{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-72317",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-72317"
  ],
  "published": "2026-08-15T06:04:33Z",
  "summary": "SUNRPC: pin upper rpc_clnt across the TLS connect_worker",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nSUNRPC: pin upper rpc_clnt across the TLS connect_worker\n\nThe TLS connect path has a use-after-free: nothing pins the\nupper rpc_clnt across the delayed connect_worker. xs_connect()\nstores task->tk_client in sock_xprt::clnt as a raw pointer\nand queues the worker; for TLS-secured transports that worker\nis xs_tcp_tls_setup_socket(), which reads several fields out\nof the saved pointer (cl_timeout, cl_program, cl_prog,\ncl_vers, cl_cred, cl_stats) to construct the args for the\ninner handshake rpc_clnt.\n\nThe xprt does not reference the rpc_clnt; the rpc_clnt\nreferences the xprt. xs_destroy() does cancel the\nconnect_worker, but it runs only when the xprt's refcount\ndrops to zero, which cannot happen until the rpc_clnt\nreleases its cl_xprt reference in rpc_free_client_work().\nWhen a TLS handshake fails fatally (for example, an mTLS\nmount whose client cert does not match the server), the\nconnecting task is woken with -EACCES and exits, the mount\ncaller invokes rpc_shutdown_client(), and the upper rpc_clnt\nis freed before the queued connect_worker fires.\nxs_tcp_tls_setup_socket() then dereferences the freed clnt,\nproducing the refcount_t underflow Michael Nemanov reported.\n\nTake a reference on the upper rpc_clnt in xs_connect() for\nTLS transports via a new rpc_hold_client() helper, and drop\nit in the connect_worker's exit path with rpc_release_client().\nThe xprt_lock_connect() / xprt_unlock_connect() pairing\nalready serialises xs_connect() with xs_tcp_tls_setup_socket(),\nso the take and release are balanced one-for-one.\n\nThe non-TLS connect worker (xs_tcp_setup_socket) never reads\nsock_xprt::clnt, so leave that path alone and avoid the\nclnt-holds-xprt-holds-clnt cycle that would otherwise prevent\nxprt destruction.",
  "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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      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-72317"
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    "upstream_modified": "2026-08-17T05:50:24Z",
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      "scenario": "AV:N - The flaw is in the SUNRPC TCP-with-TLS client connect_worker processing a remote NFS server's TLS handshake; a malicious or misconfigured server can induce fatal handshake failure over the network before the delayed worker runs, matching network-reachable kTLS/RPC-with-TLS client paths.\nAC:L - An attacker operating a reachable NFS endpoint can reliably cause fatal TLS handshake failure (e.g., reject mTLS client certificates or send TLS alerts) and influence reconnect timing/backoff so client teardown frees rpc_clnt before the queued connect_worker executes.\nPR:N - Exploitation requires no privileges on the victim host; a remote peer only needs the client kernel to initiate or re-establish an NFS RPC-with-TLS connection, and TLS handshake processing occurs before NFS authentication completes.\nUI:N - No further victim action is needed once an NFS xprtsec=tls/mtls mount exists because automatic reconnect after server-induced disconnect or handshake failure can trigger the race without additional user interaction.\nS:U - Impact is confined to kernel memory corruption and privilege boundaries within the same host; this is standard local kernel compromise rather than crossing VM, container, or IOMMU security scopes.\nC:H - This is a kernel heap use-after-free where xs_tcp_tls_setup_socket reads multiple fields from a freed rpc_clnt (including cl_cred and cl_program), enabling information disclosure and further exploitation beyond a simple crash.\nI:H - Use-after-free of rpc_clnt permits corrupting allocator metadata and adjacent kernel objects; freed-object reuse can yield arbitrary write or control-flow hijack primitives, not merely authenticated data alteration.\nA:H - Accessing the freed rpc_clnt produces a refcount_t underflow and kernel oops/panic; even unsuccessful exploitation typically crashes or hangs the system, and repeated reconnect attempts can deny availability."
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}