Out-of-Bounds Write Vulnerability in Linux Kernel Affects Cache Information Management

CVE-2025-21785

What is CVE-2025-21785?

CVE-2025-21785 is a vulnerability found in the Linux kernel, specifically related to cache information management. The vulnerability arises from an out-of-bounds write condition that can occur when handling cache level data. It potentially allows malicious actors to manipulate memory more than intended, which could disrupt system integrity and lead to unintended behavior. Organizations utilizing Linux-based systems are at risk, as this flaw could compromise critical functions within their infrastructure, affecting performance and security.

Technical Details

The vulnerability is caused by a flaw in the code handling the detection and population of cache information within the Linux kernel. While there is a bounds check on the array size in the loop, it fails to consider cache levels with separate data and instruction caches. This oversight could result in writing data beyond the allocated buffer, leading to instability or unauthorized access to sensitive areas of the memory.

Potential Impact of CVE-2025-21785

1. System Instability: The out-of-bounds write could lead to crashes or erratic behavior of the affected systems, causing downtime and affecting service availability.

2. Memory Manipulation: Exploitation could allow attackers to overwrite memory, which might lead to unauthorized code execution or other malicious activities on the system.

3. Compromised Data Integrity: The vulnerability poses a risk of corrupted cache information, potentially leading to inaccurate data processing and operational failures within applications reliant on robust memory management.

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