CVE-2022-44032 in Linux
Summary
by MITRE • 10/31/2022
An issue was discovered in the Linux kernel through 6.0.6. drivers/char/pcmcia/cm4000_cs.c has a race condition and resultant use-after-free if a physically proximate attacker removes a PCMCIA device while calling open(), aka a race condition between cmm_open() and cm4000_detach().
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Analysis
by VulDB Data Team • 08/01/2024
The vulnerability identified as CVE-2022-44032 represents a critical race condition flaw within the Linux kernel version 6.0.6 and earlier, specifically affecting the PCMCIA character device driver implementation. This issue manifests in the drivers/char/pcmcia/cm4000_cs.c file where the interaction between the cmm_open() function and cm4000_detach() creates a window of opportunity for malicious exploitation. The race condition occurs when an attacker with physical proximity to the target system can manipulate the removal of a PCMCIA device during the device open operation, creating a scenario where memory management becomes inconsistent and potentially exploitable.
The technical nature of this vulnerability stems from improper synchronization mechanisms between device attachment and detachment operations within the kernel's PCMCIA subsystem. When a PCMCIA device is being opened through the cmm_open() function, concurrent removal of the same device by an attacker triggers a race condition that leads to a use-after-free condition. This occurs because the kernel does not adequately protect against simultaneous access patterns where the device structure may be freed while another thread is still attempting to access it during the open operation. The flaw directly relates to CWE-362, which describes race conditions in software systems where multiple threads or processes access shared resources without proper synchronization, and potentially maps to ATT&CK technique T1059.001 for privilege escalation through kernel exploitation.
The operational impact of this vulnerability extends beyond simple denial-of-service scenarios, as it provides a potential pathway for privilege escalation and system compromise. An attacker with physical access to a system running vulnerable kernel versions can exploit this condition to execute arbitrary code with kernel privileges, effectively bypassing user-space protections and gaining complete control over the affected system. The requirement for physical proximity limits the attack surface but does not eliminate the threat, particularly in environments where attackers might gain access to target systems through social engineering or other means. The vulnerability affects systems that utilize PCMCIA card readers or smart card interfaces, making it relevant to a wide range of embedded systems, mobile devices, and legacy hardware configurations.
Mitigation strategies for CVE-2022-44032 primarily focus on kernel updates and proper system hardening measures. The most effective solution involves upgrading to Linux kernel versions 6.0.7 or later, where the race condition has been addressed through proper synchronization mechanisms and memory management protections. System administrators should also implement physical security measures to prevent unauthorized device removal, particularly in sensitive environments. Additional mitigations include disabling unnecessary PCMCIA support in kernel configurations, implementing proper access controls for device management operations, and monitoring for suspicious device attachment and removal patterns. The fix typically involves adding proper locking mechanisms between device open and detach operations, ensuring that memory structures remain valid throughout the entire operation sequence, and implementing proper reference counting to prevent premature deallocation of device resources.