{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-38430",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2025-38430"
  ],
  "published": "2025-07-25T14:00:31Z",
  "summary": "nfsd: nfsd4_spo_must_allow() must check this is a v4 compound request",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: nfsd4_spo_must_allow() must check this is a v4 compound request\n\nIf the request being processed is not a v4 compound request, then\nexamining the cstate can have undefined results.\n\nThis patch adds a check that the rpc procedure being executed\n(rq_procinfo) is the NFSPROC4_COMPOUND procedure.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-38430"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/bf78a2706ce975981eb5167f2d3b609eb5d24c19"
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    },
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    },
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    },
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  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T12:19:11Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 9.8,
      "cvss_v3_severity": "Critical",
      "scenario": "AV:N - The vulnerable code is in the in-kernel NFS server and is reached purely by processing NFSv2/NFSv3/NFSACL or NLM RPCs arriving on TCP/2049 (or the lockd port) from a remote peer. 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."
    }
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}