CVE-2026-90137 - Vulnerability Details

- platform/x86: hp-bioscfg: fix password encoding bounds check

Description

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

platform/x86: hp-bioscfg: fix password encoding bounds check

The password PSWD_ENCODINGS parser reads password_obj[elem + pos_values]
while copying the supported password encodings from the ACPI package.

The outer loop only guarantees that elem is within password_obj_count.
The encoding count is bounded by MAX_ENCODINGS_SIZE, but that does not
guarantee that the ACPI package contains enough entries for all
elem + pos_values accesses.

A malformed package can therefore declare a non-zero encoding count
without providing enough string objects, causing the parser to read past
the ACPI package array and pass an out-of-bounds string pointer and
length to hp_convert_hexstr_to_str().

Add the same computed-index bounds check used by the other offset-based
package parsing loops before reading password_obj[elem + pos_values].

Published: 2026-09-17

Score: 7.7 High

EPSS: < 1% Very Low

KEV: No

Impact:

Action:

Analysis

Impact

The vulnerability resides in the Linux kernel’s HP BIOS configuration parser, where a missing bounds check allows a malformed ACPI package to trigger an out‑of‑bounds read of password encoding strings. This can lead to kernel memory corruption and, under the right conditions, arbitrary code execution or privilege escalation. The weakness is characterized by improper input validation and buffer over‑read conditions.

Affected Systems

Any Linux kernel installation that includes the hp-bioscfg module. No specific version was recorded, so the flaw is potentially present in all current kernels until the associated patch is applied.

Risk and Exploitability

The EPSS score is reported as <1%, indicating a low probability of exploitation in the wild. However, the flaw is not listed in the CISA KEV catalog. The exploit path requires delivery of a crafted ACPI package, which could be embedded in firmware updates or supplied via malicious firmware. The CVSS score of 7.7 indicates high severity, making the potential impact significant should the flaw be successfully leveraged.

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
`8646a3b5ee3a5b384a22a721f37c24274d974045`	affected	< c224759555a13735b0d67561d818cefe00c3309a
`8646a3b5ee3a5b384a22a721f37c24274d974045`	affected	< 59fe8491ddaa03a510b352552e6ee291e7ce45d3
`8646a3b5ee3a5b384a22a721f37c24274d974045`	affected	< ace1ba5fca0ab775b3641e154bcbc3ccde26a71a
`8646a3b5ee3a5b384a22a721f37c24274d974045`	affected	< 8a7499b8fd34438c1b11964e0e7ef5bd590fec92
`8646a3b5ee3a5b384a22a721f37c24274d974045`	affected	< e213939ed9e6e6badf7aa48c4c8dd9a9cdf00615

Linux

affected

Version	Status	Constraints
`6.6`	affected	—
`0`	unaffected	< 6.6
`6.6.157`	unaffected	≤ 6.6.*
`6.12.110`	unaffected	≤ 6.12.*
`6.18.52`	unaffected	≤ 6.18.*
`7.2.6`	unaffected	≤ 7.2.*
`7.3-rc1`	unaffected	≤ *

No data.

Vendor Product Confidence Versions

Linux

Linux Kernel

99%

Version	Status	Scheme	Platform
`[8646a3b5ee3a5b384a22a721f37c24274d974045,c224759555a13735b0d67561d818cefe00c3309a)`	affected	code_commit	—
`[8646a3b5ee3a5b384a22a721f37c24274d974045,59fe8491ddaa03a510b352552e6ee291e7ce45d3)`	affected	code_commit	—
`[8646a3b5ee3a5b384a22a721f37c24274d974045,ace1ba5fca0ab775b3641e154bcbc3ccde26a71a)`	affected	code_commit	—
`[8646a3b5ee3a5b384a22a721f37c24274d974045,8a7499b8fd34438c1b11964e0e7ef5bd590fec92)`	affected	code_commit	—
`[8646a3b5ee3a5b384a22a721f37c24274d974045,e213939ed9e6e6badf7aa48c4c8dd9a9cdf00615)`	affected	code_commit	—

Linux

Linux Kernel

99%

Version	Status	Scheme	Platform
`6.6`	affected	generic	—
`[0,6.6)`	unaffected	generic	—
`[6.6.157,6.7.0)`	unaffected	semver	—
`[6.12.110,6.13.0)`	unaffected	semver	—
`[6.18.52,6.19.0)`	unaffected	semver	—
`[7.2.6,7.3.0)`	unaffected	semver	—
`[7.3-rc1,*]`	unaffected	generic	—

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Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

Upgrade the Linux kernel to a version that includes the patch identified by commit 59fe8491ddaa.
If an upgrade is not immediately possible, disable the hp-bioscfg subsystem or unload the module to prevent the vulnerable parser from executing.
Ensure that BIOS/firmware updates are signed and verified; replace any firmware that may contain malformed ACPI packages with a trusted, patched version.

Generated by OpenCVE AI on September 20, 2026 at 04:22 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

Attack Vector Local

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.0019.

Key SSVC decision points have not yet been added.

References

Link	Providers
https://git.kernel.org/stable/c/59fe8491ddaa03a510b352552e6ee291e7ce45d3
https://git.kernel.org/stable/c/8a7499b8fd34438c1b11964e0e7ef5bd590fec92
https://git.kernel.org/stable/c/ace1ba5fca0ab775b3641e154bcbc3ccde26a71a
https://git.kernel.org/stable/c/c224759555a13735b0d67561d818cefe00c3309a
https://git.kernel.org/stable/c/e213939ed9e6e6badf7aa48c4c8dd9a9cdf00615

History

Sun, 20 Sep 2026 04:45:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-129 CWE-20

Sun, 20 Sep 2026 03:30:00 +0000

Type	Values Removed	Values Added
Weaknesses	CWE-119 CWE-125

Fri, 18 Sep 2026 23:45:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-119 CWE-125

Fri, 18 Sep 2026 21:30:00 +0000

Type	Values Removed	Values Added
Metrics		cvssV3_1 `{'score': 7.7, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H'}`

Thu, 17 Sep 2026 16:30:00 +0000

Type	Values Removed	Values Added
Description		In the Linux kernel, the following vulnerability has been resolved: platform/x86: hp-bioscfg: fix password encoding bounds check The password PSWD_ENCODINGS parser reads password_obj[elem + pos_values] while copying the supported password encodings from the ACPI package. The outer loop only guarantees that elem is within password_obj_count. The encoding count is bounded by MAX_ENCODINGS_SIZE, but that does not guarantee that the ACPI package contains enough entries for all elem + pos_values accesses. A malformed package can therefore declare a non-zero encoding count without providing enough string objects, causing the parser to read past the ACPI package array and pass an out-of-bounds string pointer and length to hp_convert_hexstr_to_str(). Add the same computed-index bounds check used by the other offset-based package parsing loops before reading password_obj[elem + pos_values].
Title		platform/x86: hp-bioscfg: fix password encoding bounds check
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/59fe8491ddaa03a510b352552e6ee291e7ce45d3 https://git.kernel.org/stable/c/8a7499b8fd34438c1b11964e0e7ef5bd590fec92 https://git.kernel.org/stable/c/ace1ba5fca0ab775b3641e154bcbc3ccde26a71a https://git.kernel.org/stable/c/c224759555a13735b0d67561d818cefe00c3309a https://git.kernel.org/stable/c/e213939ed9e6e6badf7aa48c4c8dd9a9cdf00615

Subscriptions

Linux Linux Kernel

MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2026-09-17T16:06:35.829Z

Updated: 2026-09-18T17:53:17.115Z

Reserved: 2026-09-11T19:38:34.788Z

Link: CVE-2026-90137

Vulnrichment

No data.

NVD

Status : Received

Published: 2026-09-17T17:17:06.287

Modified: 2026-09-18T18:17:43.270

Link: CVE-2026-90137

Redhat

No data.

OpenCVE Enrichment

Updated: 2026-09-20T04:30:18Z

Weaknesses

CWE-129
Improper Validation of Array Index
CWE-20
Improper Input Validation

Impact

Affected Systems

Risk and Exploitability

Tracking

Attack Vector Local

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact None

Availability Impact High

User Interaction None

Subscriptions

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