CVE-2022-49035 is a vulnerability identified in the Linux kernel, specifically within the media subsystem's s5p_cec driver. The issue arises from the lack of enforcement of a maximum message length limit for CEC (Consumer Electronics Control) messages. CEC is a protocol used over HDMI connections to allow control of multiple devices through a single remote control. The vulnerability pertains to the s5p_cec driver not properly limiting the length of incoming CEC messages to the defined constant CEC_MAX_MSG_SIZE, which is typically 16 bytes. Although hardware implementations generally enforce this limit, the software driver did not, potentially allowing messages exceeding this size to be processed. This could lead to unexpected behavior such as buffer overflows or memory corruption within the kernel space. The vulnerability was addressed by adding a check to ensure that message lengths do not exceed the maximum allowed size, preventing potential exploitation. The affected versions are identified by a specific commit hash, indicating the vulnerability was present in certain Linux kernel builds prior to the patch. There are no known exploits in the wild, and no CVSS score has been assigned. The vulnerability does not require user interaction but does require the presence of the s5p_cec driver and the ability to send crafted CEC messages, which typically implies local or physical access to the HDMI interface or connected devices. The impact is primarily on system stability and security due to possible kernel memory corruption.

For European organizations, the impact of CVE-2022-49035 is generally limited but should not be dismissed. The vulnerability affects the Linux kernel's s5p_cec driver, which is used in devices that handle HDMI CEC communications, such as media centers, embedded systems, and certain consumer electronics running Linux. Organizations that deploy Linux-based media devices or embedded systems with HDMI interfaces could be at risk of kernel crashes or potential privilege escalation if an attacker can send maliciously crafted CEC messages. While remote exploitation is unlikely, environments where physical access to devices is possible (e.g., public kiosks, digital signage, or conference room equipment) could be vulnerable. The impact on confidentiality and integrity is moderate since kernel memory corruption could lead to privilege escalation or denial of service, but exploitation complexity and access requirements reduce the overall risk. For critical infrastructure or industrial control systems using affected hardware, the vulnerability could pose a higher risk due to potential disruption of services.

To mitigate this vulnerability, organizations should: 1) Apply the latest Linux kernel updates that include the patch limiting CEC message length to CEC_MAX_MSG_SIZE. 2) Audit and inventory devices running Linux kernels with the s5p_cec driver, particularly embedded and media devices with HDMI interfaces. 3) Restrict physical access to devices that could be targeted via HDMI CEC messages, especially in public or unsecured locations. 4) Monitor kernel logs for unusual behavior or crashes related to the s5p_cec driver. 5) Where feasible, disable the s5p_cec driver if HDMI CEC functionality is not required, reducing the attack surface. 6) Implement network segmentation and device hardening to limit exposure of vulnerable devices. These steps go beyond generic patching by emphasizing physical security and device-specific controls.