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Vulnerability Details CVE-2025-38058

In the Linux kernel, the following vulnerability has been resolved: __legitimize_mnt(): check for MNT_SYNC_UMOUNT should be under mount_lock ... or we risk stealing final mntput from sync umount - raising mnt_count after umount(2) has verified that victim is not busy, but before it has set MNT_SYNC_UMOUNT; in that case __legitimize_mnt() doesn't see that it's safe to quietly undo mnt_count increment and leaves dropping the reference to caller, where it'll be a full-blown mntput(). Check under mount_lock is needed; leaving the current one done before taking that makes no sense - it's nowhere near common enough to bother with.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 26.0%
CVSS Severity
CVSS v3 Score 5.5
Products affected by CVE-2025-38058


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