net: qrtr: Fix a refcount bug in qrtr_recvmsg()

{
  "id": "d32a3071146b7ad80e42c0b2e20dac2d35a6e0708797d8bce70c86f034d9c91d",
  "url": "https://osv.dev/vulnerability/CVE-2023-53445",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "net: qrtr: Fix a refcount bug in qrtr_recvmsg()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: net: qrtr: Fix a refcount bug in qrtr_recvmsg() Syzbot reported a bug as following: refcount_t: addition on 0; use-after-free. ... RIP: 0010:refcount_warn_saturate+0x17c/0x1f0 lib/refcount.c:25 ... Call Trace: __refcount_add include/linux/refcount.h:199 [inline] __refcount_inc include/linux/refcount.h:250 [inline] refcount_inc include/linux/refcount.h:267 [inline] kref_get include/linux/kref.h:45 [inline] qrtr_node_acquire net/qrtr/af_qrtr.c:202 [inline] qrtr_node_lookup net/qrtr/af_qrtr.c:398 [inline] qrtr_send_resume_tx net/qrtr/af_qrtr.c:1003 [inline] qrtr_recvmsg+0x85f/0x990 net/qrtr/af_qrtr.c:1070 sock_recvmsg_nosec net/socket.c:1017 [inline] sock_recvmsg+0xe2/0x160 net/socket.c:1038 qrtr_ns_worker+0x170/0x1700 net/qrtr/ns.c:688 process_one_work+0x991/0x15c0 kernel/workqueue.c:2390 worker_thread+0x669/0x1090 kernel/workqueue.c:2537 It occurs in the concurrent scenario of qrtr_recvmsg() and qrtr_endpoint_unregister() as following: cpu0 cpu1 qrtr_recvmsg qrtr_endpoint_unregister qrtr_send_resume_tx qrtr_node_release qrtr_node_lookup mutex_lock(&qrtr_node_lock) spin_lock_irqsave(&qrtr_nodes_lock, ) refcount_dec_and_test(&node->ref) [node->ref == 0] radix_tree_lookup [node != NULL] __qrtr_node_release qrtr_node_acquire spin_lock_irqsave(&qrtr_nodes_lock, ) kref_get(&node->ref) [WARNING] ... mutex_unlock(&qrtr_node_lock) Use qrtr_node_lock to protect qrtr_node_lookup() implementation, this is actually improvi",
    "evidence": "osv:CVE-2023-53445",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.10.178",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.107",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.24",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.2.11",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2023-53445",
      "aliases": [
        "CVE-2023-53445"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0a7e0d0ef05440db03c3199e84d228db943b237f"
                },
                {
                  "fixed": "98a9cd82c541ef6cbdb829cd6c05cbbb471e373c"
                },
                {
                  "fixed": "b9ba5906c42089f8e1d0001b7b50a7940f086cbb"
                },
                {
                  "fixed": "aa95efa187b4114075f312b3c4680d050b56fdec"
                },
                {
                  "fixed": "48a07f6e00d305597396da4d7494b81cec05b9d3"
                },
                {
                  "fixed": "44d807320000db0d0013372ad39b53e12d52f758"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-53445.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.6.0"
                },
                {
                  "fixed": "5.10.178"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.11.0"
                },
                {
                  "fixed": "5.15.107"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "6.1.24"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.2.11"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-53445.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:31.282824139Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/44d807320000db0d0013372ad39b53e12d52f758",
        "https://git.kernel.org/stable/c/48a07f6e00d305597396da4d7494b81cec05b9d3",
        "https://git.kernel.org/stable/c/98a9cd82c541ef6cbdb829cd6c05cbbb471e373c",
        "https://git.kernel.org/stable/c/aa95efa187b4114075f312b3c4680d050b56fdec",
        "https://git.kernel.org/stable/c/b9ba5906c42089f8e1d0001b7b50a7940f086cbb",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53445.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-53445",
        "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/2023/53xxx/CVE-2023-53445.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2023-53445",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 497925,
  "published_at": "2025-09-18T16:04:21.257+00:00"
}