CVE-2026-89842

Firmware reset disruption via unguarded LS reject

Published Sep 16, 2026 · Updated Sep 16, 2026

Improper state validation in Linux 6.6 and affected qla2xxx revisions allows attackers to disrupt a firmware reset through an NVMe LS response. The qla_nvme_xmt_ls_rsp and qla2xxx_process_purls_pkt paths emit an LS reject IOCB and write the queue doorbell even when fw_started is clear. The condition requires qla2xxx-managed NVMe/Fibre Channel hardware during a firmware stop, reset, or EEH window; no external trigger or broader impact is published.

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

Improper state validation in Linux 6.6 and affected qla2xxx revisions allows attackers to disrupt a firmware reset through an NVMe LS response. The qla_nvme_xmt_ls_rsp and qla2xxx_process_purls_pkt paths emit an LS reject IOCB and write the queue doorbell even when fw_started is clear. The condition requires qla2xxx-managed NVMe/Fibre Channel hardware during a firmware stop, reset, or EEH window; no external trigger or broader impact is published.

The record

CVE
CVE-2026-89842
Published
Sep 16, 2026
Updated
Sep 16, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
Unavailable
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=6.6
  2. Affected versionversion=875386b98857822b77ac7f95bdf367b70af5b78c <2935b730211c5c1433aa6101fa3b55df2b63869a
  3. Affected versionversion=875386b98857822b77ac7f95bdf367b70af5b78c <7c1fc75dd3fb6b6414508fbdf7aeed0d757c9120
  4. Affected versionversion=875386b98857822b77ac7f95bdf367b70af5b78c <ac4b019ac07844d3f67ea5e48b1d982b2170d1a7
  5. Affected versionversion=875386b98857822b77ac7f95bdf367b70af5b78c <e9bfb56e2c1bda49d3c5442d824569d71eec07e2
  6. Affected versionversion=875386b98857822b77ac7f95bdf367b70af5b78c <f7e46ebffc5781aab3f1f5a5d4350addbb5833f4

What conditions does exploitation require?

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

What is affected?

The Linux Kernel Organization · Linuxversion=6.6; version=875386b98857822b77ac7f95bdf367b70af5b78c <2935b730211c5c1433aa6101fa3b55df2b63869a; version=875386b98857822b77ac7f95bdf367b70af5b78c <7c1fc75dd3fb6b6414508fbdf7aeed0d757c9120; version=875386b98857822b77ac7f95bdf367b70af5b78c <ac4b019ac07844d3f67ea5e48b1d982b2170d1a7; version=875386b98857822b77ac7f95bdf367b70af5b78c <e9bfb56e2c1bda49d3c5442d824569d71eec07e2; version=875386b98857822b77ac7f95bdf367b70af5b78c <f7e46ebffc5781aab3f1f5a5d4350addbb5833f4

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

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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