rxrpc: Fix timeout of a call that hasn't yet been granted a channel

{
  "id": "776951b17927574f3de3adeaa76c19c58c03dd1619f750407273513a8bea710e",
  "url": "https://osv.dev/vulnerability/CVE-2023-54195",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "rxrpc: Fix timeout of a call that hasn't yet been granted a channel",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix timeout of a call that hasn't yet been granted a channel afs_make_call() calls rxrpc_kernel_begin_call() to begin a call (which may get stalled in the background waiting for a connection to become available); it then calls rxrpc_kernel_set_max_life() to set the timeouts - but that starts the call timer so the call timer might then expire before we get a connection assigned - leading to the following oops if the call stalled: BUG: kernel NULL pointer dereference, address: 0000000000000000 ... CPU: 1 PID: 5111 Comm: krxrpcio/0 Not tainted 6.3.0-rc7-build3+ #701 RIP: 0010:rxrpc_alloc_txbuf+0xc0/0x157 ... Call Trace: rxrpc_send_ACK+0x50/0x13b rxrpc_input_call_event+0x16a/0x67d rxrpc_io_thread+0x1b6/0x45f ? _raw_spin_unlock_irqrestore+0x1f/0x35 ? rxrpc_input_packet+0x519/0x519 kthread+0xe7/0xef ? kthread_complete_and_exit+0x1b/0x1b ret_from_fork+0x22/0x30 Fix this by noting the timeouts in struct rxrpc_call when the call is created. The timer will be started when the first packet is transmitted. It shouldn't be possible to trigger this directly from userspace through AF_RXRPC as sendmsg() will return EBUSY if the call is in the waiting-for-conn state if it dropped out of the wait due to a signal.",
    "evidence": "osv:CVE-2023-54195",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.2.16",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.3.3",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2023-54195",
      "aliases": [
        "CVE-2023-54195"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "9d35d880e0e4a3ab32d8c12f9e4d76198aadd42d"
                },
                {
                  "fixed": "92128a7170a220b5126d09a1c1954a3a8d46cef3"
                },
                {
                  "fixed": "72f4a9f3f447948cf86dffe1c4a4c8a429ab9666"
                },
                {
                  "fixed": "db099c625b13a74d462521a46d98a8ce5b53af5d"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-54195.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.2.16"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.3.0"
                },
                {
                  "fixed": "6.3.3"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-54195.json"
          }
        }
      ],
      "modified": "2026-10-30T02:31:08.443760442Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/72f4a9f3f447948cf86dffe1c4a4c8a429ab9666",
        "https://git.kernel.org/stable/c/92128a7170a220b5126d09a1c1954a3a8d46cef3",
        "https://git.kernel.org/stable/c/db099c625b13a74d462521a46d98a8ce5b53af5d",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/54xxx/CVE-2023-54195.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-54195",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/54xxx/CVE-2023-54195.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2023-54195",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 496391,
  "published_at": "2025-12-30T12:09:02.123+00:00"
}