CVE-2023-52885 (GCVE-0-2023-52885)
Vulnerability from cvelistv5
Published
2024-07-14 07:11
Modified
2026-05-11 19:34
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: SUNRPC: Fix UAF in svc_tcp_listen_data_ready() After the listener svc_sock is freed, and before invoking svc_tcp_accept() for the established child sock, there is a window that the newsock retaining a freed listener svc_sock in sk_user_data which cloning from parent. In the race window, if data is received on the newsock, we will observe use-after-free report in svc_tcp_listen_data_ready(). Reproduce by two tasks: 1. while :; do rpc.nfsd 0 ; rpc.nfsd; done 2. while :; do echo "" | ncat -4 127.0.0.1 2049 ; done KASAN report: ================================================================== BUG: KASAN: slab-use-after-free in svc_tcp_listen_data_ready+0x1cf/0x1f0 [sunrpc] Read of size 8 at addr ffff888139d96228 by task nc/102553 CPU: 7 PID: 102553 Comm: nc Not tainted 6.3.0+ #18 Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 11/12/2020 Call Trace: <IRQ> dump_stack_lvl+0x33/0x50 print_address_description.constprop.0+0x27/0x310 print_report+0x3e/0x70 kasan_report+0xae/0xe0 svc_tcp_listen_data_ready+0x1cf/0x1f0 [sunrpc] tcp_data_queue+0x9f4/0x20e0 tcp_rcv_established+0x666/0x1f60 tcp_v4_do_rcv+0x51c/0x850 tcp_v4_rcv+0x23fc/0x2e80 ip_protocol_deliver_rcu+0x62/0x300 ip_local_deliver_finish+0x267/0x350 ip_local_deliver+0x18b/0x2d0 ip_rcv+0x2fb/0x370 __netif_receive_skb_one_core+0x166/0x1b0 process_backlog+0x24c/0x5e0 __napi_poll+0xa2/0x500 net_rx_action+0x854/0xc90 __do_softirq+0x1bb/0x5de do_softirq+0xcb/0x100 </IRQ> <TASK> ... </TASK> Allocated by task 102371: kasan_save_stack+0x1e/0x40 kasan_set_track+0x21/0x30 __kasan_kmalloc+0x7b/0x90 svc_setup_socket+0x52/0x4f0 [sunrpc] svc_addsock+0x20d/0x400 [sunrpc] __write_ports_addfd+0x209/0x390 [nfsd] write_ports+0x239/0x2c0 [nfsd] nfsctl_transaction_write+0xac/0x110 [nfsd] vfs_write+0x1c3/0xae0 ksys_write+0xed/0x1c0 do_syscall_64+0x38/0x90 entry_SYSCALL_64_after_hwframe+0x72/0xdc Freed by task 102551: kasan_save_stack+0x1e/0x40 kasan_set_track+0x21/0x30 kasan_save_free_info+0x2a/0x50 __kasan_slab_free+0x106/0x190 __kmem_cache_free+0x133/0x270 svc_xprt_free+0x1e2/0x350 [sunrpc] svc_xprt_destroy_all+0x25a/0x440 [sunrpc] nfsd_put+0x125/0x240 [nfsd] nfsd_svc+0x2cb/0x3c0 [nfsd] write_threads+0x1ac/0x2a0 [nfsd] nfsctl_transaction_write+0xac/0x110 [nfsd] vfs_write+0x1c3/0xae0 ksys_write+0xed/0x1c0 do_syscall_64+0x38/0x90 entry_SYSCALL_64_after_hwframe+0x72/0xdc Fix the UAF by simply doing nothing in svc_tcp_listen_data_ready() if state != TCP_LISTEN, that will avoid dereferencing svsk for all child socket.
References
Impacted products
Vendor Product Version
Linux Linux Version: fa9251afc33c81606d70cfe91800a779096442ec
Version: fa9251afc33c81606d70cfe91800a779096442ec
Version: fa9251afc33c81606d70cfe91800a779096442ec
Version: fa9251afc33c81606d70cfe91800a779096442ec
Version: fa9251afc33c81606d70cfe91800a779096442ec
Version: fa9251afc33c81606d70cfe91800a779096442ec
Version: fa9251afc33c81606d70cfe91800a779096442ec
Version: fa9251afc33c81606d70cfe91800a779096442ec
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nSUNRPC: Fix UAF in svc_tcp_listen_data_ready()\n\nAfter the listener svc_sock is freed, and before invoking svc_tcp_accept()\nfor the established child sock, there is a window that the newsock\nretaining a freed listener svc_sock in sk_user_data which cloning from\nparent. In the race window, if data is received on the newsock, we will\nobserve use-after-free report in svc_tcp_listen_data_ready().\n\nReproduce by two tasks:\n\n1. while :; do rpc.nfsd 0 ; rpc.nfsd; done\n2. while :; do echo \"\" | ncat -4 127.0.0.1 2049 ; done\n\nKASAN report:\n\n  ==================================================================\n  BUG: KASAN: slab-use-after-free in svc_tcp_listen_data_ready+0x1cf/0x1f0 [sunrpc]\n  Read of size 8 at addr ffff888139d96228 by task nc/102553\n  CPU: 7 PID: 102553 Comm: nc Not tainted 6.3.0+ #18\n  Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 11/12/2020\n  Call Trace:\n   \u003cIRQ\u003e\n   dump_stack_lvl+0x33/0x50\n   print_address_description.constprop.0+0x27/0x310\n   print_report+0x3e/0x70\n   kasan_report+0xae/0xe0\n   svc_tcp_listen_data_ready+0x1cf/0x1f0 [sunrpc]\n   tcp_data_queue+0x9f4/0x20e0\n   tcp_rcv_established+0x666/0x1f60\n   tcp_v4_do_rcv+0x51c/0x850\n   tcp_v4_rcv+0x23fc/0x2e80\n   ip_protocol_deliver_rcu+0x62/0x300\n   ip_local_deliver_finish+0x267/0x350\n   ip_local_deliver+0x18b/0x2d0\n   ip_rcv+0x2fb/0x370\n   __netif_receive_skb_one_core+0x166/0x1b0\n   process_backlog+0x24c/0x5e0\n   __napi_poll+0xa2/0x500\n   net_rx_action+0x854/0xc90\n   __do_softirq+0x1bb/0x5de\n   do_softirq+0xcb/0x100\n   \u003c/IRQ\u003e\n   \u003cTASK\u003e\n   ...\n   \u003c/TASK\u003e\n\n  Allocated by task 102371:\n   kasan_save_stack+0x1e/0x40\n   kasan_set_track+0x21/0x30\n   __kasan_kmalloc+0x7b/0x90\n   svc_setup_socket+0x52/0x4f0 [sunrpc]\n   svc_addsock+0x20d/0x400 [sunrpc]\n   __write_ports_addfd+0x209/0x390 [nfsd]\n   write_ports+0x239/0x2c0 [nfsd]\n   nfsctl_transaction_write+0xac/0x110 [nfsd]\n   vfs_write+0x1c3/0xae0\n   ksys_write+0xed/0x1c0\n   do_syscall_64+0x38/0x90\n   entry_SYSCALL_64_after_hwframe+0x72/0xdc\n\n  Freed by task 102551:\n   kasan_save_stack+0x1e/0x40\n   kasan_set_track+0x21/0x30\n   kasan_save_free_info+0x2a/0x50\n   __kasan_slab_free+0x106/0x190\n   __kmem_cache_free+0x133/0x270\n   svc_xprt_free+0x1e2/0x350 [sunrpc]\n   svc_xprt_destroy_all+0x25a/0x440 [sunrpc]\n   nfsd_put+0x125/0x240 [nfsd]\n   nfsd_svc+0x2cb/0x3c0 [nfsd]\n   write_threads+0x1ac/0x2a0 [nfsd]\n   nfsctl_transaction_write+0xac/0x110 [nfsd]\n   vfs_write+0x1c3/0xae0\n   ksys_write+0xed/0x1c0\n   do_syscall_64+0x38/0x90\n   entry_SYSCALL_64_after_hwframe+0x72/0xdc\n\nFix the UAF by simply doing nothing in svc_tcp_listen_data_ready()\nif state != TCP_LISTEN, that will avoid dereferencing svsk for all\nchild socket."
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    "dateUpdated": "2026-05-11T19:34:54.708Z",
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