CVE-2025-38393

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A hostile or compromised MDS, or an on-path attacker on a default AUTH_SYS/TCP mount, triggers the race entirely over the network.\nAC:L - The remote server can drive an unbounded stream of layout recalls and stateid-invalidating LAYOUTGET errors concurrently with the client's ongoing I/O, retrying the drain/wake cycle until the missed-wakeup window lands. The attacker controls the triggering side of the race and the retry rate, so the condition is not beyond their influence.\nPR:N - The NFS client holds no authentication requirement over the server \u2014 the client authenticates to the server, never the reverse, and under the default AUTH_SYS there is no server authentication at all. No credentials or privileges on the target system are needed.\nUI:N - Exploitation needs only normal read/writeback activity on an already-mounted pNFS filesystem (fstab, autofs, cloud NFS), which happens continuously without any victim action. No mount or file operation must be induced at exploit time.\nS:U - The lost wakeup hangs kernel tasks within the same security authority as the affected client kernel. No VM, IOMMU, or sandbox boundary is crossed.\nC:N - The defect is a missing memory barrier before wake_up_bit(); no memory is read out of bounds, freed, or exposed. No data is disclosed.\nI:N - No memory is corrupted and no data is modified \u2014 the task simply never wakes. There is no write primitive or control-flow influence.\nA:H - The waiter in pnfs_update_layout() sleeps indefinitely while holding the page lock, and other writeback tasks then block uninterruptibly on that same page lock, wedging writeback across the system as observed in production. 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"es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: NFSv4/pNFS: Correcci\u00f3n de una ejecuci\u00f3n para reactivar NFS_LAYOUT_DRAIN. Se encontraron varios sistemas bloqueados en espera de escritura diferida en el mismo bloqueo de p\u00e1gina, y una tarea esperando el bit NFS_LAYOUT_DRAIN en pnfs_update_layout(). Sin embargo, el recuento plh_outstanding de pnfs_layout_hdr era cero. Lo m\u00e1s probable es que se trate de otra ejecuci\u00f3n entre el que espera y el que reactiva, similar al commit ed0172af5d6f (\"SUNRPC: Correcci\u00f3n de una ejecuci\u00f3n para reactivar una tarea de sincronizaci\u00f3n\"). Se soluciona aplicando la barrera recomendada."}], "id": "CVE-2025-38393", "lastModified": "2026-07-30T06:23:11.647", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 4.7, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.0, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2025-07-25T13:15:28.723", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/08287df60bac5b008b6bcdb03053988335d3d282"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1f4da20080718f258e189a2c5f515385fa393da6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/864a54c1243ed3ca60baa4bc492dede1361f4c83"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8846fd02c98da8b79e6343a20e6071be6f372180"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8ca65fa71024a1767a59ffbc6a6e2278af84735e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c01776287414ca43412d1319d2877cbad65444ac"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e4b13885e7ef1e64e45268feef1e5f0707c47e72"}, {"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-362"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: NFSv4/pNFS: Fix a race to wake on NFS_LAYOUT_DRAIN", "id": "2383408", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2383408"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nNFSv4/pNFS: Fix a race to wake on NFS_LAYOUT_DRAIN\nWe found a few different systems hung up in writeback waiting on the same\npage lock, and one task waiting on the NFS_LAYOUT_DRAIN bit in\npnfs_update_layout(), however the pnfs_layout_hdr's plh_outstanding count\nwas zero.\nIt seems most likely that this is another race between the waiter and waker\nsimilar to commit ed0172af5d6f (\"SUNRPC: Fix a race to wake a sync task\").\nFix it up by applying the advised barrier."], "name": "CVE-2025-38393", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-07-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-38393\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-38393\nhttps://lore.kernel.org/linux-cve-announce/2025072508-CVE-2025-38393-f2e8@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-07-26T12:07:30.592519+00:00", "updated": "2025-07-26T12:07:30.592578+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}