CVE-2024-42264 is a vulnerability identified and resolved in the Linux kernel, specifically within the Direct Rendering Manager (DRM) subsystem's v3d driver, which is responsible for managing 3D graphics on certain hardware platforms. The flaw pertains to the handling of performance query extensions, where the kernel did not properly validate the number of performance monitor (perfmon) userspace entries passed in the copy and reset operations. This lack of bounds checking could allow userspace applications to specify a number of perfmon entries exceeding the internal kernel storage allocated for these IDs. Consequently, this could lead to out-of-bounds memory access within the kernel space. Such memory access violations can cause kernel crashes (denial of service) or potentially be exploited to execute arbitrary code with kernel privileges, depending on the attacker's capabilities and system configuration. The vulnerability was addressed by adding proper validation to ensure that the number of perfmon entries does not exceed the kernel's internal storage limits, thereby preventing out-of-bounds access. The fix was cherry-picked from a specific commit (f32b5128d2c440368b5bf3a7a356823e235caabb) and published on August 17, 2024. No known exploits are currently reported in the wild, and no CVSS score has been assigned yet.

For European organizations, this vulnerability poses a risk primarily to systems running vulnerable Linux kernel versions with the affected DRM v3d driver enabled. Organizations relying on Linux servers, workstations, or embedded devices with this driver could face potential kernel crashes leading to denial of service, impacting availability of critical services. In worst-case scenarios, if exploited for arbitrary code execution, attackers could gain elevated privileges, compromising system confidentiality and integrity. This is particularly concerning for sectors with high reliance on Linux infrastructure such as finance, telecommunications, government, and critical infrastructure operators across Europe. The absence of known exploits reduces immediate risk, but the vulnerability's nature means that targeted attacks could emerge once exploit techniques are developed. Additionally, embedded devices and IoT systems using affected Linux kernels may be vulnerable, broadening the attack surface. The impact is heightened in environments where kernel stability and security are paramount, and where patch deployment cycles are slow or complex.

European organizations should promptly identify Linux systems running affected kernel versions with the DRM v3d driver enabled. Applying the official Linux kernel patches that address CVE-2024-42264 is the primary mitigation step. For systems where immediate patching is not feasible, organizations should consider disabling or restricting access to the performance query extensions or the v3d driver if not required, to reduce attack surface. Monitoring kernel logs for unusual perfmon activity or crashes can help detect attempted exploitation. Employing kernel hardening techniques such as Kernel Address Space Layout Randomization (KASLR), and enabling security modules like SELinux or AppArmor can provide additional layers of defense. Organizations should also ensure that userspace applications interacting with perfmon interfaces are trusted and regularly audited. Finally, maintaining an up-to-date inventory of Linux kernel versions and drivers in use will facilitate rapid response to similar vulnerabilities in the future.