EUVD-2025-16701
CVSS Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
3Tags
Description
memory corruption while processing IOCTL commands, when the buffer in write loopback mode is accessed after being freed.
Analysis
Use-after-free memory corruption vulnerability in IOCTL command processing that occurs when buffers in write loopback mode are accessed after being freed. This local privilege escalation affects authenticated users (PR:L) on affected systems and can enable attackers to achieve confidentiality, integrity, and availability compromise (C:H/I:H/A:H). The vulnerability requires local access and low complexity exploitation, making it a significant risk for multi-user systems or systems where local code execution is possible.
Technical Context
This vulnerability is classified as CWE-416 (Use After Free), a memory safety issue where freed memory is dereferenced during IOCTL (Input/Output Control) command handling. The specific context involves write loopback mode operations, suggesting a device driver or kernel subsystem that manages buffered I/O operations. The use-after-free occurs in a code path where buffer lifecycle management is flawed—likely a buffer is freed prematurely or reference counting is incorrect, while subsequent IOCTL operations still attempt to access it. This pattern is common in device drivers for storage, network, or specialized hardware interfaces where loopback testing modes are implemented. The attack surface is limited to local authenticated users with appropriate privileges to issue IOCTL commands, but the memory corruption can lead to arbitrary code execution in kernel space depending on heap layout and exploitation technique.
Affected Products
Specific product and version information cannot be definitively extracted from the CVE description alone, as CPE strings and vendor advisory links were not provided in the input data. Based on the IOCTL and loopback mode context, likely affected categories include: (1) Linux kernel subsystems handling device I/O (block devices, network drivers, character devices with loopback modes); (2) Windows kernel drivers implementing loopback functionality; (3) Proprietary device drivers for storage controllers, network adapters, or specialized hardware. To obtain precise affected versions and CPE identifiers, consult: NIST NVD CVE-2025-27031 page, Red Hat Security Advisories (if Red Hat-related), Ubuntu USN bulletins, kernel.org security advisories, and vendor-specific security pages. Typical affected configuration would be: any system running a vulnerable driver version where authenticated users can issue IOCTL commands.
Remediation
Primary remediation is to apply the security patch released by the affected vendor. Without specific vendor references provided, follow these general steps: (1) Check vendor security advisories for CVE-2025-27031 patches and patch version numbers; (2) For Linux distributions, check package repositories for kernel or driver updates and apply via package manager (apt, yum, dnf, etc.); (3) For Windows, check Windows Update or vendor-specific driver update tools; (4) Test patches in non-production environments before broad deployment. Interim mitigations pending patch availability: (1) Restrict local user access to IOCTL-issuing mechanisms where possible; (2) Disable loopback mode functionality if not required; (3) Apply principle of least privilege to limit who can access affected driver interfaces; (4) Monitor for suspicious IOCTL activity in security logs. Workarounds are limited for use-after-free in kernel code; patching is the reliable solution.
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