CVE-2023-3269 in Linux (StackRot)
Summary
by MITRE • 07/11/2023
A vulnerability exists in the memory management subsystem of the Linux kernel. The lock handling for accessing and updating virtual memory areas (VMAs) is incorrect, leading to use-after-free problems. This issue can be successfully exploited to execute arbitrary kernel code, escalate containers, and gain root privileges.
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Analysis
by VulDB Data Team • 07/23/2023
This vulnerability resides within the Linux kernel's memory management subsystem and represents a critical flaw that undermines the fundamental security guarantees of the operating system. The issue stems from improper lock handling mechanisms that govern access to virtual memory areas, creating a race condition that allows malicious actors to manipulate memory structures in ways that were not intended by the kernel's design. The vulnerability specifically affects how the kernel manages concurrent access to virtual memory area structures, where the absence of proper synchronization primitives enables attackers to exploit timing windows that lead to memory corruption. This flaw operates at the kernel level and presents a severe threat to system integrity since it directly impacts the memory management unit's ability to maintain consistent state during concurrent operations.
The technical implementation of this vulnerability manifests as a use-after-free condition that occurs when the kernel attempts to access memory that has already been freed but not properly deallocated. This improper memory management creates opportunities for attackers to manipulate the kernel's virtual memory management structures, potentially allowing them to overwrite critical data structures or execute arbitrary code with kernel privileges. The flaw is particularly dangerous because it operates within the kernel's core memory management functions, where the attacker's code can leverage the elevated privileges to gain complete control over the system. The race condition aspect of the vulnerability means that the exploitation requires precise timing and specific conditions to be met, but once achieved, it provides a direct path to privilege escalation from user-level processes to root access.
The operational impact of CVE-2023-3269 extends far beyond simple privilege escalation, as it enables attackers to achieve complete system compromise and can be leveraged to escalate containerized applications to host-level privileges. This vulnerability directly violates the principle of least privilege and undermines the security boundaries that separate different execution contexts within the Linux ecosystem. The implications for containerized environments are particularly severe since attackers can exploit this vulnerability to escape container isolation and gain root access to the underlying host system, potentially compromising entire infrastructure deployments. Organizations running Linux-based systems are at significant risk, as this vulnerability can be exploited remotely through various attack vectors that leverage kernel memory management functions, and the exploitation does not require any special privileges or capabilities beyond standard user access.
Mitigation strategies for this vulnerability must focus on immediate patching of affected kernel versions, as this represents a critical security flaw that should be addressed with the highest priority. System administrators should implement comprehensive monitoring for suspicious kernel memory access patterns and potential exploitation attempts, particularly focusing on processes that interact with virtual memory management APIs. The vulnerability aligns with CWE-415 which addresses double free errors and CWE-416 which covers use-after-free conditions, both of which are fundamental memory safety issues that require robust defensive programming practices. Organizations should also consider implementing kernel lockdown mechanisms and enhanced memory protection features that can detect and prevent exploitation attempts, while the ATT&CK framework categorizes this vulnerability under privilege escalation techniques that leverage kernel memory corruption, emphasizing the need for layered security approaches that include both preventive measures and detection capabilities to protect against such critical exploits.