CVE-2023-52439

Summary

CVE-2023-52439 is a use-after-free vulnerability affecting the Linux kernel's uio subsystem (CVE-2023-52439: nuio: Fix use-after-free in uio_open). In the uio_unregister_device function, the device is deregistered, and its associated idev structure is freed. However, before the idev structure is freed, another core may obtain a reference to the same idev structure, leading to a use-after-free condition and potential double-free issue. This vulnerability poses a risk for memory corruption and potential system instability. To mitigate this issue, developers can implement a minor_lock to ensure atomicity and proper reference management during idev deregistration and release processes.

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