Persona Adoption

Domain: Kernel Security Engineering & Vulnerability Analysis Persona: Senior Cybersecurity Vulnerability Researcher

Reviewer Recommendation

The appropriate groups to review this material are Kernel Maintainers, Platform Security Engineers, System Administrators managing HP-based infrastructure, and Maintainers of firmware update utilities (e.g., fwupd).

Abstract

CVE-2026-23062 documents a critical flaw in the Linux kernel's platform/x86: hp-bioscfg driver, specifically within the GET_INSTANCE_ID macro. The vulnerability stems from a combined off-by-one error during array indexing and a failure to validate null pointers before dereferencing attr_name_kobj->name. These defects trigger a general protection fault and subsequent kernel panic when the system attempts to access BIOS configuration attributes via sysfs, a process typically initiated by firmware update tools like fwupd. Remediation involved correcting loop boundaries and implementing mandatory NULL checks prior to attribute access.

Technical Summary of CVE-2026-23062

• [Description] Vulnerability Identification: A kernel panic occurs within the platform/x86: hp-bioscfg driver due to flaws in the GET_INSTANCE_ID macro.
• [Technical Detail] Off-by-One Error: The macro utilized a <= loop condition rather than <, resulting in an out-of-bounds access. Array indices in this driver are 0-based, spanning from 0 to instances_count-1.
• [Technical Detail] Null Pointer Dereference: The driver attempted to dereference attr_name_kobj->name without verifying the pointer’s validity. This lack of validation specifically caused panics in min_length_show() and related attribute display functions.
• [Operational Impact] Trigger Mechanism: The "Oops: general protection fault" is consistently triggered when the fwupd daemon attempts to read BIOS configuration attributes through the sysfs interface.
• [Diagnostic Data] KASAN Report: Kernel Address Sanitizer (KASAN) identified a null-ptr-deref in the range [0x0000000000000000-0x0000000000000007] at instruction RIP: 0010:min_length_show+0xcf/0x1d0.
• [Resolution] Remediation Strategy: The fix involves a code update to hp-bioscfg that enforces a NULL check for attr_name_kobj and aligns loop boundary logic with established driver patterns.
• [References] Patch Documentation: Stable kernel patches have been issued via kernel.org across four specific commits:
  • 193922a23d7294085a47d7719fdb7d66ad0a236f
  • 25150715e0b049b99df664daf05dab12f41c3e13
  • eb5ff1025c92117d5d1cc728bcfa294abe484da1
  • eba49c1dee9c5e514ca18e52c545bba524e8a045
• [Status] NVD Enrichment: As of February 2026, the record is "Awaiting Analysis" for CVSS scoring and vector string enrichment by NIST.