CVE-2025-71312
MediumCVSS 5.5Exploitation Probability (EPSS)
Low risk4th percentile - higher than 4% of all known CVEs
Summary
In the Linux kernel, a memory leak of the ntfs_mount_options structure was found in the NTFS3 filesystem. The issue occurs in ntfs_fill_super() where the fc->fs_private pointer is set to NULL without freeing the allocated memory first, causing ntfs_fs_free() to skip deallocation.
Risk Assessment
The memory leak can gradually exhaust available system memory, especially when mounting NTFS3 partitions repeatedly, potentially leading to performance degradation or system failure.
Recommendation
Immediately update the Linux kernel to a version containing the fix that removes the unnecessary NULL assignment of fc->fs_private and uses put_mount_options() for proper cleanup of mount options.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: fix ntfs_mount_options leak in ntfs_fill_super() In ntfs_fill_super(), the fc->fs_private pointer is set to NULL without first freeing the memory it points to. This causes the subsequent call to ntfs_fs_free() to skip freeing the ntfs_mount_options structure. This results in a kmemleak report: unreferenced object 0xff1100015378b800 (size 32): comm "mount", pid 582, jiffies 4294890685 hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 ed ff ed ff 00 04 00 00 ................ backtrace (crc ed541d8c): __kmalloc_cache_noprof+0x424/0x5a0 __ntfs_init_fs_context+0x47/0x590 alloc_fs_context+0x5d8/0x960 __x64_sys_fsopen+0xb1/0x190 do_syscall_64+0x50/0x1f0 entry_SYSCALL_64_after_hwframe+0x76/0x7e This issue can be reproduced using the following commands: fallocate -l 100M test.file mount test.file /tmp/test Since sbi->options is duplicated from fc->fs_private and does not directly use the memory allocated for fs_private, it is unnecessary to set fc->fs_private to NULL. Additionally, this patch simplifies the code by utilizing the helper function put_mount_options() instead of open-coding the cleanup logic.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

