CVE-2022-49178 in Linux
Summary
by MITRE • 02/26/2025
In the Linux kernel, the following vulnerability has been resolved:
memstick/mspro_block: fix handling of read-only devices
Use set_disk_ro to propagate the read-only state to the block layer instead of checking for it in ->open and leaking a reference in case of a read-only device.
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Analysis
by VulDB Data Team • 03/12/2025
The vulnerability identified as CVE-2022-49178 resides within the Linux kernel's memstick subsystem, specifically affecting the mspro_block driver component that manages memory stick pro devices. This flaw represents a critical issue in device state management and resource handling that could potentially compromise system integrity and stability. The vulnerability manifests in how the driver handles read-only memory stick devices, creating a scenario where proper device state propagation fails to occur within the block layer subsystem.
The technical flaw stems from an improper implementation of read-only device handling within the memstick/mspro_block driver. Rather than utilizing the established kernel mechanism set_disk_ro to properly communicate the read-only status to the block layer, the driver employs an incorrect approach that checks for read-only conditions during the open operation. This methodological error creates a reference leak when encountering read-only devices, as the driver fails to properly release resources associated with the device handle. The flaw operates at the intersection of device driver architecture and kernel memory management, specifically within the block layer's device state propagation mechanisms.
The operational impact of this vulnerability extends beyond simple resource leakage to potentially affect system stability and security posture. When read-only devices are accessed, the improper handling can lead to memory leaks that accumulate over time, potentially causing system resource exhaustion. Additionally, the failure to properly propagate read-only state information to the block layer may result in inconsistent device behavior where applications might attempt write operations on devices that should be read-only, leading to potential data corruption or system instability. This vulnerability aligns with CWE-404, which addresses improper resource release or unbalanced resource management, and could potentially be exploited through resource exhaustion attacks or by causing system instability.
The mitigation strategy for this vulnerability involves updating the Linux kernel to a patched version that properly implements the set_disk_ro function for read-only device state propagation. System administrators should prioritize applying kernel updates that include this fix, particularly in environments where memory stick devices are actively used. The fix ensures that read-only status information is correctly communicated throughout the kernel's block layer subsystem, preventing both the reference leak and maintaining proper device state consistency. Security monitoring should focus on identifying any unusual memory consumption patterns or device access anomalies that might indicate exploitation attempts. This vulnerability demonstrates the importance of proper kernel driver state management and adheres to ATT&CK technique T1068 by potentially enabling privilege escalation through resource exhaustion or system instability. Organizations should implement comprehensive kernel patch management processes to ensure all systems receive timely updates addressing such foundational security flaws.