sep 16, 2026 · Updated Sep 16, 2026

NULL-pointer dereference in Linux kernel qla2xxx allows local users to crash the kernel via a valid numeric FCE debugfs write. The qla2x00_dfs_fce_write function passes a NULL result pointer to kstrtoul and assigns the conversion status to the enable flag. Reaching the path requires write access to root-only debugfs by default and a supported QLogic adapter; a successful parse triggers a kernel oops.

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

NULL-pointer dereference in Linux kernel qla2xxx allows local users to crash the kernel via a valid numeric FCE debugfs write. The qla2x00_dfs_fce_write function passes a NULL result pointer to kstrtoul and assigns the conversion status to the enable flag. Reaching the path requires write access to root-only debugfs by default and a supported QLogic adapter; a successful parse triggers a kernel oops.

The record

CVE
CVE-2026-89851
Published
Sep 16, 2026
Updated
Sep 16, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
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

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=217230bc8796a922d5b15a9a94ec4414b2d2b3e3 <5762d992dddaf301e7fb78f797de407116847121
  2. Affected versionversion=2cf3c3fe9a11aa168e80c966494c58548b9aed5d <eff41f50461c238bd2c5cd20672a5b53e68d493a
  3. Affected versionversion=3a5a789494875376d1f8063ec5ecc6beafda2ce1 <b0c08c08a08b6cca0e7e192bcbe0514e41fcc55f
  4. Affected versionversion=5.10.235 <5.10.270
  5. Affected versionversion=5.15.179 <5.15.221
  6. Affected versionversion=57c029cab0d908942e3ed9ff9fd0361144d01944 <f5e245164d187d1ee227140c8b2e83b67f59c1fd
  7. Affected versionversion=6.1.129 <6.1.188
  8. Affected versionversion=6.12.14 <6.12.110
  9. Affected versionversion=6.13.3 <6.14
  10. Affected versionversion=6.14
  11. Affected versionversion=6.6.78 <6.6.157
  12. Affected versionversion=73d3d3c66f108bc47922490f8500842530139975 <9932cbd0b49d0a5ab8378d32650ffb51604ffa35
  13. Affected versionversion=841df27d619ee1f5ca6473e15227b39d6136562d <7203d4aed8f444e7376c2dee8d93577b37cf9989
  14. Affected versionversion=841df27d619ee1f5ca6473e15227b39d6136562d <aac0d3cb9199121d2ce5906e06f94b793fac1052
  15. Affected versionversion=841df27d619ee1f5ca6473e15227b39d6136562d <b7368687e3d11f51392d3c4774ec0263d5fbf31f
  16. Affected versionversion=a89872a61b914378591f16e428dd221c5e2059b2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=217230bc8796a922d5b15a9a94ec4414b2d2b3e3 <5762d992dddaf301e7fb78f797de407116847121; version=2cf3c3fe9a11aa168e80c966494c58548b9aed5d <eff41f50461c238bd2c5cd20672a5b53e68d493a; version=3a5a789494875376d1f8063ec5ecc6beafda2ce1 <b0c08c08a08b6cca0e7e192bcbe0514e41fcc55f; version=5.10.235 <5.10.270; version=5.15.179 <5.15.221; version=57c029cab0d908942e3ed9ff9fd0361144d01944 <f5e245164d187d1ee227140c8b2e83b67f59c1fd; version=6.1.129 <6.1.188; version=6.12.14 <6.12.110; version=6.13.3 <6.14; version=6.14; version=6.6.78 <6.6.157; version=73d3d3c66f108bc47922490f8500842530139975 <9932cbd0b49d0a5ab8378d32650ffb51604ffa35; version=841df27d619ee1f5ca6473e15227b39d6136562d <7203d4aed8f444e7376c2dee8d93577b37cf9989; version=841df27d619ee1f5ca6473e15227b39d6136562d <aac0d3cb9199121d2ce5906e06f94b793fac1052; version=841df27d619ee1f5ca6473e15227b39d6136562d <b7368687e3d11f51392d3c4774ec0263d5fbf31f; version=a89872a61b914378591f16e428dd221c5e2059b2

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

T1499Endpoint Denial of Service

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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