CVE-2024-53063

What it actually does

Missing explicit boundary checks on static dvb minor storage in dvb_register_device() and dvb_device_open() when CONFIG_DVB_DYNAMIC_MINORS is disabled allows potential out-of-bounds access or memory corruption due to reliance on prior adapter registration assumptions.

Why it matters to the business

Can cause kernel instability, crashes, or denial of service in DVB/media subsystems on Linux systems, disrupting broadcast, streaming, or media capture workloads with moderate operational risk given low exploit probability.

How an attack unfolds

An attacker would load or interact with a DVB device driver that bypasses normal registration paths, supplying out-of-range minor values to trigger the unchecked access and induce memory issues or crashes.

How to fix it

Update the Linux kernel to commit fedfde9deb83ac8d2f3d5f36f111023df34b1684 or later equivalent stable release that adds explicit guards in dvbdev; rebuild and reboot affected systems.

How to confirm the fix worked

Confirm kernel source contains the added boundary checks in dvb_register_device() and dvb_device_open(); verify CONFIG_DVB_DYNAMIC_MINORS behavior with test device registrations and run static analysis tools to ensure no out-of-bounds warnings remain.

Typical attack path

1. Identify or control a Linux system with DVB/media subsystem and CONFIG_DVB_DYNAMIC_MINORS disabled
2. Trigger dvb_register_device() or dvb_device_open() via crafted driver module or userspace interaction without prior adapter boundary enforcement
3. Supply invalid minor values leading to out-of-bounds access
4. Observe resulting kernel warnings, memory corruption, or denial of service

How to detect it

Review kernel logs for dvbdev-related out-of-bounds or warning messages during device registration; inspect dmesg and audit logs for unusual minor allocation attempts around DVB device load times.

What your security team should do

• Prioritize kernel upgrade to the fixed commit on all systems exposing DVB/media devices
• Audit kernel configs for CONFIG_DVB_DYNAMIC_MINORS and enable where possible
• Monitor for kernel oops or Coverity-style warnings related to dvbdev minors
• Test media workloads post-upgrade to confirm stability