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CVE-2023-52885 (GCVE-0-2023-52885)

Vulnerability from cvelistv5 – Published: 2024-07-14 07:11 – Updated: 2026-08-05 09:11
VLAI
Title
SUNRPC: Fix UAF in svc_tcp_listen_data_ready()
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.
Severity
8.1 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 17:00 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: fa9251afc33c81606d70cfe91800a779096442ec , < c7b8c2d06e437639694abe76978e915cfb73f428 (git)
Affected: fa9251afc33c81606d70cfe91800a779096442ec , < dfc896c4a75cb8cd7cb2dfd9b469cf1e3f004254 (git)
Affected: fa9251afc33c81606d70cfe91800a779096442ec , < 42725e5c1b181b757ba11d804443922982334d9b (git)
Affected: fa9251afc33c81606d70cfe91800a779096442ec , < cd5ec3ee52ce4b7e283cc11facfa420c297c8065 (git)
Affected: fa9251afc33c81606d70cfe91800a779096442ec , < fbf4ace39b2e4f3833236afbb2336edbafd75eee (git)
Affected: fa9251afc33c81606d70cfe91800a779096442ec , < ef047411887ff0845afd642d6a687819308e1a4e (git)
Affected: fa9251afc33c81606d70cfe91800a779096442ec , < 7e1f989055622fd086c5dfb291fc72adf5660b6f (git)
Affected: fa9251afc33c81606d70cfe91800a779096442ec , < fc80fc2d4e39137869da3150ee169b40bf879287 (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.8
Unaffected: 0 , < 4.8 (semver)
Unaffected: 4.14.322 , ≤ 4.14.* (semver)
Unaffected: 4.19.291 , ≤ 4.19.* (semver)
Unaffected: 5.4.251 , ≤ 5.4.* (semver)
Unaffected: 5.10.188 , ≤ 5.10.* (semver)
Unaffected: 5.15.121 , ≤ 5.15.* (semver)
Unaffected: 6.1.39 , ≤ 6.1.* (semver)
Unaffected: 6.4.4 , ≤ 6.4.* (semver)
Unaffected: 6.5 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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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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              "value": "AV:N - The UAF is triggered from softirq TCP receive (tcp_data_queue \u2192 svc_tcp_listen_data_ready) on an nfsd/SUNRPC listening service; a remote peer only needs to complete a TCP handshake to port 2049 and send data, matching kernel guidance that nfsd is Network.\nAC:H - The UAF window requires the listener svc_sock to be freed (nfsd/lockd/callback teardown via svc_xprt_destroy_all) while a child still holds the inherited sk_user_data pointer\u2014a victim-side restart/shutdown the remote attacker cannot cause, only race against.\nPR:N - The vulnerable callback runs on a pre-accept child socket during TCP data delivery, before nfsd accepts the connection or performs any RPC authentication, so an unauthenticated network peer suffices.\nUI:N - Exploitation is driven by attacker-sent TCP segments to an already-running SUNRPC listener in softirq context; no victim mount, file open, or other interactive action is required at exploit time.\nS:U - The use-after-free corrupts host kernel heap (svc_sock) within the same OS security authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:H - This is a slab use-after-free of struct svc_sock; reclaim of the freed object lets the callback path read attacker-controlled fields (including sk_odata), enabling arbitrary kernel disclosure per UAF guidance.\nI:H - svc_tcp_listen_data_ready invokes svsk-\u003esk_odata(sk) from the freed object, so a reclaimed function pointer yields a direct control-flow hijack/write primitive characteristic of exploitable kernel UAFs.\nA:H - The KASAN report documents a reproducible slab-use-after-free oops in svc_tcp_listen_data_ready from net_rx softirq, so availability impact is a full kernel crash."
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    "fkie_nvd": {
      "configurations": "[{\"nodes\": [{\"operator\": \"OR\", \"negate\": false, \"cpeMatch\": [{\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"4.8\", \"versionEndExcluding\": \"4.14.322\", \"matchCriteriaId\": \"EA304272-C8A2-45E1-8E51-A4EAB3581183\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"4.15\", \"versionEndExcluding\": \"4.19.291\", \"matchCriteriaId\": \"D2D2CA9F-4CC4-4AF5-8C6D-E58415AB782E\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"4.20\", \"versionEndExcluding\": \"5.4.251\", \"matchCriteriaId\": \"7FA663C4-CA72-4B5A-8592-7354D978F58E\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"5.5\", \"versionEndExcluding\": \"5.10.188\", \"matchCriteriaId\": \"43CAE50A-4A6C-488E-813C-F8DB77C13C8B\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"5.11\", \"versionEndExcluding\": \"5.15.121\", \"matchCriteriaId\": \"EC77775B-EC31-4966-966C-1286C02B2A85\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"5.16\", \"versionEndExcluding\": \"6.1.39\", \"matchCriteriaId\": \"9BD1D4A1-304D-4187-8178-6D7C0050B1AF\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"6.2\", \"versionEndExcluding\": \"6.4.4\", \"matchCriteriaId\": \"A91BC267-63EE-413E-A6EF-6B96C2A278D1\"}]}]}]",
      "descriptions": "[{\"lang\": \"en\", \"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.\"}, {\"lang\": \"es\", \"value\": \"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: SUNRPC: corrige UAF en svc_tcp_listen_data_ready() Despu\\u00e9s de que se libera el oyente svc_sock, y antes de invocar svc_tcp_accept() para el calcet\\u00edn secundario establecido, hay una ventana que indica que el newsock retiene un oyente liberado. svc_sock en sk_user_data que clona desde el padre. En la ventana de ejecuci\\u00f3n, si se reciben datos en el newsock, observaremos el informe de use-after-free en svc_tcp_listen_data_ready(). Reproducir mediante dos tareas: 1. while:; hacer rpc.nfsd 0; rpc.nfsd; hecho 2. mientras:; hacer eco \\\"\\\" | ncat -4 127.0.0.1 2049; Informe KASAN hecho: ================================================= ==================== ERROR: KASAN: slab-use-after-free en svc_tcp_listen_data_ready+0x1cf/0x1f0 [sunrpc] Lectura de tama\\u00f1o 8 en la direcci\\u00f3n ffff888139d96228 por tarea nc /102553 CPU: 7 PID: 102553 Comm: nc Not tainted 6.3.0+ #18 Nombre de hardware: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 12/11/2020 Seguimiento de llamadas:  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_ establecido+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/0x5e 0 __napi_poll+0xa2/0x500 net_rx_action+0x854/0xc90 __do_softirq+0x1bb/0x5de do_softirq+0xcb/0x100   ...  Asignado por la tarea 102371: kasan_save_stack+0x1e/0x40 kasan_set_track+0x21/0x30 __kasan_kmalloc+0x7b/0x90 svc_setup_socket+0x52/0x4f0 [sunrpc] 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+0x3 8/0x90 Entry_SYSCALL_64_after_hwframe+0x72/0xdc Liberado por la tarea 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] _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 entrada_SYSCALL_ 64_after_hwframe+0x72/0xdc Arregle el UAF simplemente sin hacer nada en svc_tcp_listen_data_ready() si state!= TCP_LISTEN, eso evitar\\u00e1 desreferenciar svsk para todos los sockets secundarios.\"}]",
      "id": "CVE-2023-52885",
      "lastModified": "2024-11-21T08:40:48.027",
      "metrics": "{\"cvssMetricV31\": [{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"version\": \"3.1\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\", \"baseScore\": 7.8, \"baseSeverity\": \"HIGH\", \"attackVector\": \"LOCAL\", \"attackComplexity\": \"LOW\", \"privilegesRequired\": \"LOW\", \"userInteraction\": \"NONE\", \"scope\": \"UNCHANGED\", \"confidentialityImpact\": \"HIGH\", \"integrityImpact\": \"HIGH\", \"availabilityImpact\": \"HIGH\"}, \"exploitabilityScore\": 1.8, \"impactScore\": 5.9}]}",
      "published": "2024-07-14T08:15:01.823",
      "references": "[{\"url\": \"https://git.kernel.org/stable/c/42725e5c1b181b757ba11d804443922982334d9b\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/7e1f989055622fd086c5dfb291fc72adf5660b6f\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/c7b8c2d06e437639694abe76978e915cfb73f428\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/cd5ec3ee52ce4b7e283cc11facfa420c297c8065\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/dfc896c4a75cb8cd7cb2dfd9b469cf1e3f004254\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/ef047411887ff0845afd642d6a687819308e1a4e\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/fbf4ace39b2e4f3833236afbb2336edbafd75eee\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/fc80fc2d4e39137869da3150ee169b40bf879287\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/42725e5c1b181b757ba11d804443922982334d9b\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/7e1f989055622fd086c5dfb291fc72adf5660b6f\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/c7b8c2d06e437639694abe76978e915cfb73f428\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/cd5ec3ee52ce4b7e283cc11facfa420c297c8065\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/dfc896c4a75cb8cd7cb2dfd9b469cf1e3f004254\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/ef047411887ff0845afd642d6a687819308e1a4e\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/fbf4ace39b2e4f3833236afbb2336edbafd75eee\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/fc80fc2d4e39137869da3150ee169b40bf879287\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\"]}]",
      "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "vulnStatus": "Modified",
      "weaknesses": "[{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-416\"}]}]"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2023-52885\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-07-14T08:15:01.823\",\"lastModified\":\"2026-08-04T10:18:47.780\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"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.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: SUNRPC: corrige UAF en svc_tcp_listen_data_ready() Despu\u00e9s de que se libera el oyente svc_sock, y antes de invocar svc_tcp_accept() para el calcet\u00edn secundario establecido, hay una ventana que indica que el newsock retiene un oyente liberado. svc_sock en sk_user_data que clona desde el padre. En la ventana de ejecuci\u00f3n, si se reciben datos en el newsock, observaremos el informe de use-after-free en svc_tcp_listen_data_ready(). Reproducir mediante dos tareas: 1. while:; hacer rpc.nfsd 0; rpc.nfsd; hecho 2. mientras:; hacer eco \\\"\\\" | ncat -4 127.0.0.1 2049; Informe KASAN hecho: ================================================= ==================== ERROR: KASAN: slab-use-after-free en svc_tcp_listen_data_ready+0x1cf/0x1f0 [sunrpc] Lectura de tama\u00f1o 8 en la direcci\u00f3n ffff888139d96228 por tarea nc /102553 CPU: 7 PID: 102553 Comm: nc Not tainted 6.3.0+ #18 Nombre de hardware: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 12/11/2020 Seguimiento de llamadas:  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_ establecido+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/0x5e 0 __napi_poll+0xa2/0x500 net_rx_action+0x854/0xc90 __do_softirq+0x1bb/0x5de do_softirq+0xcb/0x100   ...  Asignado por la tarea 102371: kasan_save_stack+0x1e/0x40 kasan_set_track+0x21/0x30 __kasan_kmalloc+0x7b/0x90 svc_setup_socket+0x52/0x4f0 [sunrpc] 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+0x3 8/0x90 Entry_SYSCALL_64_after_hwframe+0x72/0xdc Liberado por la tarea 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] _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 entrada_SYSCALL_ 64_after_hwframe+0x72/0xdc Arregle el UAF simplemente sin hacer nada en svc_tcp_listen_data_ready() si state!= TCP_LISTEN, eso evitar\u00e1 desreferenciar svsk para todos los sockets secundarios.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/sunrpc/svcsock.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"fa9251afc33c81606d70cfe91800a779096442ec\",\"lessThan\":\"c7b8c2d06e437639694abe76978e915cfb73f428\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"fa9251afc33c81606d70cfe91800a779096442ec\",\"lessThan\":\"dfc896c4a75cb8cd7cb2dfd9b469cf1e3f004254\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"fa9251afc33c81606d70cfe91800a779096442ec\",\"lessThan\":\"42725e5c1b181b757ba11d804443922982334d9b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"fa9251afc33c81606d70cfe91800a779096442ec\",\"lessThan\":\"cd5ec3ee52ce4b7e283cc11facfa420c297c8065\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"fa9251afc33c81606d70cfe91800a779096442ec\",\"lessThan\":\"fbf4ace39b2e4f3833236afbb2336edbafd75eee\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"fa9251afc33c81606d70cfe91800a779096442ec\",\"lessThan\":\"ef047411887ff0845afd642d6a687819308e1a4e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"fa9251afc33c81606d70cfe91800a779096442ec\",\"lessThan\":\"7e1f989055622fd086c5dfb291fc72adf5660b6f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"fa9251afc33c81606d70cfe91800a779096442ec\",\"lessThan\":\"fc80fc2d4e39137869da3150ee169b40bf879287\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/sunrpc/svcsock.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.8\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.8\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.14.322\",\"lessThanOrEqual\":\"4.14.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.19.291\",\"lessThanOrEqual\":\"4.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.251\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.188\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.121\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.39\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.4.4\",\"lessThanOrEqual\":\"6.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.5\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":8.1,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.2,\"impactScore\":5.9},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2024-09-10T17:00:55.699629Z\",\"id\":\"CVE-2023-52885\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T19:23:30+00:00",
      "cve": "CVE-2023-52885",
      "id": "CVE-2023-52885",
      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:fixed": "380",
      "product_status:known_affected": "198",
      "product_status:known_not_affected": "13",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: SUNRPC: Fix UAF in svc_tcp_listen_data_ready()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-52885.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-03T16:49:46Z",
      "cve": "CVE-2023-52885",
      "id": "CVE-2023-52885",
      "initial_release_date": "2024-07-16T02:45:24Z",
      "product_status:known_affected": "385",
      "product_status:known_not_affected": "16",
      "product_status:recommended": "987",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2023-52885",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2023-52885.json",
      "version": "121"
    },
    "vulnrichment": {
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a remote peer only needs to complete a TCP handshake to port 2049 and send data, matching kernel guidance that nfsd is Network.\\nAC:H - The UAF window requires the listener svc_sock to be freed (nfsd/lockd/callback teardown via svc_xprt_destroy_all) while a child still holds the inherited sk_user_data pointer\\u2014a victim-side restart/shutdown the remote attacker cannot cause, only race against.\\nPR:N - The vulnerable callback runs on a pre-accept child socket during TCP data delivery, before nfsd accepts the connection or performs any RPC authentication, so an unauthenticated network peer suffices.\\nUI:N - Exploitation is driven by attacker-sent TCP segments to an already-running SUNRPC listener in softirq context; no victim mount, file open, or other interactive action is required at exploit time.\\nS:U - The use-after-free corrupts host kernel heap (svc_sock) within the same OS security authority and does not cross a VM, IOMMU, or sandbox boundary.\\nC:H - This is a slab use-after-free of struct svc_sock; reclaim of the freed object lets the callback path read attacker-controlled fields (including sk_odata), enabling arbitrary kernel disclosure per UAF guidance.\\nI:H - svc_tcp_listen_data_ready invokes svsk-\u003esk_odata(sk) from the freed object, so a reclaimed function pointer yields a direct control-flow hijack/write primitive characteristic of exploitable kernel UAFs.\\nA:H - The KASAN report documents a reproducible slab-use-after-free oops in svc_tcp_listen_data_ready from net_rx softirq, so availability impact is a full kernel crash.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"fa9251afc33c81606d70cfe91800a779096442ec\", \"lessThan\": \"c7b8c2d06e437639694abe76978e915cfb73f428\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"fa9251afc33c81606d70cfe91800a779096442ec\", \"lessThan\": \"dfc896c4a75cb8cd7cb2dfd9b469cf1e3f004254\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"fa9251afc33c81606d70cfe91800a779096442ec\", \"lessThan\": \"42725e5c1b181b757ba11d804443922982334d9b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"fa9251afc33c81606d70cfe91800a779096442ec\", \"lessThan\": \"cd5ec3ee52ce4b7e283cc11facfa420c297c8065\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"fa9251afc33c81606d70cfe91800a779096442ec\", \"lessThan\": \"fbf4ace39b2e4f3833236afbb2336edbafd75eee\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"fa9251afc33c81606d70cfe91800a779096442ec\", \"lessThan\": \"ef047411887ff0845afd642d6a687819308e1a4e\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"fa9251afc33c81606d70cfe91800a779096442ec\", \"lessThan\": \"7e1f989055622fd086c5dfb291fc72adf5660b6f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"fa9251afc33c81606d70cfe91800a779096442ec\", \"lessThan\": \"fc80fc2d4e39137869da3150ee169b40bf879287\", \"versionType\": \"git\"}], \"programFiles\": [\"net/sunrpc/svcsock.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.8\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.8\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.14.322\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.14.*\"}, {\"status\": \"unaffected\", \"version\": \"4.19.291\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.251\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.188\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.121\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.39\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.4.4\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.4.*\"}, {\"status\": \"unaffected\", \"version\": \"6.5\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/sunrpc/svcsock.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/c7b8c2d06e437639694abe76978e915cfb73f428\"}, {\"url\": \"https://git.kernel.org/stable/c/dfc896c4a75cb8cd7cb2dfd9b469cf1e3f004254\"}, {\"url\": \"https://git.kernel.org/stable/c/42725e5c1b181b757ba11d804443922982334d9b\"}, {\"url\": \"https://git.kernel.org/stable/c/cd5ec3ee52ce4b7e283cc11facfa420c297c8065\"}, {\"url\": \"https://git.kernel.org/stable/c/fbf4ace39b2e4f3833236afbb2336edbafd75eee\"}, {\"url\": \"https://git.kernel.org/stable/c/ef047411887ff0845afd642d6a687819308e1a4e\"}, {\"url\": \"https://git.kernel.org/stable/c/7e1f989055622fd086c5dfb291fc72adf5660b6f\"}, {\"url\": \"https://git.kernel.org/stable/c/fc80fc2d4e39137869da3150ee169b40bf879287\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.14.322\", \"versionStartIncluding\": \"4.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.291\", \"versionStartIncluding\": \"4.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.251\", \"versionStartIncluding\": \"4.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.188\", \"versionStartIncluding\": \"4.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.121\", \"versionStartIncluding\": \"4.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.39\", \"versionStartIncluding\": \"4.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.4.4\", \"versionStartIncluding\": \"4.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.5\", \"versionStartIncluding\": \"4.8\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T09:11:51.682Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2023-52885\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T09:11:51.682Z\", \"dateReserved\": \"2024-05-21T15:35:00.782Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-07-14T07:11:28.548Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.