CVE-2025-39697

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order to avoid races, let's take the page group lock earlier in\nnfs_lock_and_join_requests(), and hold it across the removal of the\nrequest in nfs_inode_remove_request()."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerable code is in the NFS client's buffered-write path and is reached through local `write(2)`/mmap dirtying plus writeback-forcing syscalls (`fsync`, `sync_file_range`, `ftruncate`); a purely remote party cannot create the required local writer, though a malicious NFS server can precisely time the racing removal side via its RPC replies.\nAC:L - The attacker controls both sides of the race \u2014 one thread issues overlapping buffered writes to the same folio while another forces writeback/invalidation \u2014 and can retry the loop indefinitely with no precondition outside their control; server-induced short writes or errors widen the window further.\nPR:L - Only an unprivileged local account with write access to any file on an NFS mount is required, which is the norm on NFS-backed home directories, HPC scratch, and container/Kubernetes NFS volumes.\nUI:N - The attacker's own process performs all the writes, writeback triggers, and truncation; no action by any other user is needed beyond the NFS mount already existing.\nS:U - The corruption and resulting crash are confined to the kernel's own security authority on the affected host; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Detaching the folio from NFS's private bookkeeping while requests are still live breaks the writeback-state invariant, allowing mismatched `folio_start/end_writeback` and stale `req->wb_head`/folio references so freed or recycled page contents can be transmitted to the server and read back, and truncated-mapping pointers are dereferenced.\nI:H - Writes acknowledged to userspace are silently discarded \u2014 the merged request is detached and freed while the folio's dirty bit is consumed by writeback with no RPC sent \u2014 corrupting NFS file data for any process on the client, and kernel request/refcount/`nrequests` state is left inconsistent.\nA:H - The zombie request lets the folio be truncated or reclaimed with `folio->mapping` set to NULL while completion paths unconditionally dereference `folio->mapping->host` (`nfs_page_to_inode`, `nfs_inode_remove_request`, `nfs_folio_end_writeback`), producing a kernel oops, and the `WARN_ON_ONCE` splats panic systems running `panic_on_warn`."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/nfs/pagelist.c", "fs/nfs/write.c", "include/linux/nfs_page.h"], "versions": [{"version": "bd37d6fce184836bd5e7cd90ce40116a4fadaf2a", "lessThan": "0ff42a32784e0f2cb46a46da8e9f473538c13e1b", "status": "affected", 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to\nnfs_inode_remove_request() from succeeding until we actually lock the\npage group.\nThe reason is that whoever called nfs_inode_remove_request() doesn't\nnecessarily have a lock on the page group head.\n\nSo in order to avoid races, let's take the page group lock earlier in\nnfs_lock_and_join_requests(), and hold it across the removal of the\nrequest in nfs_inode_remove_request()."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nNFS: Corregir una condici\u00f3n de carrera al actualizar una escritura existente\n\nDespu\u00e9s de que nfs_lock_and_join_requests() comprueba si la solicitud sigue adjunta al mapeo, nada impide que una llamada a nfs_inode_remove_request() tenga \u00e9xito hasta que realmente bloqueamos el grupo de p\u00e1ginas.\nLa raz\u00f3n es que quienquiera que haya llamado a nfs_inode_remove_request() no tiene necesariamente un bloqueo en la cabecera del grupo de p\u00e1ginas.\n\nAs\u00ed que para evitar condiciones de carrera, tomemos el bloqueo del grupo de p\u00e1ginas antes en nfs_lock_and_join_requests(), y manteng\u00e1moslo durante la eliminaci\u00f3n de la solicitud en nfs_inode_remove_request()."}], "id": "CVE-2025-39697", "lastModified": "2026-10-19T21:10:00.160", "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": "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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-39697", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-06-10T20:42:24.236193Z", "version": "2.0.3"}}]}, "published": "2025-09-05T18:15:46.623", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0ff42a32784e0f2cb46a46da8e9f473538c13e1b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/181feb41f0b268e6288bf9a7b984624d7fe2031d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": 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"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-032379.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: NFS: Fix a race when updating an existing write", "id": "2393481", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2393481"}, "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": ["No description is available for this CVE."], "name": "CVE-2025-39697", "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": "2025-09-05T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-39697\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-39697\nhttps://lore.kernel.org/linux-cve-announce/2025090548-CVE-2025-39697-5284@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-09-06T09:01:40.019603+00:00", "updated": "2025-09-06T09:01:40.019658+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}