ghsa-3w47-qc84-prwf
Vulnerability from github
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 improving the protection of node reference.
{
"affected": [],
"aliases": [
"CVE-2023-53445"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-09-18T16:15:48Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: qrtr: Fix a refcount bug in qrtr_recvmsg()\n\nSyzbot reported a bug as following:\n\nrefcount_t: addition on 0; use-after-free.\n...\nRIP: 0010:refcount_warn_saturate+0x17c/0x1f0 lib/refcount.c:25\n...\nCall Trace:\n \u003cTASK\u003e\n __refcount_add include/linux/refcount.h:199 [inline]\n __refcount_inc include/linux/refcount.h:250 [inline]\n refcount_inc include/linux/refcount.h:267 [inline]\n kref_get include/linux/kref.h:45 [inline]\n qrtr_node_acquire net/qrtr/af_qrtr.c:202 [inline]\n qrtr_node_lookup net/qrtr/af_qrtr.c:398 [inline]\n qrtr_send_resume_tx net/qrtr/af_qrtr.c:1003 [inline]\n qrtr_recvmsg+0x85f/0x990 net/qrtr/af_qrtr.c:1070\n sock_recvmsg_nosec net/socket.c:1017 [inline]\n sock_recvmsg+0xe2/0x160 net/socket.c:1038\n qrtr_ns_worker+0x170/0x1700 net/qrtr/ns.c:688\n process_one_work+0x991/0x15c0 kernel/workqueue.c:2390\n worker_thread+0x669/0x1090 kernel/workqueue.c:2537\n\nIt occurs in the concurrent scenario of qrtr_recvmsg() and\nqrtr_endpoint_unregister() as following:\n\n\tcpu0\t\t\t\t\tcpu1\nqrtr_recvmsg\t\t\t\tqrtr_endpoint_unregister\nqrtr_send_resume_tx\t\t\tqrtr_node_release\nqrtr_node_lookup\t\t\tmutex_lock(\u0026qrtr_node_lock)\nspin_lock_irqsave(\u0026qrtr_nodes_lock, )\trefcount_dec_and_test(\u0026node-\u003eref) [node-\u003eref == 0]\nradix_tree_lookup [node != NULL]\t__qrtr_node_release\nqrtr_node_acquire\t\t\tspin_lock_irqsave(\u0026qrtr_nodes_lock, )\nkref_get(\u0026node-\u003eref) [WARNING]\t\t...\n\t\t\t\t\tmutex_unlock(\u0026qrtr_node_lock)\n\nUse qrtr_node_lock to protect qrtr_node_lookup() implementation, this\nis actually improving the protection of node reference.",
"id": "GHSA-3w47-qc84-prwf",
"modified": "2025-09-18T18:30:28Z",
"published": "2025-09-18T18:30:28Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-53445"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/44d807320000db0d0013372ad39b53e12d52f758"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/48a07f6e00d305597396da4d7494b81cec05b9d3"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/98a9cd82c541ef6cbdb829cd6c05cbbb471e373c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/aa95efa187b4114075f312b3c4680d050b56fdec"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b9ba5906c42089f8e1d0001b7b50a7940f086cbb"
}
],
"schema_version": "1.4.0",
"severity": []
}
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
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- Confirmed: The vulnerability is confirmed from an analyst perspective.
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