libavcodec/pthread_frame.c in FFmpeg before 5.1.2, as used in VLC and other products, leaves stale hwaccel state in worker threads, which allows attackers to trigger a use-after-free and execute arbitrary code in some circumstances (e.g., hardware re-initialization upon a mid-video SPS change when Direct3D11 is used).
It was discovered that FFmpeg incorrectly managed memory resulting in a memory leak. An attacker could possibly use this issue to cause a denial of service via application crash. This issue only affected Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. It was discovered that FFmpeg incorrectly handled certain input files, leading to an integer overflow. An attacker could possibly use this issue to cause a denial of service via application crash. This issue only affected Ubuntu 20.04 LTS.
