CVE-2025-22107 is a vulnerability identified in the Linux kernel's Distributed Switch Architecture (DSA) subsystem, specifically affecting the sja1105 driver. The issue arises in the function sja1105_table_delete_entry(), which handles deletion of entries from a table. The vulnerability involves an out-of-bounds memory access triggered during the deletion process. When deleting the last element in the table, the code incorrectly attempts to perform a memmove operation on elements beyond the valid range, accessing memory that lies outside the allocated bounds. The problem is twofold: first, deleting the last element does not require a memmove operation, yet the code attempts it, leading to out-of-bounds access; second, the memmove call itself is incorrectly sized, moving more elements than it should, which again results in accessing invalid memory. Although the out-of-bounds element remains out of active use after being accessed, the mere touching of this invalid memory can cause issues, particularly if the accessed memory resides on an unmapped page, potentially leading to kernel crashes or undefined behavior. This vulnerability is a form of memory safety error that could be exploited to cause denial of service or potentially escalate privileges if combined with other vulnerabilities. However, there are no known exploits in the wild at this time, and the vulnerability requires kernel-level access to trigger, limiting the attack surface. The affected versions are specific Linux kernel commits identified by their hashes, indicating this is a recent and targeted fix. No CVSS score has been assigned yet, and no patches or mitigation links are provided in the source information.

For European organizations, the impact of CVE-2025-22107 depends largely on their use of Linux systems running the affected kernel versions with the sja1105 DSA driver enabled. This driver is typically used in specialized networking hardware, such as automotive or industrial Ethernet switches, which may be part of critical infrastructure or enterprise network equipment. Exploitation could lead to kernel crashes causing denial of service, potentially disrupting network operations or critical services. In environments where Linux is used in embedded or industrial control systems, this could affect operational continuity. Although the vulnerability does not appear to allow direct privilege escalation or remote code execution on its own, the instability caused by out-of-bounds memory access could be leveraged in multi-stage attacks. European organizations with stringent uptime requirements, such as telecommunications providers, manufacturing plants, or automotive suppliers, may face operational risks. Additionally, any disruption in network infrastructure could have cascading effects on business processes and compliance with regulations like GDPR if service availability is impacted. Given the lack of known exploits, the immediate risk is moderate, but the potential for future exploitation warrants proactive mitigation.

To mitigate CVE-2025-22107, European organizations should: 1) Identify Linux systems running kernel versions that include the vulnerable sja1105 driver, especially those used in networking or embedded environments. 2) Apply the official Linux kernel patches that fix the out-of-bounds access as soon as they become available, or upgrade to a kernel version where this vulnerability is resolved. 3) For systems where immediate patching is not feasible, consider disabling the sja1105 DSA driver if it is not required, to eliminate the attack surface. 4) Implement kernel-level security hardening measures such as Kernel Address Sanitizer (KASAN) during testing phases to detect similar memory issues proactively. 5) Monitor system logs and kernel crash reports for signs of instability that could indicate exploitation attempts. 6) Employ network segmentation and strict access controls to limit kernel-level access to trusted administrators only, reducing the likelihood of exploitation. 7) Maintain an inventory of embedded devices and network equipment using the sja1105 driver to ensure timely updates and vulnerability management. These steps go beyond generic advice by focusing on the specific driver and kernel subsystem involved, emphasizing proactive detection and controlled exposure.