🚨High - ALSA Library Double-Free in parse_def() (CVE-2026-56109) The Advanced Linux Sound Architecture (ALSA) library contains a double-free in parse_def() in src/conf.c. When parsing nested compound or array configuration blocks, the function fails to check return values before continuing, so snd_config_delete() is called twice on the same already-freed node. By supplying maliciously crafted ALSA configuration text, an attacker can trigger a NULL-pointer write or invalid memory read, corrupting memory and crashing the affected process. The issue has a local attack vector with high availability impact. 👉Upgrade to alsa-lib 1.2.16.1.
Post summary
The post discloses that CVE‑2026‑56109 is a double‑free vulnerability in ALSA’s parse_def() and recommends upgrading to alsa‑lib 1.2.16.1, with no PoC, exploit code, or evidence of active attacks.