Loop Device Block Size Vulnerability in Linux Kernel by Linux Foundation
CVE-2025-38709
What is CVE-2025-38709?
A vulnerability in the Linux kernel affects loop devices, where changing the block size underneath a mounted filesystem can lead to inconsistencies. This mismatch between the loop device's block size and the superblock's recorded size creates potential instability in file system operations. The issue arises when the system attempts to perform actions that depend on a consistent block size, resulting in errors and warnings that may impact data integrity. The vulnerability is addressed by ensuring exclusive access to the loop device before making block size changes, which prevents conflicts with filesystem ownership.
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Affected Version(s)
Linux 89e4fdecb51cf5535867026274bc97de9480ade5 < 457d2c5e112fd08dc1039b1ae39a83ec1782360d
Linux 89e4fdecb51cf5535867026274bc97de9480ade5 < 139a000d20f2f38ce34296feddd641d730fe1c08
Linux 89e4fdecb51cf5535867026274bc97de9480ade5