Memory Error Handling Vulnerability in Linux Kernel Affecting Various Versions

CVE-2025-39989

Summary

A significant issue in the Linux kernel has been identified where improper error handling during memory operations can lead to kernel panics or user process terminations. Specifically affecting versions beyond 5.17, this vulnerability arises during the handling of memory errors in copy-from-user operations, which can result in a critical failure scenario. The failure occurs due to a race condition between memory controller signals and kernel operations, causing unhandled memory errors that lead to system instability. A recent patch aims to rectify these issues by restoring effective error recovery methods, ensuring that the system can handle these memory failures without crashing.

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