Linux Kernel Vulnerability in F2FS Component Affecting Memory Management

CVE-2025-39731

What is CVE-2025-39731?

An identified flaw in the Linux kernel's file system implementation for F2FS may lead to improper handling of memory unmapping operations. This vulnerability arises when vm_unmap_ram() is invoked from an invalid context, particularly during error conditions when testing with UFS-backed virtual disks. The failure to check for interrupt disables can lead to unforeseen kernel behavior. The patch rectifies this issue by enhancing the in_task() check to consider interrupt status, thus ensuring that memory pages can be unmapped safely, minimizing potential disruptions during asynchronous operations.

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