CVE-2023-1582

What it actually does

A race condition in fs/proc/task_mmu.c in the Linux kernel memory management allows a local user to interfere with task memory mappings and trigger a denial of service.

Why it matters to the business

Affected systems can experience crashes or service interruptions that halt media server operations and require restarts or recovery time.

How an attack unfolds

A local attacker with user privileges triggers concurrent operations on proc task structures to win a timing window that corrupts kernel state and causes a denial of service; no widespread exploitation or named threat actor activity has been observed.

How to fix it

Update mediabrowser/emby.releases to commit 667ccc535df36919536cb437dffa907487a603ca or later; apply any corresponding Linux kernel patches addressing the task_mmu race.

How to confirm the fix worked

Confirm the repository commit hash matches the fixed version and run stress tests exercising proc filesystem memory mapping operations to verify stability.

Typical attack path

1. Gain local user access on the host
2. Execute processes that concurrently access or modify task_mmu entries
3. Exploit the race window to induce kernel instability or panic

How to detect it

Search kernel logs and dmesg output for entries referencing task_mmu.c or proc filesystem races near the time of unexpected reboots or service failures.

What your security team should do

• Apply the listed commit update across all Emby deployments
• Limit local user accounts on hosts running the affected software
• Monitor kernel logs for task_mmu related warnings during routine operations