CVE-2024-53063: 
Linux Kernel vulnerability analysis and mitigation

CVE-2024-53063 is a vulnerability in the Linux kernel's DVB device driver subsystem, discovered and disclosed in November 2024. The issue affects the dvbdev component which contains a static variable used to store DVB minors, with behavior dependent on the CONFIGDVBDYNAMIC_MINORS configuration setting (NVD).

The vulnerability stems from insufficient boundary checking in the DVB device driver. When CONFIGDVBDYNAMICMINORS is not set, dvbregisterdevice() relies on a previous call to dvbregisteradapter() for boundary enforcement, while dvbdevice_open() assumes register functions have performed necessary checks. This implementation can be fragile if devices use different call patterns, potentially leading to out-of-memory access issues. The vulnerability has been assigned a CVSS v3.1 base score of 5.5 (Medium) with vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H (NVD).

The vulnerability could lead to out-of-memory access issues in the Linux kernel's DVB subsystem, potentially resulting in system crashes or denial of service conditions. The impact is limited to systems with DVB devices and requires local access to exploit (NVD).

The vulnerability has been patched in the Linux kernel with explicit guards added to prevent potential out-of-memory access risks. The fix includes additional boundary checks in both dvbregisterdevice() and dvbdeviceopen() functions (Kernel Patch).