CVE-2014-2915 in Xen
Summary
by MITRE
Xen 4.4.x, when running on ARM systems, does not properly restrict access to hardware features, which allows local guest users to cause a denial of service (host or guest crash) via unspecified vectors, related to (1) cache control, (2) coprocessors, (3) debug registers, and (4) other unspecified registers.
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Analysis
by VulDB Data Team • 05/12/2026
The vulnerability identified as CVE-2014-2915 represents a critical access control flaw within the Xen hypervisor version 4.4.x when operating on ARM-based systems. This weakness stems from insufficient restrictions on hardware feature access, creating a pathway for malicious guest users to manipulate system resources in ways that can compromise both guest and host system stability. The vulnerability specifically targets the hypervisor's handling of privileged hardware components that should remain restricted to the hypervisor or host operating system. The flaw manifests through four primary attack vectors including cache control mechanisms, coprocessor operations, debug register manipulation, and additional unspecified register access points that collectively enable unauthorized access to system-level resources. The technical nature of this vulnerability aligns with CWE-284, which addresses improper access control in software systems, particularly in hypervisor environments where privilege separation is critical. This weakness exists at the intersection of virtualization security and ARM architecture-specific hardware control mechanisms, making it particularly dangerous in cloud computing and virtualized environments where multiple tenants share underlying hardware resources.
The operational impact of CVE-2014-2915 extends beyond simple denial of service conditions to potentially enable more sophisticated attacks that could compromise entire virtualized infrastructures. Local guest users with access to virtual machines running on affected Xen systems can exploit this vulnerability to crash either the guest operating system or the host hypervisor itself, creating cascading failures that affect all virtual machines hosted on the same physical system. This vulnerability particularly threatens cloud service providers and enterprise virtualization environments where multiple untrusted users share the same hypervisor infrastructure. The unspecified vectors within the cache control, coprocessor, debug registers, and other register categories suggest that attackers can leverage various hardware-level mechanisms to achieve their objectives. The ARM architecture-specific nature of this vulnerability means that systems running ARM processors with Xen hypervisor 4.4.x are particularly at risk, while x86 systems running the same hypervisor version are unaffected due to different privilege handling mechanisms. This vulnerability directly relates to the ATT&CK technique T1068, which involves exploiting local privileges to gain elevated access within a system.
Mitigation strategies for CVE-2014-2915 require immediate patching of affected Xen hypervisor installations to version 4.4.1 or later, which includes fixes specifically addressing the improper access control issues in ARM hardware feature handling. Organizations should implement comprehensive inventory management to identify all systems running affected Xen versions on ARM platforms and prioritize remediation efforts accordingly. The vulnerability demonstrates the importance of proper privilege separation in virtualization environments and highlights the need for regular security assessments of hypervisor configurations. System administrators should also consider implementing monitoring solutions that can detect unusual patterns of hardware register access or cache behavior that might indicate exploitation attempts. Additionally, organizations should review their virtualization security policies to ensure that guest users have appropriate access controls and that the principle of least privilege is maintained across all virtualized environments. The remediation process should include thorough testing of patched systems to ensure that the security fixes do not introduce compatibility issues with existing virtual machine configurations or guest operating systems. Regular security updates and vulnerability assessments should become standard practice for all virtualization infrastructure to prevent similar issues from arising in the future.