CVE-2025-38058

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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's 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."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/namespace.c"], "versions": [{"version": "48a066e72d970a3e225a9c18690d570c736fc455", "lessThan": 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"defaultStatus": "unknown"}], "references": [{"url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html"}]}, {"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2025-38058", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-15T21:46:56.186006Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-15T21:52:06.947Z"}}]}}

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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."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "48a066e72d970a3e225a9c18690d570c736fc455", "lessThan": "628fb00195ce21a90cf9e4e3d105cd9e58f77b40", "versionType": "git"}, {"status": "affected", "version": "48a066e72d970a3e225a9c18690d570c736fc455", "lessThan": "b89eb56a378b7b2c1176787fc228d0a57172bdd5", "versionType": "git"}, {"status": "affected", "version": "48a066e72d970a3e225a9c18690d570c736fc455", "lessThan": "f6d45fd92f62845cbd1eb5128fd8f0ed7d0c5a42", "versionType": "git"}, {"status": "affected", "version": "48a066e72d970a3e225a9c18690d570c736fc455", "lessThan": "9b0915e72b3cf52474dcee0b24a2f99d93e604a3", "versionType": "git"}, {"status": "affected", "version": "48a066e72d970a3e225a9c18690d570c736fc455", "lessThan": "d8ece4ced3b051e656c77180df2e69e19e24edc1", "versionType": "git"}, {"status": "affected", "version": "48a066e72d970a3e225a9c18690d570c736fc455", "lessThan": "8cafd7266fa02e0863bacbf872fe635c0b9725eb", "versionType": "git"}, {"status": "affected", "version": "48a066e72d970a3e225a9c18690d570c736fc455", "lessThan": "b55996939c71a3e1a38f3cdc6a8859797efc9083", "versionType": "git"}, {"status": "affected", "version": "48a066e72d970a3e225a9c18690d570c736fc455", "lessThan": "250cf3693060a5f803c5f1ddc082bb06b16112a9", "versionType": "git"}], "programFiles": ["fs/namespace.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "3.13"}, {"status": "unaffected", "version": "0", "lessThan": "3.13", "versionType": "semver"}, {"status": "unaffected", "version": "5.4.294", "versionType": "semver", "lessThanOrEqual": "5.4.*"}, {"status": "unaffected", "version": "5.10.238", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.185", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.141", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.93", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.31", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.14.9", "versionType": "semver", "lessThanOrEqual": "6.14.*"}, {"status": "unaffected", "version": "6.15", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["fs/namespace.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/628fb00195ce21a90cf9e4e3d105cd9e58f77b40"}, {"url": "https://git.kernel.org/stable/c/b89eb56a378b7b2c1176787fc228d0a57172bdd5"}, {"url": "https://git.kernel.org/stable/c/f6d45fd92f62845cbd1eb5128fd8f0ed7d0c5a42"}, {"url": "https://git.kernel.org/stable/c/9b0915e72b3cf52474dcee0b24a2f99d93e604a3"}, {"url": "https://git.kernel.org/stable/c/d8ece4ced3b051e656c77180df2e69e19e24edc1"}, {"url": "https://git.kernel.org/stable/c/8cafd7266fa02e0863bacbf872fe635c0b9725eb"}, {"url": "https://git.kernel.org/stable/c/b55996939c71a3e1a38f3cdc6a8859797efc9083"}, {"url": "https://git.kernel.org/stable/c/250cf3693060a5f803c5f1ddc082bb06b16112a9"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "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 - 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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": "2026-10-15T22:18:25.120", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "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"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "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"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-38058", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-15T21:46:56.186006Z", "version": "2.0.3"}}]}, "published": "2025-06-18T10:15:38.590", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/250cf3693060a5f803c5f1ddc082bb06b16112a9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/628fb00195ce21a90cf9e4e3d105cd9e58f77b40"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8cafd7266fa02e0863bacbf872fe635c0b9725eb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9b0915e72b3cf52474dcee0b24a2f99d93e604a3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b55996939c71a3e1a38f3cdc6a8859797efc9083"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b89eb56a378b7b2c1176787fc228d0a57172bdd5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d8ece4ced3b051e656c77180df2e69e19e24edc1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f6d45fd92f62845cbd1eb5128fd8f0ed7d0c5a42"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-667"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: __legitimize_mnt(): check for MNT_SYNC_UMOUNT should be under mount_lock", "id": "2373344", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2373344"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\n__legitimize_mnt(): check for MNT_SYNC_UMOUNT should be under mount_lock\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't see\nthat it's safe to quietly undo mnt_count increment and leaves dropping\nthe reference to caller, where it'll be a full-blown mntput().\nCheck under mount_lock is needed; leaving the current one done before\ntaking that makes no sense - it's nowhere near common enough to bother\nwith."], "name": "CVE-2025-38058", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Under investigation", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Under investigation", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Under investigation", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-06-18T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-38058\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-38058\nhttps://lore.kernel.org/linux-cve-announce/2025061834-CVE-2025-38058-fe06@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-06-23T08:53:48.034679+00:00", "updated": "2025-06-23T08:53:48.034748+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}