CVE-2025-38430

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No local access is required.\nAC:L - On any export with an explicit sec= list, an RPC using a non-listed flavor (AUTH_SYS/AUTH_NULL) deterministically reaches the type-confused read, and for lockd the out-of-bounds access past the smaller rq_resp allocation is unconditional. The attacker can itself prime the shared per-thread buffer with prior NFSv4.1 compounds and retry indefinitely, so it controls both sides of the stale-data condition.\nPR:N - The path is hit precisely with AUTH_SYS/AUTH_NULL credentials, i.e. before any authentication succeeds \u2014 the bug lives in the code that decides whether authentication is required at all. Exports secured with sec=krb5 are routinely exported to wide host lists (`*`), so no credentials on the target are needed.\nUI:N - Exploitation requires only sending crafted NFSv3/NLM RPCs to the server; no administrator or client-side user action is involved.\nS:U - The type confusion, out-of-bounds reads and the bypassed authorization decision all occur within the kernel's own security authority; no VM, IOMMU or sandbox boundary is crossed.\nC:H - A stale `spo_must_allowed` byte makes check_security_flavor() return nfs_ok, bypassing the export's Kerberos requirement and exposing all file contents on that export to an unauthenticated client; additionally the dangling `cstate->clp` and `test_bit()` with an uncontrolled 32-bit index give wide out-of-bounds/use-after-free kernel reads.\nI:H - The same sec= bypass yields write access to a read-write Kerberos-protected export for an unauthenticated AUTH_SYS client, and the code also writes `cstate->spo_must_allowed` back into a mis-typed response buffer, corrupting whatever NFSv3/NLM structure occupies that offset.\nA:H - `cstate->clp` is an uninitialized, stale or out-of-bounds value used directly as a `struct nfs4_client *` and dereferenced (including a strcmp of `cl_cred.cr_raw_principal` and a bit test at an arbitrary 32-bit offset), which readily faults and oopses the nfsd/lockd thread, and the request can be repeated at will."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/nfsd/nfs4proc.c"], "versions": [{"version": "ed94164398c935a42be7b129a478eb19c598b68a", "lessThan": "bf78a2706ce975981eb5167f2d3b609eb5d24c19", "status": "affected", "versionType": "git"}, {"version": "ed94164398c935a42be7b129a478eb19c598b68a", "lessThan": "b1d0323a09a29f81572c7391e0d80d78724729c9", "status": "affected", "versionType": "git"}, {"version": "ed94164398c935a42be7b129a478eb19c598b68a", 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Exports secured with sec=krb5 are routinely exported to wide host lists (`*`), so no credentials on the target are needed.\nUI:N - Exploitation requires only sending crafted NFSv3/NLM RPCs to the server; no administrator or client-side user action is involved.\nS:U - The type confusion, out-of-bounds reads and the bypassed authorization decision all occur within the kernel's own security authority; no VM, IOMMU or sandbox boundary is crossed.\nC:H - A stale `spo_must_allowed` byte makes check_security_flavor() return nfs_ok, bypassing the export's Kerberos requirement and exposing all file contents on that export to an unauthenticated client; additionally the dangling `cstate->clp` and `test_bit()` with an uncontrolled 32-bit index give wide out-of-bounds/use-after-free kernel reads.\nI:H - The same sec= bypass yields write access to a read-write Kerberos-protected export for an unauthenticated AUTH_SYS client, and the code also writes `cstate->spo_must_allowed` back into a mis-typed response buffer, corrupting whatever NFSv3/NLM structure occupies that offset.\nA:H - `cstate->clp` is an uninitialized, stale or out-of-bounds value used directly as a `struct nfs4_client *` and dereferenced (including a strcmp of `cl_cred.cr_raw_principal` and a bit test at an arbitrary 32-bit offset), which readily faults and oopses the nfsd/lockd thread, and the request can be repeated at will."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "ed94164398c935a42be7b129a478eb19c598b68a", "lessThan": "bf78a2706ce975981eb5167f2d3b609eb5d24c19", "versionType": "git"}, {"status": "affected", "version": "ed94164398c935a42be7b129a478eb19c598b68a", "lessThan": "b1d0323a09a29f81572c7391e0d80d78724729c9", "versionType": "git"}, {"status": "affected", "version": "ed94164398c935a42be7b129a478eb19c598b68a", "lessThan": "425efc6b3292a3c79bfee4a1661cf043dcd9cf2f", 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resuelto la siguiente vulnerabilidad: nfsd: nfsd4_spo_must_allow() debe comprobar que se trata de una solicitud compuesta v4. Si la solicitud que se est\u00e1 procesando no es una solicitud compuesta v4, examinar el estado de ejecuci\u00f3n (cstate) puede tener resultados indefinidos. Este parche a\u00f1ade una comprobaci\u00f3n de que el procedimiento rpc en ejecuci\u00f3n (rq_procinfo) es el procedimiento NFSPROC4_COMPOUND."}], "id": "CVE-2025-38430", "lastModified": "2026-10-15T22:18:40.823", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "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-2025-38430", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-15T21:50:20.466355Z", "version": "2.0.3"}}]}, "published": "2025-07-25T15:15:27.980", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1244f0b2c3cecd3f349a877006e67c9492b41807"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2c54bd5a380ebf646fb9efbc4ae782ff3a83a5af"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/425efc6b3292a3c79bfee4a1661cf043dcd9cf2f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/64a723b0281ecaa59d31aad73ef8e408a84cb603"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7a75a956692aa64211a9e95781af1ec461642de4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b1d0323a09a29f81572c7391e0d80d78724729c9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/bf78a2706ce975981eb5167f2d3b609eb5d24c19"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e7e943ddd1c6731812357a28e7954ade3a7d8517"}, {"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": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: nfsd: nfsd4_spo_must_allow() must check this is a v4 compound request", "id": "2383451", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2383451"}, "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:\nnfsd: nfsd4_spo_must_allow() must check this is a v4 compound request\nIf the request being processed is not a v4 compound request, then\nexamining the cstate can have undefined results.\nThis patch adds a check that the rpc procedure being executed\n(rq_procinfo) is the NFSPROC4_COMPOUND procedure."], "name": "CVE-2025-38430", "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": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "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": "2025-07-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-38430\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-38430\nhttps://lore.kernel.org/linux-cve-announce/2025072556-CVE-2025-38430-dafd@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-07-26T12:07:39.307545+00:00", "updated": "2025-07-26T12:07:39.307599+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}