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Vulnerability DatabaseCVE-2025-40112
CVE-2025-40112:
Linux Debian vulnerability analysis and mitigation
Overview
CVE-2025-40112 is a vulnerability in the Linux kernel affecting the SPARC architecture, specifically related to exception reporting in copy_{from_to}_user functions for Niagara processors. The vulnerability was disclosed on November 12, 2025 (NVD).
Technical details
The vulnerability involves incorrect exception handling for user-space memory references in copy_from_user and copy_to_user functions. The issue stems from bad calculations and a broken epilogue in the exception handlers, which affects how remaining bytes are calculated using current register contents during memory operations (NVD).
Impact
This vulnerability can lead to system crashes and incorrect return values from copy_from_user and copy_to_user functions in fault scenarios. The behavior of memcpy remains unaffected by this issue (NVD).
Mitigation and workarounds
Multiple Linux distributions have released or are working on fixes. Debian has fixed the issue in version 6.1.158-1 for bookworm, 6.12.57-1 for trixie, and 6.17.8-1 for forky releases. Ubuntu has marked this vulnerability as medium priority and is actively working on updates for affected versions (Debian, Ubuntu).
Additional resources
Source: This report was generated using AI
Related Linux Debian vulnerabilities:
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