CVE-2026-48183 in Exynos 1480
Summary
by MITRE • 11/05/2026
Improper permission handling during buffer operations allows untrusted applications to create memory mappings with inappropriate permissions
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Analysis
by VulDB Data Team • 11/05/2026
The vulnerability described involves an improper implementation of access control mechanisms within the operating system's kernel, specifically concerning how file descriptors and memory mapping requests are validated before being processed. This flaw arises when the system fails to adequately verify that a requesting application possesses the necessary privileges or ownership rights for the target resource prior to granting it specific memory permissions such as read, write, or execute access. In modern computing environments, processes operate within isolated virtual address spaces, and the kernel acts as the trusted mediator between user-space applications and physical hardware resources. When this mediation process is compromised due to insufficient permission checks during buffer operations, an untrusted application can bypass standard security boundaries. This typically occurs in scenarios where a privileged service or daemon handles requests from lower-privilege processes without rigorously validating that the underlying file objects or memory regions are not owned by or accessible to unauthorized entities. The core technical failure lies in the logic governing mmap calls or similar system interfaces, where the kernel does not cross-reference the current process's effective user and group IDs against the ownership attributes of the target object with sufficient strictness.
From a technical perspective, this flaw allows an attacker to map memory regions that should be restricted into their own address space with elevated permissions. For instance, if a system component incorrectly handles buffer operations for files or devices owned by root or another privileged user, an unprivileged process might successfully request write access to those mapped pages. This effectively grants the malicious application the ability to modify data structures, configuration files, or even executable code segments that are critical to system integrity and security. The exploitation of this vulnerability does not require complex buffer overflow techniques; rather, it relies on a logical error in permission validation logic. By carefully crafting requests that exploit race conditions or misconfigured inheritance rules, an attacker can trick the kernel into treating untrusted input as trusted output. This is particularly dangerous because memory mapping operations are fundamental to how applications load libraries and manage dynamic data, making this flaw applicable across a wide range of software architectures including Linux, macOS, and potentially embedded systems that utilize similar POSIX-compliant interfaces.
The operational impact of such a vulnerability is severe, primarily revolving around privilege escalation and potential remote code execution. Once an untrusted application gains write access to privileged memory regions or files through improper mappings, it can alter system configurations, inject malicious payloads into running processes, or modify security-critical data structures like password hashes or authentication tokens. This leads directly to a complete compromise of the host's confidentiality, integrity, and availability. An attacker could use this capability to escalate their privileges from an unprivileged user account to root or SYSTEM level, thereby gaining full control over the affected system. Furthermore, if the vulnerable component is exposed via network services or inter-process communication channels accessible by remote attackers, the vulnerability can be exploited remotely without prior authentication. This transforms a local logic flaw into a critical security risk capable of compromising entire networks if not promptly addressed. The impact extends beyond immediate exploitation to long-term persistence, as modified system binaries or configurations could allow for recurring access even after initial patches are applied if residual artifacts remain in memory or on disk.
To mitigate this vulnerability, developers and system administrators must implement rigorous input validation and strict adherence to the principle of least privilege during all buffer operations involving memory mapping. The primary remediation involves updating affected software components to ensure that every request for memory permissions is accompanied by a comprehensive check against the requesting process's actual privileges relative to the target resource ownership. This includes verifying file descriptors, checking access control lists, and ensuring that capabilities are correctly inherited or dropped during privilege transitions. Security patches should enforce strict separation between user-space requests and kernel-space actions, utilizing mandatory access control systems such as SELinux or AppArmor to provide an additional layer of enforcement regardless of application-level logic errors. Additionally, enabling memory protection features like DEP (Data Execution Prevention) and ASLR (Address Space Layout Randomization) can mitigate the impact by making it harder for attackers to execute injected code even if they gain write access to certain regions. Regular security audits focusing on system call handlers and kernel modules responsible for resource management are essential to identify similar logical flaws before they can be exploited in production environments.