CVE-2023-53252 (GCVE-0-2023-53252)

Vulnerability from cvelistv5 – Published: 2025-09-15 14:46 – Updated: 2026-01-14 18:02
VLAI?
Title
Bluetooth: use RCU for hci_conn_params and iterate safely in hci_sync
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: use RCU for hci_conn_params and iterate safely in hci_sync hci_update_accept_list_sync iterates over hdev->pend_le_conns and hdev->pend_le_reports, and waits for controller events in the loop body, without holding hdev lock. Meanwhile, these lists and the items may be modified e.g. by le_scan_cleanup. This can invalidate the list cursor or any other item in the list, resulting to invalid behavior (eg use-after-free). Use RCU for the hci_conn_params action lists. Since the loop bodies in hci_sync block and we cannot use RCU or hdev->lock for the whole loop, copy list items first and then iterate on the copy. Only the flags field is written from elsewhere, so READ_ONCE/WRITE_ONCE should guarantee we read valid values. Free params everywhere with hci_conn_params_free so the cleanup is guaranteed to be done properly. This fixes the following, which can be triggered e.g. by BlueZ new mgmt-tester case "Add + Remove Device Nowait - Success", or by changing hci_le_set_cig_params to always return false, and running iso-tester: ================================================================== BUG: KASAN: slab-use-after-free in hci_update_passive_scan_sync (net/bluetooth/hci_sync.c:2536 net/bluetooth/hci_sync.c:2723 net/bluetooth/hci_sync.c:2841) Read of size 8 at addr ffff888001265018 by task kworker/u3:0/32 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-1.fc38 04/01/2014 Workqueue: hci0 hci_cmd_sync_work Call Trace: <TASK> dump_stack_lvl (./arch/x86/include/asm/irqflags.h:134 lib/dump_stack.c:107) print_report (mm/kasan/report.c:320 mm/kasan/report.c:430) ? __virt_addr_valid (./include/linux/mmzone.h:1915 ./include/linux/mmzone.h:2011 arch/x86/mm/physaddr.c:65) ? hci_update_passive_scan_sync (net/bluetooth/hci_sync.c:2536 net/bluetooth/hci_sync.c:2723 net/bluetooth/hci_sync.c:2841) kasan_report (mm/kasan/report.c:538) ? hci_update_passive_scan_sync (net/bluetooth/hci_sync.c:2536 net/bluetooth/hci_sync.c:2723 net/bluetooth/hci_sync.c:2841) hci_update_passive_scan_sync (net/bluetooth/hci_sync.c:2536 net/bluetooth/hci_sync.c:2723 net/bluetooth/hci_sync.c:2841) ? __pfx_hci_update_passive_scan_sync (net/bluetooth/hci_sync.c:2780) ? mutex_lock (kernel/locking/mutex.c:282) ? __pfx_mutex_lock (kernel/locking/mutex.c:282) ? __pfx_mutex_unlock (kernel/locking/mutex.c:538) ? __pfx_update_passive_scan_sync (net/bluetooth/hci_sync.c:2861) hci_cmd_sync_work (net/bluetooth/hci_sync.c:306) process_one_work (./arch/x86/include/asm/preempt.h:27 kernel/workqueue.c:2399) worker_thread (./include/linux/list.h:292 kernel/workqueue.c:2538) ? __pfx_worker_thread (kernel/workqueue.c:2480) kthread (kernel/kthread.c:376) ? __pfx_kthread (kernel/kthread.c:331) ret_from_fork (arch/x86/entry/entry_64.S:314) </TASK> Allocated by task 31: kasan_save_stack (mm/kasan/common.c:46) kasan_set_track (mm/kasan/common.c:52) __kasan_kmalloc (mm/kasan/common.c:374 mm/kasan/common.c:383) hci_conn_params_add (./include/linux/slab.h:580 ./include/linux/slab.h:720 net/bluetooth/hci_core.c:2277) hci_connect_le_scan (net/bluetooth/hci_conn.c:1419 net/bluetooth/hci_conn.c:1589) hci_connect_cis (net/bluetooth/hci_conn.c:2266) iso_connect_cis (net/bluetooth/iso.c:390) iso_sock_connect (net/bluetooth/iso.c:899) __sys_connect (net/socket.c:2003 net/socket.c:2020) __x64_sys_connect (net/socket.c:2027) do_syscall_64 (arch/x86/entry/common.c:50 arch/x86/entry/common.c:80) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:120) Freed by task 15: kasan_save_stack (mm/kasan/common.c:46) kasan_set_track (mm/kasan/common.c:52) kasan_save_free_info (mm/kasan/generic.c:523) __kasan_slab_free (mm/kasan/common.c:238 mm/kasan/common.c:200 mm/kasan/common.c:244) __kmem_cache_free (mm/slub.c:1807 mm/slub.c:3787 mm/slub.c:3800) hci_conn_params_del (net/bluetooth/hci_core.c:2323) le_scan_cleanup (net/bluetooth/hci_conn.c:202) process_one_work (./arch/x86/include/asm/preempt. ---truncated---
Severity ?
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: e8907f76544ffe225ab95d70f7313267b1d0c76d , < 13ad45ad14df992a6754a130a19abc8c142d54e2 (git)
Affected: e8907f76544ffe225ab95d70f7313267b1d0c76d , < cef88a0fd8e9c2e838162fbb742b3e713b811a7e (git)
Affected: e8907f76544ffe225ab95d70f7313267b1d0c76d , < 195ef75e19287b4bc413da3e3e3722b030ac881e (git)
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    Linux Linux Affected: 5.17
Unaffected: 0 , < 5.17 (semver)
Unaffected: 6.1.42 , ≤ 6.1.* (semver)
Unaffected: 6.4.7 , ≤ 6.4.* (semver)
Unaffected: 6.5 , ≤ * (original_commit_for_fix)
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              "baseSeverity": "HIGH",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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            "net/bluetooth/hci_sync.c",
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: use RCU for hci_conn_params and iterate safely in hci_sync\n\nhci_update_accept_list_sync iterates over hdev-\u003epend_le_conns and\nhdev-\u003epend_le_reports, and waits for controller events in the loop body,\nwithout holding hdev lock.\n\nMeanwhile, these lists and the items may be modified e.g. by\nle_scan_cleanup. This can invalidate the list cursor or any other item\nin the list, resulting to invalid behavior (eg use-after-free).\n\nUse RCU for the hci_conn_params action lists. Since the loop bodies in\nhci_sync block and we cannot use RCU or hdev-\u003elock for the whole loop,\ncopy list items first and then iterate on the copy. Only the flags field\nis written from elsewhere, so READ_ONCE/WRITE_ONCE should guarantee we\nread valid values.\n\nFree params everywhere with hci_conn_params_free so the cleanup is\nguaranteed to be done properly.\n\nThis fixes the following, which can be triggered e.g. by BlueZ new\nmgmt-tester case \"Add + Remove Device Nowait - Success\", or by changing\nhci_le_set_cig_params to always return false, and running iso-tester:\n\n==================================================================\nBUG: KASAN: slab-use-after-free in hci_update_passive_scan_sync (net/bluetooth/hci_sync.c:2536 net/bluetooth/hci_sync.c:2723 net/bluetooth/hci_sync.c:2841)\nRead of size 8 at addr ffff888001265018 by task kworker/u3:0/32\n\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-1.fc38 04/01/2014\nWorkqueue: hci0 hci_cmd_sync_work\nCall Trace:\n\u003cTASK\u003e\ndump_stack_lvl (./arch/x86/include/asm/irqflags.h:134 lib/dump_stack.c:107)\nprint_report (mm/kasan/report.c:320 mm/kasan/report.c:430)\n? __virt_addr_valid (./include/linux/mmzone.h:1915 ./include/linux/mmzone.h:2011 arch/x86/mm/physaddr.c:65)\n? hci_update_passive_scan_sync (net/bluetooth/hci_sync.c:2536 net/bluetooth/hci_sync.c:2723 net/bluetooth/hci_sync.c:2841)\nkasan_report (mm/kasan/report.c:538)\n? hci_update_passive_scan_sync (net/bluetooth/hci_sync.c:2536 net/bluetooth/hci_sync.c:2723 net/bluetooth/hci_sync.c:2841)\nhci_update_passive_scan_sync (net/bluetooth/hci_sync.c:2536 net/bluetooth/hci_sync.c:2723 net/bluetooth/hci_sync.c:2841)\n? __pfx_hci_update_passive_scan_sync (net/bluetooth/hci_sync.c:2780)\n? mutex_lock (kernel/locking/mutex.c:282)\n? __pfx_mutex_lock (kernel/locking/mutex.c:282)\n? __pfx_mutex_unlock (kernel/locking/mutex.c:538)\n? __pfx_update_passive_scan_sync (net/bluetooth/hci_sync.c:2861)\nhci_cmd_sync_work (net/bluetooth/hci_sync.c:306)\nprocess_one_work (./arch/x86/include/asm/preempt.h:27 kernel/workqueue.c:2399)\nworker_thread (./include/linux/list.h:292 kernel/workqueue.c:2538)\n? __pfx_worker_thread (kernel/workqueue.c:2480)\nkthread (kernel/kthread.c:376)\n? __pfx_kthread (kernel/kthread.c:331)\nret_from_fork (arch/x86/entry/entry_64.S:314)\n\u003c/TASK\u003e\n\nAllocated by task 31:\nkasan_save_stack (mm/kasan/common.c:46)\nkasan_set_track (mm/kasan/common.c:52)\n__kasan_kmalloc (mm/kasan/common.c:374 mm/kasan/common.c:383)\nhci_conn_params_add (./include/linux/slab.h:580 ./include/linux/slab.h:720 net/bluetooth/hci_core.c:2277)\nhci_connect_le_scan (net/bluetooth/hci_conn.c:1419 net/bluetooth/hci_conn.c:1589)\nhci_connect_cis (net/bluetooth/hci_conn.c:2266)\niso_connect_cis (net/bluetooth/iso.c:390)\niso_sock_connect (net/bluetooth/iso.c:899)\n__sys_connect (net/socket.c:2003 net/socket.c:2020)\n__x64_sys_connect (net/socket.c:2027)\ndo_syscall_64 (arch/x86/entry/common.c:50 arch/x86/entry/common.c:80)\nentry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:120)\n\nFreed by task 15:\nkasan_save_stack (mm/kasan/common.c:46)\nkasan_set_track (mm/kasan/common.c:52)\nkasan_save_free_info (mm/kasan/generic.c:523)\n__kasan_slab_free (mm/kasan/common.c:238 mm/kasan/common.c:200 mm/kasan/common.c:244)\n__kmem_cache_free (mm/slub.c:1807 mm/slub.c:3787 mm/slub.c:3800)\nhci_conn_params_del (net/bluetooth/hci_core.c:2323)\nle_scan_cleanup (net/bluetooth/hci_conn.c:202)\nprocess_one_work (./arch/x86/include/asm/preempt.\n---truncated---"
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      "title": "Bluetooth: use RCU for hci_conn_params and iterate safely in hci_sync",
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    "datePublished": "2025-09-15T14:46:21.720Z",
    "dateReserved": "2025-09-15T14:19:21.849Z",
    "dateUpdated": "2026-01-14T18:02:52.248Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.8, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"HIGH\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2023-53252\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-01-14T18:00:42.346483Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-416\", \"description\": \"CWE-416 Use After Free\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-01-14T18:00:37.807Z\"}}], \"cna\": {\"title\": \"Bluetooth: use RCU for hci_conn_params and iterate safely in hci_sync\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"e8907f76544ffe225ab95d70f7313267b1d0c76d\", \"lessThan\": \"13ad45ad14df992a6754a130a19abc8c142d54e2\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e8907f76544ffe225ab95d70f7313267b1d0c76d\", \"lessThan\": \"cef88a0fd8e9c2e838162fbb742b3e713b811a7e\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e8907f76544ffe225ab95d70f7313267b1d0c76d\", \"lessThan\": \"195ef75e19287b4bc413da3e3e3722b030ac881e\", \"versionType\": \"git\"}], \"programFiles\": [\"include/net/bluetooth/hci_core.h\", \"net/bluetooth/hci_conn.c\", \"net/bluetooth/hci_core.c\", \"net/bluetooth/hci_event.c\", \"net/bluetooth/hci_sync.c\", \"net/bluetooth/mgmt.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.17\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.17\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.1.42\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.4.7\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.4.*\"}, {\"status\": \"unaffected\", \"version\": \"6.5\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"include/net/bluetooth/hci_core.h\", \"net/bluetooth/hci_conn.c\", \"net/bluetooth/hci_core.c\", \"net/bluetooth/hci_event.c\", \"net/bluetooth/hci_sync.c\", \"net/bluetooth/mgmt.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/13ad45ad14df992a6754a130a19abc8c142d54e2\"}, {\"url\": \"https://git.kernel.org/stable/c/cef88a0fd8e9c2e838162fbb742b3e713b811a7e\"}, {\"url\": \"https://git.kernel.org/stable/c/195ef75e19287b4bc413da3e3e3722b030ac881e\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nBluetooth: use RCU for hci_conn_params and iterate safely in hci_sync\\n\\nhci_update_accept_list_sync iterates over hdev-\u003epend_le_conns and\\nhdev-\u003epend_le_reports, and waits for controller events in the loop body,\\nwithout holding hdev lock.\\n\\nMeanwhile, these lists and the items may be modified e.g. by\\nle_scan_cleanup. This can invalidate the list cursor or any other item\\nin the list, resulting to invalid behavior (eg use-after-free).\\n\\nUse RCU for the hci_conn_params action lists. Since the loop bodies in\\nhci_sync block and we cannot use RCU or hdev-\u003elock for the whole loop,\\ncopy list items first and then iterate on the copy. Only the flags field\\nis written from elsewhere, so READ_ONCE/WRITE_ONCE should guarantee we\\nread valid values.\\n\\nFree params everywhere with hci_conn_params_free so the cleanup is\\nguaranteed to be done properly.\\n\\nThis fixes the following, which can be triggered e.g. by BlueZ new\\nmgmt-tester case \\\"Add + Remove Device Nowait - Success\\\", or by changing\\nhci_le_set_cig_params to always return false, and running iso-tester:\\n\\n==================================================================\\nBUG: KASAN: slab-use-after-free in hci_update_passive_scan_sync (net/bluetooth/hci_sync.c:2536 net/bluetooth/hci_sync.c:2723 net/bluetooth/hci_sync.c:2841)\\nRead of size 8 at addr ffff888001265018 by task kworker/u3:0/32\\n\\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-1.fc38 04/01/2014\\nWorkqueue: hci0 hci_cmd_sync_work\\nCall Trace:\\n\u003cTASK\u003e\\ndump_stack_lvl (./arch/x86/include/asm/irqflags.h:134 lib/dump_stack.c:107)\\nprint_report (mm/kasan/report.c:320 mm/kasan/report.c:430)\\n? __virt_addr_valid (./include/linux/mmzone.h:1915 ./include/linux/mmzone.h:2011 arch/x86/mm/physaddr.c:65)\\n? hci_update_passive_scan_sync (net/bluetooth/hci_sync.c:2536 net/bluetooth/hci_sync.c:2723 net/bluetooth/hci_sync.c:2841)\\nkasan_report (mm/kasan/report.c:538)\\n? hci_update_passive_scan_sync (net/bluetooth/hci_sync.c:2536 net/bluetooth/hci_sync.c:2723 net/bluetooth/hci_sync.c:2841)\\nhci_update_passive_scan_sync (net/bluetooth/hci_sync.c:2536 net/bluetooth/hci_sync.c:2723 net/bluetooth/hci_sync.c:2841)\\n? __pfx_hci_update_passive_scan_sync (net/bluetooth/hci_sync.c:2780)\\n? mutex_lock (kernel/locking/mutex.c:282)\\n? __pfx_mutex_lock (kernel/locking/mutex.c:282)\\n? __pfx_mutex_unlock (kernel/locking/mutex.c:538)\\n? __pfx_update_passive_scan_sync (net/bluetooth/hci_sync.c:2861)\\nhci_cmd_sync_work (net/bluetooth/hci_sync.c:306)\\nprocess_one_work (./arch/x86/include/asm/preempt.h:27 kernel/workqueue.c:2399)\\nworker_thread (./include/linux/list.h:292 kernel/workqueue.c:2538)\\n? __pfx_worker_thread (kernel/workqueue.c:2480)\\nkthread (kernel/kthread.c:376)\\n? __pfx_kthread (kernel/kthread.c:331)\\nret_from_fork (arch/x86/entry/entry_64.S:314)\\n\u003c/TASK\u003e\\n\\nAllocated by task 31:\\nkasan_save_stack (mm/kasan/common.c:46)\\nkasan_set_track (mm/kasan/common.c:52)\\n__kasan_kmalloc (mm/kasan/common.c:374 mm/kasan/common.c:383)\\nhci_conn_params_add (./include/linux/slab.h:580 ./include/linux/slab.h:720 net/bluetooth/hci_core.c:2277)\\nhci_connect_le_scan (net/bluetooth/hci_conn.c:1419 net/bluetooth/hci_conn.c:1589)\\nhci_connect_cis (net/bluetooth/hci_conn.c:2266)\\niso_connect_cis (net/bluetooth/iso.c:390)\\niso_sock_connect (net/bluetooth/iso.c:899)\\n__sys_connect (net/socket.c:2003 net/socket.c:2020)\\n__x64_sys_connect (net/socket.c:2027)\\ndo_syscall_64 (arch/x86/entry/common.c:50 arch/x86/entry/common.c:80)\\nentry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:120)\\n\\nFreed by task 15:\\nkasan_save_stack (mm/kasan/common.c:46)\\nkasan_set_track (mm/kasan/common.c:52)\\nkasan_save_free_info (mm/kasan/generic.c:523)\\n__kasan_slab_free (mm/kasan/common.c:238 mm/kasan/common.c:200 mm/kasan/common.c:244)\\n__kmem_cache_free (mm/slub.c:1807 mm/slub.c:3787 mm/slub.c:3800)\\nhci_conn_params_del (net/bluetooth/hci_core.c:2323)\\nle_scan_cleanup (net/bluetooth/hci_conn.c:202)\\nprocess_one_work (./arch/x86/include/asm/preempt.\\n---truncated---\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.42\", \"versionStartIncluding\": \"5.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.4.7\", \"versionStartIncluding\": \"5.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.5\", \"versionStartIncluding\": \"5.17\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-09-15T14:46:21.720Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2023-53252\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-01-14T18:02:52.248Z\", \"dateReserved\": \"2025-09-15T14:19:21.849Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-09-15T14:46:21.720Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Sightings

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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.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • 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.