Recursive Semaphore Deadlock in OCFS2 of Linux Kernel
CVE-2025-39885
What is CVE-2025-39885?
The vulnerability in the Linux kernel's OCFS2 filesystem involves a recursive semaphore deadlock triggered during the execution of the FS_IOC_FIEMAP command on a specially crafted mmap file. When an OCFS2 operation attempts to acquire a write lock while holding a read lock on the same semaphore, it leads to a system hang, impacting file system performance and stability. The issue has been identified and resolved by releasing the read semaphore before engaging in further processing, which mitigates the unnecessary locking mechanism. Addressing this vulnerability is crucial for maintaining overall system integrity and preventing potential disruptions.
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Affected Version(s)
Linux 00dc417fa3e763345b34ccb6034d72de76eea0a1 < 16e518ca84dfe860c20a62f3615e14e8af0ace57
Linux 00dc417fa3e763345b34ccb6034d72de76eea0a1 < 7e1514bd44ef68007703c752c99ff7319f35bce6
Linux 00dc417fa3e763345b34ccb6034d72de76eea0a1