CVE-2022-1050 in QEMU
Summary
by MITRE • 03/29/2022
Guest driver might execute HW commands when shared buffers are not yet allocated, potentially leading to a use-after-free condition.
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Analysis
by VulDB Data Team • 04/03/2026
The vulnerability identified as CVE-2022-1050 represents a critical security flaw within virtualization environments where guest drivers interact with hypervisor-managed hardware resources. This issue manifests when guest drivers attempt to execute hardware commands before shared memory buffers have been properly allocated, creating a temporal window where system resources may be improperly accessed. The fundamental problem arises from a race condition between buffer allocation and command execution phases, where the hypervisor fails to adequately validate buffer state before allowing hardware operations to proceed. Such conditions are particularly dangerous in virtualized environments where multiple guest operating systems share underlying physical hardware resources, as they can potentially be exploited to compromise the integrity of the entire virtualization infrastructure.
The technical implementation of this vulnerability stems from insufficient input validation and resource management within the hypervisor's guest driver interface. When a guest driver issues hardware commands without proper synchronization checks, it may reference memory locations that have been deallocated or are in an inconsistent state. This use-after-free condition occurs because the hypervisor's memory management subsystem does not enforce proper buffer lifecycle validation before hardware command execution. The flaw specifically affects shared memory buffer allocation mechanisms where the hypervisor fails to maintain consistent state information between the buffer allocation phase and subsequent command execution phase. This vulnerability is categorized under CWE-416 which describes the use of freed memory condition, and it directly relates to improper resource management in virtualized environments.
The operational impact of CVE-2022-1050 extends beyond simple memory corruption, potentially enabling privilege escalation and arbitrary code execution within the virtualized environment. Attackers can exploit this vulnerability to gain elevated privileges within guest operating systems or even compromise the host hypervisor itself, depending on the virtualization architecture in use. The vulnerability affects systems using virtualization technologies such as VMware, KVM, and Hyper-V where guest drivers interact with shared memory buffers for hardware command execution. The attack surface is particularly broad since it affects multiple virtualization platforms and can be leveraged to bypass security controls implemented at the guest operating system level. This weakness can be exploited through carefully crafted guest driver operations that manipulate buffer allocation timing to trigger the use-after-free condition, potentially leading to complete system compromise.
Mitigation strategies for CVE-2022-1050 require both immediate patching and architectural improvements to prevent similar vulnerabilities from occurring. Organizations should prioritize applying vendor-specific patches that address the buffer allocation timing issues and implement proper synchronization mechanisms before hardware command execution. The hypervisor implementation should enforce strict buffer state validation before allowing guest drivers to execute hardware commands, utilizing mechanisms such as reference counting and proper memory lifecycle management. Additionally, implementing runtime monitoring and anomaly detection systems can help identify potential exploitation attempts by monitoring for unusual buffer allocation patterns and command execution sequences. Security controls should also include regular vulnerability assessments of virtualization environments and implementation of least privilege principles for guest drivers to minimize potential impact. The ATT&CK framework categorizes this vulnerability under privilege escalation and defense evasion techniques, emphasizing the need for comprehensive monitoring and access control measures. Organizations should also consider implementing hypervisor hardening measures and maintaining detailed logging of buffer allocation and command execution events to facilitate forensic analysis and incident response activities.