CVE-2026-23062

Summary

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

platform/x86: hp-bioscfg: Fix kernel panic in GET_INSTANCE_ID macro

The GET_INSTANCE_ID macro that caused a kernel panic when accessing sysfs attributes:

1. Off-by-one error: The loop condition used '<=' instead of '<', causing access beyond array bounds. Since array indices are 0-based and go from 0 to instances_count-1, the loop should use '<'.

2. Missing NULL check: The code dereferenced attr_name_kobj->name without checking if attr_name_kobj was NULL, causing a null pointer dereference in min_length_show() and other attribute show functions.

The panic occurred when fwupd tried to read BIOS configuration attributes:

Oops: general protection fault [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] RIP: 0010:min_length_show+0xcf/0x1d0 [hp_bioscfg]

Add a NULL check for attr_name_kobj before dereferencing and corrects the loop boundary to match the pattern used elsewhere in the driver.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/eb5ff1025c92117d5d1cc728bcfa294abe484da1
• https://git.kernel.org/stable/c/eba49c1dee9c5e514ca18e52c545bba524e8a045
• https://git.kernel.org/stable/c/193922a23d7294085a47d7719fdb7d66ad0a236f
• https://git.kernel.org/stable/c/25150715e0b049b99df664daf05dab12f41c3e13

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