CVE-2025-38058 (GCVE-0-2025-38058)
Vulnerability from cvelistv5
Published
2025-06-18 09:33
Modified
2026-08-05 11:59
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 48a066e72d970a3e225a9c18690d570c736fc455
Version: 48a066e72d970a3e225a9c18690d570c736fc455
Version: 48a066e72d970a3e225a9c18690d570c736fc455
Version: 48a066e72d970a3e225a9c18690d570c736fc455
Version: 48a066e72d970a3e225a9c18690d570c736fc455
Version: 48a066e72d970a3e225a9c18690d570c736fc455
Version: 48a066e72d970a3e225a9c18690d570c736fc455
Version: 48a066e72d970a3e225a9c18690d570c736fc455
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              "value": "AV:L - The race is driven entirely through local syscalls \u2014 `umount(2)` on one thread and ordinary path lookups (`stat`/`open`/`openat`) on another. No network or physical access is involved.\nAC:L - The attacker controls both sides of the race: a private mount namespace lets them loop `umount()` on their own mount while sibling threads loop RCU path walks over it, so the narrow window between `propagate_mount_busy()` and the `MNT_SYNC_UMOUNT` store can be retried indefinitely on any SMP system (the default configuration).\nPR:L - `can_umount()`/`may_mount()` only require `CAP_SYS_ADMIN` in the user namespace owning the mount namespace, which any unprivileged user obtains via `unshare -Urm`; the path-walk half of the race requires no privileges whatsoever.\nUI:N - The attacker performs both the umount and the concurrent path lookups from its own threads; no victim action or cooperation is needed.\nS:U - The corruption is confined to VFS mount/superblock objects inside the kernel\u0027s own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - This is a use-after-free-class refcount race on `struct mount` \u2014 the same defect family whose failure mode in `__legitimize_mnt()` was previously \"use-after-free galore\" \u2014 and control over freed/reused mount and superblock objects yields an arbitrary kernel read primitive.\nI:H - A stolen final `mntput()` drives `cleanup_mnt()`/`deactivate_super()` and `mnt_instance`/`mnt_mounts` list surgery outside the RCU-grace-period ordering the sync-umount path establishes, giving heap-spray and list-corruption write primitives usable for control-flow hijack.\nA:H - The stolen reference produces refcount-imbalance `WARN_ON`s, mount/superblock teardown at an arbitrary later time after `umount(2)` reported success, and use-after-free oopses that panic the kernel."
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    "datePublished": "2025-06-18T09:33:38.022Z",
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    "dateUpdated": "2026-08-05T11:59:08.465Z",
    "state": "PUBLISHED"
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