__legitimize_mnt(): check for MNT_SYNC_UMOUNT should be under mount_lock

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Summary

CVECVE-2025-38058
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-06-18 10:15:38 UTC
Updated2026-05-12 13:16:41 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-667

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 48a066e72d970a3e225a9c18690d570c736fc455 628fb00195ce21a90cf9e4e3d105cd9e58f77b40 git Not specified
CNA Linux Linux affected 48a066e72d970a3e225a9c18690d570c736fc455 b89eb56a378b7b2c1176787fc228d0a57172bdd5 git Not specified
CNA Linux Linux affected 48a066e72d970a3e225a9c18690d570c736fc455 f6d45fd92f62845cbd1eb5128fd8f0ed7d0c5a42 git Not specified
CNA Linux Linux affected 48a066e72d970a3e225a9c18690d570c736fc455 9b0915e72b3cf52474dcee0b24a2f99d93e604a3 git Not specified
CNA Linux Linux affected 48a066e72d970a3e225a9c18690d570c736fc455 d8ece4ced3b051e656c77180df2e69e19e24edc1 git Not specified
CNA Linux Linux affected 48a066e72d970a3e225a9c18690d570c736fc455 8cafd7266fa02e0863bacbf872fe635c0b9725eb git Not specified
CNA Linux Linux affected 48a066e72d970a3e225a9c18690d570c736fc455 b55996939c71a3e1a38f3cdc6a8859797efc9083 git Not specified
CNA Linux Linux affected 48a066e72d970a3e225a9c18690d570c736fc455 250cf3693060a5f803c5f1ddc082bb06b16112a9 git Not specified
CNA Linux Linux affected 3.13 Not specified
CNA Linux Linux unaffected 3.13 semver Not specified
CNA Linux Linux unaffected 5.4.294 5.4.* semver Not specified
CNA Linux Linux unaffected 5.10.238 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.185 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.141 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.93 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.31 6.12.* semver Not specified
CNA Linux Linux unaffected 6.14.9 6.14.* semver Not specified
CNA Linux Linux unaffected 6.15 * original_commit_for_fix Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.5 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.5 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.5 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.5 * custom Not specified
ADP Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.5 * custom Not specified

References

ReferenceSourceLinkTags
lists.debian.org/debian-lts-announce/2025/10/msg00008.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Third Party Advisory
git.kernel.org/stable/c/9b0915e72b3cf52474dcee0b24a2f99d93e604a3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
cert-portal.siemens.com/productcert/html/ssa-082556.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
git.kernel.org/stable/c/8cafd7266fa02e0863bacbf872fe635c0b9725eb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/628fb00195ce21a90cf9e4e3d105cd9e58f77b40 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/b89eb56a378b7b2c1176787fc228d0a57172bdd5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/f6d45fd92f62845cbd1eb5128fd8f0ed7d0c5a42 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/d8ece4ced3b051e656c77180df2e69e19e24edc1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/250cf3693060a5f803c5f1ddc082bb06b16112a9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/b55996939c71a3e1a38f3cdc6a8859797efc9083 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
lists.debian.org/debian-lts-announce/2025/10/msg00007.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Third Party Advisory
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