CVE-2026-80695 Linux CVE debrief

Who should care

Linux kernel maintainers, Linux distribution maintainers, system administrators responsible for Linux kernel deployments, especially on architectures like ARMv5 or SPARC, should assess exposure and prioritize patching.

Why it matters

This vulnerability in the Linux kernel's hwmon subsystem can cause kernel panics on certain architectures. Linux kernel maintainers and users should assess exposure and prioritize patching to prevent potential issues.

• Potential for kernel panics on strict-alignment architectures.
• Need for patching to prevent exploitation.
• Importance of assessing exposure in Linux kernel deployments.
• Verification of patch status for affected systems.

Technical summary

The Linux kernel's hwmon subsystem, specifically the sht3x driver, is vulnerable to unaligned accesses. This can cause a kernel panic on strict-alignment architectures such as ARMv5 or SPARC. The issue arises from the use of be16_to_cpup() on stack-allocated byte arrays with unaligned offsets. The problem has been fixed by replacing be16_to_cpup() with get_unaligned_be16() and cpu_to_be16() with put_unaligned_be16().

Defensive priority

Linux kernel maintainers and users should assess exposure and prioritize patching to prevent potential kernel panics on architectures requiring strict alignment.

Recommended defensive actions

• Assess exposure of Linux kernel deployments to this vulnerability, particularly on architectures requiring strict alignment like ARMv5 or SPARC.
• Prioritize patching of affected Linux kernel versions to prevent potential kernel panics.
• Review system logs for indications of potential exploitation attempts or kernel panics related to this vulnerability.
• Update inventory of Linux kernel deployments to track patch status.
• Review compensating controls for exposed systems while remediation is scheduled and verified.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.

Evidence notes

The CVE record and associated source references provide details on the vulnerability and its resolution. However, specific exploitation details or victim information are not provided. The vulnerability was resolved by replacing be16_to_cpup() with get_unaligned_be16() and cpu_to_be16() with put_unaligned_be16(). Defenders should verify patch status for affected systems and review system logs for indications of potential exploitation attempts or kernel panics related to this vulnerability.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.