Vulnerability-Lookup

FKIE_CVE-2025-38058

Vulnerability from fkie_nvd - Published: 2025-06-18 10:15 - Updated: 2026-07-30 06:22

Severity

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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

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

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	6.15
linux	linux_kernel	6.15
linux	linux_kernel	6.15
linux	linux_kernel	6.15
linux	linux_kernel	6.15
debian	debian_linux	11.0

JSON

To clipboard

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\n__legitimize_mnt(): check for MNT_SYNC_UMOUNT should be under mount_lock\n\n... or we risk stealing final mntput from sync umount - raising mnt_count\nafter umount(2) has verified that victim is not busy, but before it\nhas set MNT_SYNC_UMOUNT; in that case __legitimize_mnt() doesn\u0027t see\nthat it\u0027s safe to quietly undo mnt_count increment and leaves dropping\nthe reference to caller, where it\u0027ll be a full-blown mntput().\n\nCheck under mount_lock is needed; leaving the current one done before\ntaking that makes no sense - it\u0027s nowhere near common enough to bother\nwith."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: __legitimize_mnt(): la comprobaci\u00f3n de MNT_SYNC_UMOUNT debe estar bajo mount_lock... o corremos el riesgo de robar la mntput final de sync umount, lo que genera mnt_count despu\u00e9s de que umount(2) haya verificado que la v\u00edctima no est\u00e1 ocupada, pero antes de que haya establecido MNT_SYNC_UMOUNT. En ese caso, __legitimize_mnt() no considera que sea seguro deshacer silenciosamente el incremento de mnt_count y contin\u00faa eliminando la referencia al llamador, donde se ejecutar\u00e1 una mntput() completa. Es necesaria la comprobaci\u00f3n bajo mount_lock; dejar la actual activada antes de tomarla no tiene sentido; no es lo suficientemente com\u00fan como para molestarse en hacerlo."
    }
  ],
  "id": "CVE-2025-38058",
  "lastModified": "2026-07-30T06:22:47.287",
  "metrics": {
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          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
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          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
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        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
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  "published": "2025-06-18T10:15:38.590",
  "references": [
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      "tags": [
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
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          "lang": "en",
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      "source": "nvd@nist.gov",
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  ]
}

CVE-2025-38058 (GCVE-0-2025-38058)

Vulnerability from cvelistv5 – Published: 2025-06-18 09:33 – Updated: 2026-08-05 11:59

Title

__legitimize_mnt(): check for MNT_SYNC_UMOUNT should be under mount_lock

Summary

Severity

7.8 (High)


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

Assigner

Linux mitre root Scorecard

References

11 references

URL	Tags
https://git.kernel.org/stable/c/628fb00195ce21a90…
https://git.kernel.org/stable/c/b89eb56a378b7b2c1…
https://git.kernel.org/stable/c/f6d45fd92f62845cb…
https://git.kernel.org/stable/c/9b0915e72b3cf5247…
https://git.kernel.org/stable/c/d8ece4ced3b051e65…
https://git.kernel.org/stable/c/8cafd7266fa02e086…
https://git.kernel.org/stable/c/b55996939c71a3e1a…
https://git.kernel.org/stable/c/250cf3693060a5f80…
https://lists.debian.org/debian-lts-announce/2025…
https://lists.debian.org/debian-lts-announce/2025…
https://cert-portal.siemens.com/productcert/html/…

Impacted products

5 products

Vendor	Product	Version
Linux	Linux	Affected: 48a066e72d970a3e225a9c18690d570c736fc455 , < 628fb00195ce21a90cf9e4e3d105cd9e58f77b40 (git) Affected: 48a066e72d970a3e225a9c18690d570c736fc455 , < b89eb56a378b7b2c1176787fc228d0a57172bdd5 (git) Affected: 48a066e72d970a3e225a9c18690d570c736fc455 , < f6d45fd92f62845cbd1eb5128fd8f0ed7d0c5a42 (git) Affected: 48a066e72d970a3e225a9c18690d570c736fc455 , < 9b0915e72b3cf52474dcee0b24a2f99d93e604a3 (git) Affected: 48a066e72d970a3e225a9c18690d570c736fc455 , < d8ece4ced3b051e656c77180df2e69e19e24edc1 (git) Affected: 48a066e72d970a3e225a9c18690d570c736fc455 , < 8cafd7266fa02e0863bacbf872fe635c0b9725eb (git) Affected: 48a066e72d970a3e225a9c18690d570c736fc455 , < b55996939c71a3e1a38f3cdc6a8859797efc9083 (git) Affected: 48a066e72d970a3e225a9c18690d570c736fc455 , < 250cf3693060a5f803c5f1ddc082bb06b16112a9 (git)
Linux	Linux	Affected: 3.13 Unaffected: 0 , < 3.13 (semver) Unaffected: 5.4.294 , ≤ 5.4.* (semver) Unaffected: 5.10.238 , ≤ 5.10.* (semver) Unaffected: 5.15.185 , ≤ 5.15.* (semver) Unaffected: 6.1.141 , ≤ 6.1.* (semver) Unaffected: 6.6.93 , ≤ 6.6.* (semver) Unaffected: 6.12.31 , ≤ 6.12.* (semver) Unaffected: 6.14.9 , ≤ 6.14.* (semver) Unaffected: 6.15 , ≤ * (original_commit_for_fix)
Siemens	SIMATIC S7-1500 CPU 1518-4 PN/DP MFP	Affected: V3.1.5 , < * (custom)
Siemens	SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP	Affected: V3.1.5 , < * (custom)
Siemens	SIPLUS S7-1500 CPU 1518-4 PN/DP MFP	Affected: V3.1.5 , < * (custom)

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{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2025-11-03T17:33:27.007Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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            "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
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        "title": "CVE Program Container"
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                "status": "affected",
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            "vendor": "Siemens",
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                "status": "affected",
                "version": "V3.1.5",
                "versionType": "custom"
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        "providerMetadata": {
          "dateUpdated": "2026-07-14T12:41:20.494Z",
          "orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
          "shortName": "siemens-SADP"
        },
        "references": [
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        "x_adpType": "supplier"
      }
    ],
    "cna": {
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          "product": "Linux",
          "programFiles": [
            "fs/namespace.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
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              "status": "affected",
              "version": "48a066e72d970a3e225a9c18690d570c736fc455",
              "versionType": "git"
            },
            {
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              "status": "affected",
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            {
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              "status": "affected",
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              "versionType": "git"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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              "version": "0",
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              "status": "unaffected",
              "version": "5.4.294",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "5.10.238",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "5.15.185",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.1.141",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.93",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.31",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "6.14.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.15",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.4.294",
                  "versionStartIncluding": "3.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.238",
                  "versionStartIncluding": "3.13",
                  "vulnerable": true
                },
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "vulnerable": true
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                {
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                  "versionEndExcluding": "6.1.141",
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              "negate": false,
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\n__legitimize_mnt(): check for MNT_SYNC_UMOUNT should be under mount_lock\n\n... or we risk stealing final mntput from sync umount - raising mnt_count\nafter umount(2) has verified that victim is not busy, but before it\nhas set MNT_SYNC_UMOUNT; in that case __legitimize_mnt() doesn\u0027t see\nthat it\u0027s safe to quietly undo mnt_count increment and leaves dropping\nthe reference to caller, where it\u0027ll be a full-blown mntput().\n\nCheck under mount_lock is needed; leaving the current one done before\ntaking that makes no sense - it\u0027s nowhere near common enough to bother\nwith."
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            "baseSeverity": "HIGH",
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            "version": "3.1"
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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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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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    "datePublished": "2025-06-18T09:33:38.022Z",
    "dateReserved": "2025-04-16T04:51:23.979Z",
    "dateUpdated": "2026-08-05T11:59:08.465Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
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Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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FKIE_CVE-2025-38058

CVE-2025-38058 (GCVE-0-2025-38058)

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