{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-38571",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2025-38571"
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  "published": "2025-08-19T17:19:12Z",
  "summary": "sunrpc: fix client side handling of tls alerts",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsunrpc: fix client side handling of tls alerts\n\nA security exploit was discovered in NFS over TLS in tls_alert_recv\ndue to its assumption that there is valid data in the msghdr's\niterator's kvec.\n\nInstead, this patch proposes the rework how control messages are\nsetup and used by sock_recvmsg().\n\nIf no control message structure is setup, kTLS layer will read and\nprocess TLS data record types. As soon as it encounters a TLS control\nmessage, it would return an error. At that point, NFS can setup a kvec\nbacked control buffer and read in the control message such as a TLS\nalert. Scott found that a msg iterator can advance the kvec pointer\nas a part of the copy process thus we need to revert the iterator\nbefore calling into the tls_alert_recv.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-38571"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a55b3d15331859d9fdd261cfa6d34ca2aeb0fb95"
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    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3ee397eaaca4fa04db21bb98c8f1d0c6cc525368"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3feada5baf4dc96e151ff2ca54630e1d274e5458"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/cc5d59081fa26506d02de2127ab822f40d88bc5a"
    }
  ],
  "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": 8.2,
      "cvss_v3_severity": "High",
      "scenario": "AV:N - The vulnerable code is the SUNRPC/NFS client's TCP-with-TLS receive path, driven entirely by records arriving from the remote RPC peer over the network. A malicious NFS server \u2014 or, with `xprtsec=tls` (anonymous TLS, `tls_client_hello_anon`), any on-path attacker impersonating it \u2014 triggers the bug purely by sending crafted RPC framing followed by a TLS alert record.\nAC:L - The attacker controls both halves of the trigger: an RPC fragment with a bogus calldir or unmatched XID forces the client into the `ITER_DISCARD` path, and an ordinary TLS alert record (even a close_notify) is then sent at will, yielding a deterministic NULL dereference with no race, no memory-layout guessing, and no reliance on victim state.\nPR:N - No credentials or privileges on the victim client are needed; the attacker acts as the TLS peer. With `xprtsec=tls` the peer is entirely unauthenticated (RFC 9289 opportunistic TLS), so even an unauthenticated MITM qualifies, and alerts are processed regardless of RPC-level authentication.\nUI:N - Exploitation needs no action from any user or administrator at attack time \u2014 the NFS-over-TLS mount is pre-existing, and the bug fires from the `xprtiod` workqueue receive path as soon as the attacker's records arrive.\nS:U - The faulting code, the corrupted read, and the resulting crash are all inside the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:L - On the bvec and past-the-end-kvec paths `tls_alert_recv()` reads two bytes through a type-confused or out-of-bounds pointer (a `struct page *` mistaken for `iov_base`, or an adjacent stack/heap word), leaking kernel memory into the `tls_alert_recv` tracepoint and into a fatal/non-fatal error oracle. The disclosure is real but strictly bounded to two bytes and is not returned to the attacker in bulk.\nI:N - `tls_alert_recv()` only reads through the bad pointer \u2014 there is no out-of-bounds write, no use-after-free, and no type confusion that yields a write primitive. The only effect is a bogus alert level selecting `-EACCES` versus `-EAGAIN` in the client's error handling.\nA:H - The `ITER_DISCARD` path dereferences a NULL kvec (and the exhausted-kvec path dereferences a garbage pointer read past the array), producing a kernel oops in the `xprtiod` kworker that kills the RPC receive worker and wedges all NFS I/O on that transport, or panics the machine outright where `panic_on_oops` is set."
    }
  }
}