CVE-2023-54084

Vulnerability

Overview

In the Linux kernel's ALSA firewire-digi00x driver, a flaw exists in the error handling of the stream initialization code. When init_stream() fails, the driver incorrectly frees dg00x->rx_stream and returns success instead of an error code [1]. This oversight means that subsequent operations may access the freed memory, leading to a use-after-free condition.

Exploitation

The vulnerability can be triggered by an attacker who can cause init_stream() to fail, for example by manipulating the audio hardware or system resources. No special privileges are required if the attacker has local access to the system and can interact with the firewire device. The attack surface is limited to systems with the Digi 00x FireWire audio interface connected.

Impact

A successful exploitation could allow an attacker to execute arbitrary code, cause a denial of service (system crash), or leak sensitive kernel memory. The use-after-free can corrupt kernel structures, leading to unpredictable behavior.

Mitigation

The issue is fixed in the Linux kernel by commits [1] and [2], which ensure that an error code is properly returned after freeing resources. Users should update to the latest stable kernel version to mitigate this vulnerability.