High [CVE-2026-64835] Arbitrary code execution, information disclosure, or denial of service via crafted ADX/AAX audio files

FFmpeg versions 4.4 through 8.1.2 contain an out-of-bounds memory access vulnerability in the ADX audio decoder within libavcodec/adxdec.c that allows attackers to trigger both out-of-bounds reads and writes by supplying a crafted ADX or AAX audio file with a mid-stream channel layout change.

When AV_PKT_DATA_NEW_EXTRADATA side data is received mid-stream, the adx_decode_frame function re-parses the stream header but fails to update the internal channel state, causing subsequent decoding operations to access the prev[] state array using a stale channel count. A flaw was found in FFmpeg.

This could lead to the attacker triggering both out-of-bounds reads and writes, potentially resulting in arbitrary code execution, information disclosure, or denial of service. Conditions for Exploitation: Successful exploitation requires user interaction or a specific application workflow.

An attacker cannot trigger this vulnerability entirely remotely on their own; they must supply a specially crafted ADX or AAX audio file and rely on a user or an automated media-processing system to actively parse it using the FFmpeg library.

Affected products named by the advisory: Red Hat Enterprise Linux AI 3.0 for RHEL 9; Red Hat Enterprise Linux AI 3.2 for RHEL 9; Red Hat Enterprise Linux AI 3.3 for RHEL 9; Red Hat AI Inference Server 3.2; and 3 more.