CVE-2026-86845 in Red Hat
Summary
by MITRE • 10/15/2026
A flaw was found in DPDK lib/vhost vhost-crypto. Session cleanup can leave a stale cached session pointer, and the data path does not check the session type before attaching it, leading to use-after-free or type confusion in the host vhost-crypto backend.
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Analysis
by VulDB Data Team • 10/15/2026
The vulnerability identified within the Data Plane Development Kit (DPDK) specifically affects the lib/vhost component's crypto subsystem, presenting a critical risk to systems relying on hardware-accelerated cryptographic operations via virtualized environments. The core of this issue lies in the lifecycle management of session objects during cleanup procedures. When a vhost-crypto session is terminated or reset, the system fails to properly invalidate references held by other components, resulting in a stale cached pointer that continues to reference memory locations which may have been freed or repurposed for different functions. This architectural flaw creates a window where subsequent operations can interact with invalid memory structures, undermining the integrity and stability of the virtualization layer.
From a technical perspective, the vulnerability manifests through two primary failure modes: use-after-free and type confusion. The data path in the host vhost-crypto backend does not perform adequate validation checks on the session type before attempting to attach or utilize it. Consequently, if an attacker can influence the state of these sessions, they may trigger operations that assume a specific structure for cryptographic contexts while actually operating against a different or corrupted memory layout. This mismatch allows for arbitrary code execution possibilities, as the processor will interpret data according to the expected schema rather than the actual content, leading to potential privilege escalation within the host environment or denial of service through segmentation faults and system crashes.
The operational impact of this vulnerability is severe, particularly in cloud computing and virtualized infrastructure deployments where DPDK is commonly employed for high-performance packet processing. An attacker with access to the guest VM could potentially exploit this flaw to escape the sandboxed environment and execute code on the host machine. This represents a significant breach of isolation boundaries, compromising not only the affected instance but also other tenants sharing the same physical hardware resources. Furthermore, the instability introduced by use-after-free conditions can lead to unpredictable system behavior, causing service disruptions for critical applications that depend on consistent low-latency cryptographic processing capabilities provided by DPDK.
Mitigation strategies must address both immediate remediation and long-term architectural improvements. The primary defense is applying vendor-provided patches that update the lib/vhost library to include rigorous session state validation before attachment operations. Developers should ensure that all cached pointers are explicitly nullified upon session teardown to prevent stale references from being dereferenced. Additionally, implementing strict type checking mechanisms within the data path will mitigate risks associated with type confusion vulnerabilities. Organizations utilizing DPDK in production environments should prioritize updating their libraries and consider deploying runtime protection tools such as memory safety analyzers or sandboxing solutions that can detect anomalous behavior indicative of exploitation attempts related to heap corruption or invalid pointer dereferences.
This vulnerability aligns closely with Common Weakness Enumeration (CWE) identifiers, specifically CWE-416 which describes Use After Free conditions, and CWE-843 regarding Access of Resource Using Incompatible Type. These classifications highlight the fundamental errors in memory management logic that allow an attacker to manipulate program flow through corrupted data structures. Understanding these categories helps security teams categorize the risk accurately within their vulnerability management frameworks and prioritize remediation efforts based on established industry standards for software reliability and security.
In terms of adversarial tactics, this flaw can be leveraged as part of a broader attack chain consistent with MITRE ATT&CK techniques related to privilege escalation and defense evasion. By exploiting memory corruption issues in high-privilege processes like hypervisors or host-side virtualization daemons, an attacker may achieve initial access persistence or lateral movement within the network infrastructure. Security monitoring should focus on detecting unusual patterns of session creation and destruction that deviate from normal operational baselines, as such anomalies often precede exploitation attempts targeting memory management subsystems in high-performance networking stacks.