CVE-2026-89851 - Vulnerability Details

- scsi: qla2xxx: Fix FCE trace enable parsing in debugfs

Description

In the Linux kernel, the following vulnerability has been resolved:

scsi: qla2xxx: Fix FCE trace enable parsing in debugfs

qla2x00_dfs_fce_write() called kstrtoul() with a NULL result pointer,
so a successful parse would dereference NULL and oops. Worse, the int
return value (0 on success, negative errno on failure) was assigned to
the unsigned long enable flag, inverting the intended logic: a valid
number was treated as "disable" while a parse failure enabled FCE.

Parse the value into enable and propagate parse errors to userspace.

Published: 2026-09-16

Score: n/a

EPSS: < 1% Very Low

KEV: No

Impact:

Action:

Analysis

Impact

A null‑pointer dereference in the qla2xxx SCSI driver causes a kernel crash when a privileged user writes malformed data to the debugfs FCE trace file. The bug also inverts the enable/disable logic due to incorrect handling of the return value, potentially misconfiguring FCE tracing. The result is a local denial of service as the kernel Oopses and may reboot or become unreachable until a reboot occurs.

Affected Systems

Linux kernel builds that include the qla2xxx driver and expose the FCE debugfs interface are affected. Any kernel version prior to the upstream patch referenced in the advisory is vulnerable. Specific kernel releases are not enumerated in the advisory, so all kernels with the unpatched qla2xxx code should be treated as susceptible.

Risk and Exploitability

The EPSS score is below 1 % and the vulnerability is not listed in the CISA KEV catalog, indicating a very low probability of public exploitation. Because the debugfs write operation requires root or equivalent privileges, only a local attacker with sufficient permissions can trigger the fault. The impact is a local kernel crash rather than remote code execution. Consequently, the overall risk is moderate, and applying the upstream fix as soon as possible is strongly recommended.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Linux

unaffected

Version	Status	Constraints
`3a5a789494875376d1f8063ec5ecc6beafda2ce1`	affected	< b0c08c08a08b6cca0e7e192bcbe0514e41fcc55f
`73d3d3c66f108bc47922490f8500842530139975`	affected	< 9932cbd0b49d0a5ab8378d32650ffb51604ffa35
`57c029cab0d908942e3ed9ff9fd0361144d01944`	affected	< f5e245164d187d1ee227140c8b2e83b67f59c1fd
`217230bc8796a922d5b15a9a94ec4414b2d2b3e3`	affected	< 5762d992dddaf301e7fb78f797de407116847121
`2cf3c3fe9a11aa168e80c966494c58548b9aed5d`	affected	< eff41f50461c238bd2c5cd20672a5b53e68d493a
`841df27d619ee1f5ca6473e15227b39d6136562d`	affected	< 7203d4aed8f444e7376c2dee8d93577b37cf9989
`841df27d619ee1f5ca6473e15227b39d6136562d`	affected	< aac0d3cb9199121d2ce5906e06f94b793fac1052
`841df27d619ee1f5ca6473e15227b39d6136562d`	affected	< b7368687e3d11f51392d3c4774ec0263d5fbf31f
`a89872a61b914378591f16e428dd221c5e2059b2`	affected	—
`5.10.235`	affected	< 5.10.270
`5.15.179`	affected	< 5.15.221
`6.1.129`	affected	< 6.1.188
`6.6.78`	affected	< 6.6.157
`6.12.14`	affected	< 6.12.110
`6.13.3`	affected	< 6.14

Linux

affected

Version	Status	Constraints
`6.14`	affected	—
`0`	unaffected	< 6.14
`5.10.270`	unaffected	≤ 5.10.*
`5.15.221`	unaffected	≤ 5.15.*
`6.1.188`	unaffected	≤ 6.1.*
`6.6.157`	unaffected	≤ 6.6.*
`6.12.110`	unaffected	≤ 6.12.*
`6.18.51`	unaffected	≤ 6.18.*
`7.2.5`	unaffected	≤ 7.2.*
`7.3-rc1`	unaffected	≤ *

No data.

Vendor Product Confidence Versions

Linux

Linux Kernel

99%

Version	Status	Scheme	Platform
`[3a5a789494875376d1f8063ec5ecc6beafda2ce1,b0c08c08a08b6cca0e7e192bcbe0514e41fcc55f)`	affected	code_commit	—
`[73d3d3c66f108bc47922490f8500842530139975,9932cbd0b49d0a5ab8378d32650ffb51604ffa35)`	affected	code_commit	—
`[57c029cab0d908942e3ed9ff9fd0361144d01944,f5e245164d187d1ee227140c8b2e83b67f59c1fd)`	affected	code_commit	—
`[217230bc8796a922d5b15a9a94ec4414b2d2b3e3,5762d992dddaf301e7fb78f797de407116847121)`	affected	code_commit	—
`[2cf3c3fe9a11aa168e80c966494c58548b9aed5d,eff41f50461c238bd2c5cd20672a5b53e68d493a)`	affected	code_commit	—
`[841df27d619ee1f5ca6473e15227b39d6136562d,7203d4aed8f444e7376c2dee8d93577b37cf9989)`	affected	code_commit	—
`[841df27d619ee1f5ca6473e15227b39d6136562d,aac0d3cb9199121d2ce5906e06f94b793fac1052)`	affected	code_commit	—
`[841df27d619ee1f5ca6473e15227b39d6136562d,b7368687e3d11f51392d3c4774ec0263d5fbf31f)`	affected	code_commit	—
`a89872a61b914378591f16e428dd221c5e2059b2`	affected	code_commit	—
`841df27d619ee1f5ca6473e15227b39d6136562d`	affected	code_commit	—
`[5.10.235,5.10.270)`	affected	semver	—
`[5.15.179,5.15.221)`	affected	semver	—
`[6.1.129,6.1.188)`	affected	semver	—
`[6.6.78,6.6.157)`	affected	semver	—
`[6.12.14,6.12.110)`	affected	semver	—
`[6.13.3,6.14)`	affected	semver	—

Linux

Linux Kernel

99%

Version	Status	Scheme	Platform
`6.14`	affected	semver	—
`[0,6.14)`	unaffected	semver	—
`[5.10.270,5.10.*]`	unaffected	semver	—
`[5.15.221,5.15.*]`	unaffected	semver	—
`[6.1.188,6.1.*]`	unaffected	semver	—
`[6.6.157,6.6.*]`	unaffected	semver	—
`[6.12.110,6.12.*]`	unaffected	semver	—
`[6.18.51,6.18.*]`	unaffected	semver	—
`[7.2.5,7.2.*]`	unaffected	semver	—
`[7.3-rc1,*]`	unaffected	semver	—

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Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

Update the kernel to a version that contains the commit fixing qla2xxx debugfs FCE parsing. This can be achieved by installing the latest distribution update or by manually applying the referenced commit to the source and rebuilding the kernel.
If an immediate kernel upgrade is not feasible, remove the qla2xxx debugfs entry (e.g., by deleting the file or ensuring it is not mounted) to prevent any writes that could trigger the fault.
Restrict write access to the debugfs interface so that only trusted privileged users can modify it, or disable debugfs entirely on hosts where it is not required.

Generated by OpenCVE AI on September 18, 2026 at 09:04 UTC.

Tracking

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Advisories

Source	ID	Title
Debian DLA	DLA-4817-1	linux-6.12 security update
Debian DSA	DSA-6528-1	linux security update

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.0022.

Key SSVC decision points have not yet been added.

References

Link	Providers
https://git.kernel.org/stable/c/5762d992dddaf301e7fb78f797de407116847121
https://git.kernel.org/stable/c/7203d4aed8f444e7376c2dee8d93577b37cf9989
https://git.kernel.org/stable/c/9932cbd0b49d0a5ab8378d32650ffb51604ffa35
https://git.kernel.org/stable/c/aac0d3cb9199121d2ce5906e06f94b793fac1052
https://git.kernel.org/stable/c/b0c08c08a08b6cca0e7e192bcbe0514e41fcc55f
https://git.kernel.org/stable/c/b7368687e3d11f51392d3c4774ec0263d5fbf31f
https://git.kernel.org/stable/c/eff41f50461c238bd2c5cd20672a5b53e68d493a
https://git.kernel.org/stable/c/f5e245164d187d1ee227140c8b2e83b67f59c1fd

History

Wed, 16 Sep 2026 10:45:00 +0000

Type	Values Removed	Values Added
Description		In the Linux kernel, the following vulnerability has been resolved: scsi: qla2xxx: Fix FCE trace enable parsing in debugfs qla2x00_dfs_fce_write() called kstrtoul() with a NULL result pointer, so a successful parse would dereference NULL and oops. Worse, the int return value (0 on success, negative errno on failure) was assigned to the unsigned long enable flag, inverting the intended logic: a valid number was treated as "disable" while a parse failure enabled FCE. Parse the value into enable and propagate parse errors to userspace.
Title		scsi: qla2xxx: Fix FCE trace enable parsing in debugfs
First Time appeared		Linux Linux linux Kernel
CPEs		cpe:2.3:o:linux:linux_kernel::::::::
Vendors & Products		Linux Linux linux Kernel
References		https://git.kernel.org/stable/c/5762d992dddaf301e7fb78f797de407116847121 https://git.kernel.org/stable/c/7203d4aed8f444e7376c2dee8d93577b37cf9989 https://git.kernel.org/stable/c/9932cbd0b49d0a5ab8378d32650ffb51604ffa35 https://git.kernel.org/stable/c/aac0d3cb9199121d2ce5906e06f94b793fac1052 https://git.kernel.org/stable/c/b0c08c08a08b6cca0e7e192bcbe0514e41fcc55f https://git.kernel.org/stable/c/b7368687e3d11f51392d3c4774ec0263d5fbf31f https://git.kernel.org/stable/c/eff41f50461c238bd2c5cd20672a5b53e68d493a https://git.kernel.org/stable/c/f5e245164d187d1ee227140c8b2e83b67f59c1fd

Subscriptions

Linux Linux Kernel

MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2026-09-16T10:31:25.069Z

Updated: 2026-09-16T10:31:25.069Z

Reserved: 2026-09-11T19:38:34.770Z

Link: CVE-2026-89851

Vulnrichment

No data.

NVD

Status : Received

Published: 2026-09-16T11:16:52.757

Modified: 2026-09-16T11:16:52.757

Link: CVE-2026-89851

Redhat

No data.

OpenCVE Enrichment

Updated: 2026-09-19T13:45:15Z

Weaknesses

No weakness.

Impact

Affected Systems

Risk and Exploitability

Tracking

Subscriptions

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