Description (CNA)
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: <TASK> __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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 0a7e0d0ef05440db03c3199e84d228db943b237f before 98a9cd82c541ef6cbdb829cd6c05cbbb471e373c; affected 0a7e0d0ef05440db03c3199e84d228db943b237f before b9ba5906c42089f8e1d0001b7b50a7940f086cbb; affected 0a7e0d0ef05440db03c3199e84d228db943b237f before aa95efa187b4114075f312b3c4680d050b56fdec; affected 0a7e0d0ef05440db03c3199e84d228db943b237f before 48a07f6e00d305597396da4d7494b81cec05b9d3; affected 0a7e0d0ef05440db03c3199e84d228db943b237f before 44d807320000db0d0013372ad39b53e12d52f758 |
| Linux / Linux | affected 5.6; unaffected 0 before 5.6; unaffected 5.10.178 through 5.10.*; unaffected 5.15.107 through 5.15.*; unaffected 6.1.24 through 6.1.*; unaffected 6.2.11 through 6.2.*; unaffected 6.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/98a9cd82c541ef6cbdb829cd6c05cbbb471e373c
- https://git.kernel.org/stable/c/b9ba5906c42089f8e1d0001b7b50a7940f086cbb
- https://git.kernel.org/stable/c/aa95efa187b4114075f312b3c4680d050b56fdec
- https://git.kernel.org/stable/c/48a07f6e00d305597396da4d7494b81cec05b9d3
- https://git.kernel.org/stable/c/44d807320000db0d0013372ad39b53e12d52f758
ADP enrichment
No English description supplied.
No references supplied.