Bug 2536406 (CVE-2026-90137)

Summary: CVE-2026-90137 kernel: platform/x86: hp-bioscfg: fix password encoding bounds check
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: akhatavk, aos-team-art-private, asdas, dpaolell, jdelft, jupierce, lgarciaa, mbiarnes, ppalepu, ppostler, prdhamdh, rhel-process-autobot, sghai, sidsharm, suppawar, vlaad, watson-tool-maintainers
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's hp-bioscfg component. The password encoding parser, specifically the PSWD_ENCODINGS parser, does not adequately validate the number of entries when processing an ACPI (Advanced Configuration and Power Interface) package. A malformed ACPI package can cause the parser to read beyond the intended memory boundaries. This out-of-bounds read could lead to information disclosure or a denial of service (DoS) on the affected system.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-09-17 17:44:51 UTC 
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].
Comment 1 Keith Grant 2026-09-23 15:41:11 UTC 
Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-90137.mbox