CVE-2022-50732 in Linux
Summary
by MITRE • 12/24/2025
In the Linux kernel, the following vulnerability has been resolved:
staging: rtl8192u: Fix use after free in ieee80211_rx()
We cannot dereference the "skb" pointer after calling ieee80211_monitor_rx(), because it is a use after free.
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Analysis
by VulDB Data Team • 04/21/2026
The vulnerability CVE-2022-50732 represents a critical use-after-free condition in the Linux kernel's staging driver for rtl8192u wireless network adapters. This flaw exists within the ieee80211_rx() function where the system attempts to dereference a socket buffer pointer (skb) after invoking ieee80211_monitor_rx(), creating a scenario where memory that has already been freed is accessed. The issue stems from improper memory management practices in the wireless driver subsystem, specifically within the staging directory of the kernel source tree. Such vulnerabilities are particularly dangerous because they can lead to arbitrary code execution or system crashes when exploited by malicious actors. The rtl8192u driver handles IEEE 802.11 wireless networking protocols and is part of the Linux kernel's staging drivers that are often experimental or less rigorously tested than core kernel components.
The technical implementation of this vulnerability demonstrates a classic memory safety issue where the kernel's wireless subsystem fails to properly manage reference counts or buffer lifecycle management. When ieee80211_monitor_rx() is called, it likely frees the skb memory buffer or marks it as available for reuse, but the subsequent code continues to reference this same pointer without proper validation. This pattern violates fundamental memory safety principles and aligns with CWE-416, which specifically addresses use-after-free vulnerabilities where software continues to use a pointer after the memory it points to has been freed. The flaw operates at the kernel level, making it particularly severe as it can be exploited to gain elevated privileges or cause system instability. The staging driver context indicates this is part of a less mature codebase where security testing may be insufficient compared to core kernel components.
The operational impact of CVE-2022-50732 extends beyond simple system crashes to potentially enable privilege escalation attacks that could allow malicious users to execute arbitrary code with kernel-level privileges. Systems running affected kernel versions with rtl8192u wireless adapters are at risk, particularly those in enterprise environments where wireless network connectivity is essential. Attackers could exploit this vulnerability by crafting specific wireless frames that trigger the problematic code path, leading to memory corruption that might be leveraged for privilege escalation or denial of service. The vulnerability affects the broader Linux kernel ecosystem since it resides in a core networking subsystem that handles wireless frame processing, making it a potential vector for attackers to compromise network infrastructure or end-user devices. This type of vulnerability is particularly concerning for network security because it operates at the protocol level where network traffic is processed, potentially allowing attackers to manipulate wireless communication channels.
Mitigation strategies for CVE-2022-50732 focus on immediate kernel updates that contain the patched implementation of the ieee80211_rx() function. System administrators should prioritize applying security patches from their respective Linux distributions, as the fix involves correcting the memory management logic to prevent the use-after-free condition. The patch ensures that the skb pointer is either validated before reuse or that the function properly handles buffer lifecycle management after calling ieee80211_monitor_rx(). Organizations should also consider implementing network segmentation and monitoring to detect anomalous wireless traffic patterns that might indicate exploitation attempts. Additionally, disabling unused wireless drivers or interfaces when not required can reduce the attack surface. The vulnerability highlights the importance of proper memory management in kernel space and underscores the need for comprehensive security testing of staging drivers before they reach production environments. Security teams should monitor for indicators of compromise related to wireless network anomalies and maintain up-to-date kernel versions as recommended by their distribution vendors. This vulnerability serves as a reminder of the critical importance of memory safety in kernel development and the potential for seemingly minor code issues to result in severe security consequences.