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CVE-2025-40269 is a buffer overflow vulnerability in the Linux kernel ALSA USB-audio driver. PCM stream data is transferred through USB URB packet buffers whose sizes are calculated dynamically from the audio rate and packets per second (PPS). The vulnerable implementation does not adequately enforce endpoint packet-size limits, including those imposed by the wMaxPacketSize USB descriptor, allowing calculated packet sizes to exceed the PCM transfer buffer capacity. An unusual or malformed USB descriptor is considered a likely cause of this mismatch. The overflow can lead to information disclosure or denial of service.
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A buffer overflow in the Linux kernel's ALSA USB-audio driver occurs when dynamically calculated PCM transfer packet sizes exceed USB descriptor limits. The fix checks packet sizes during parameter setup and returns -EINVAL if they exceed maxpacksize. The reference assigns a CVSS v3 base score of 7.8 and recommends updating Echo's linux package and related packages to version 6.1.159-1 or later.
A buffer-overflow vulnerability in the Linux kernel ALSA USB audio driver that can lead to information disclosure and denial of service.
A Linux kernel ALSA USB audio driver buffer overflow vulnerability that can lead to information disclosure and denial of service.
A Linux kernel ALSA USB audio driver buffer overflow vulnerability that can cause information disclosure and denial of service.
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