CVE-2025-40202

Vulnerability

CVE-2025-40202 is a vulnerability in the Linux kernel's IPMI (Intelligent Platform Management Interface) driver. The issue stems from flawed handling of the user message limit, which could lead to improper counting of messages in some cases and, critically, a use-after-free condition [1][2].

Exploitation

To exploit this flaw, an attacker would need local access to the system and the ability to interact with the IPMI subsystem, sending messages to exhaust or manipulate the message limit counter. The use-after-free occurs when the message limit count is decremented incorrectly, allowing a freed memory region to be accessed [1].

Impact

A successful exploit could allow an attacker to cause a denial of service (system crash) or potentially escalate privileges, as use-after-free vulnerabilities often enable arbitrary code execution within the kernel context [1][2].

Mitigation

The fix restructures the message allocation routine to handle both reference counting and user message counts in a unified, safer way [1]. Users should apply the kernel patch from the stable repository to eliminate the risk.