CVE-2023-53762 (GCVE-0-2023-53762)

Vulnerability from cvelistv5 – Published: 2025-12-08 01:19 – Updated: 2026-06-16 15:47
VLAI
Title
Bluetooth: hci_sync: Fix UAF in hci_disconnect_all_sync
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sync: Fix UAF in hci_disconnect_all_sync Use-after-free can occur in hci_disconnect_all_sync if a connection is deleted by concurrent processing of a controller event. To prevent this the code now tries to iterate over the list backwards to ensure the links are cleanup before its parents, also it no longer relies on a cursor, instead it always uses the last element since hci_abort_conn_sync is guaranteed to call hci_conn_del. UAF crash log: ================================================================== BUG: KASAN: slab-use-after-free in hci_set_powered_sync (net/bluetooth/hci_sync.c:5424) [bluetooth] Read of size 8 at addr ffff888009d9c000 by task kworker/u9:0/124 CPU: 0 PID: 124 Comm: kworker/u9:0 Tainted: G W 6.5.0-rc1+ #10 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-1.fc38 04/01/2014 Workqueue: hci0 hci_cmd_sync_work [bluetooth] Call Trace: <TASK> dump_stack_lvl+0x5b/0x90 print_report+0xcf/0x670 ? __virt_addr_valid+0xdd/0x160 ? hci_set_powered_sync+0x2c9/0x4a0 [bluetooth] kasan_report+0xa6/0xe0 ? hci_set_powered_sync+0x2c9/0x4a0 [bluetooth] ? __pfx_set_powered_sync+0x10/0x10 [bluetooth] hci_set_powered_sync+0x2c9/0x4a0 [bluetooth] ? __pfx_hci_set_powered_sync+0x10/0x10 [bluetooth] ? __pfx_lock_release+0x10/0x10 ? __pfx_set_powered_sync+0x10/0x10 [bluetooth] hci_cmd_sync_work+0x137/0x220 [bluetooth] process_one_work+0x526/0x9d0 ? __pfx_process_one_work+0x10/0x10 ? __pfx_do_raw_spin_lock+0x10/0x10 ? mark_held_locks+0x1a/0x90 worker_thread+0x92/0x630 ? __pfx_worker_thread+0x10/0x10 kthread+0x196/0x1e0 ? __pfx_kthread+0x10/0x10 ret_from_fork+0x2c/0x50 </TASK> Allocated by task 1782: kasan_save_stack+0x33/0x60 kasan_set_track+0x25/0x30 __kasan_kmalloc+0x8f/0xa0 hci_conn_add+0xa5/0xa80 [bluetooth] hci_bind_cis+0x881/0x9b0 [bluetooth] iso_connect_cis+0x121/0x520 [bluetooth] iso_sock_connect+0x3f6/0x790 [bluetooth] __sys_connect+0x109/0x130 __x64_sys_connect+0x40/0x50 do_syscall_64+0x60/0x90 entry_SYSCALL_64_after_hwframe+0x6e/0xd8 Freed by task 695: kasan_save_stack+0x33/0x60 kasan_set_track+0x25/0x30 kasan_save_free_info+0x2b/0x50 __kasan_slab_free+0x10a/0x180 __kmem_cache_free+0x14d/0x2e0 device_release+0x5d/0xf0 kobject_put+0xdf/0x270 hci_disconn_complete_evt+0x274/0x3a0 [bluetooth] hci_event_packet+0x579/0x7e0 [bluetooth] hci_rx_work+0x287/0xaa0 [bluetooth] process_one_work+0x526/0x9d0 worker_thread+0x92/0x630 kthread+0x196/0x1e0 ret_from_fork+0x2c/0x50 ==================================================================
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 182ee45da083db4e3e621541ccf255bfa9652214 , < a30c074f0b5b7f909a15c978fbc96a29e2f94e42 (git)
Affected: 182ee45da083db4e3e621541ccf255bfa9652214 , < ba3ba53ce1f76fc372b8f918fece4f9b1e41acd4 (git)
Affected: 182ee45da083db4e3e621541ccf255bfa9652214 , < 94d9ba9f9888b748d4abd2aa1547af56ae85f772 (git)
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Linux Linux Affected: 5.17
Unaffected: 0 , < 5.17 (semver)
Unaffected: 6.4.16 , ≤ 6.4.* (semver)
Unaffected: 6.5.3 , ≤ 6.5.* (semver)
Unaffected: 6.6 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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    "datePublished": "2025-12-08T01:19:23.927Z",
    "dateReserved": "2025-12-08T01:18:04.281Z",
    "dateUpdated": "2026-06-16T15:47:51.661Z",
    "state": "PUBLISHED"
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    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2023-53762\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-06-16T15:46:42.482426Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-06-16T15:46:48.586Z\"}}], \"cna\": {\"title\": \"Bluetooth: hci_sync: Fix UAF in hci_disconnect_all_sync\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"182ee45da083db4e3e621541ccf255bfa9652214\", \"lessThan\": \"a30c074f0b5b7f909a15c978fbc96a29e2f94e42\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"182ee45da083db4e3e621541ccf255bfa9652214\", \"lessThan\": \"ba3ba53ce1f76fc372b8f918fece4f9b1e41acd4\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"182ee45da083db4e3e621541ccf255bfa9652214\", \"lessThan\": \"94d9ba9f9888b748d4abd2aa1547af56ae85f772\", \"versionType\": \"git\"}], \"programFiles\": [\"net/bluetooth/hci_sync.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\": \"6.4.16\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.4.*\"}, {\"status\": \"unaffected\", \"version\": \"6.5.3\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.5.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/bluetooth/hci_sync.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/a30c074f0b5b7f909a15c978fbc96a29e2f94e42\"}, {\"url\": \"https://git.kernel.org/stable/c/ba3ba53ce1f76fc372b8f918fece4f9b1e41acd4\"}, {\"url\": \"https://git.kernel.org/stable/c/94d9ba9f9888b748d4abd2aa1547af56ae85f772\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nBluetooth: hci_sync: Fix UAF in hci_disconnect_all_sync\\n\\nUse-after-free can occur in hci_disconnect_all_sync if a connection is\\ndeleted by concurrent processing of a controller event.\\n\\nTo prevent this the code now tries to iterate over the list backwards\\nto ensure the links are cleanup before its parents, also it no longer\\nrelies on a cursor, instead it always uses the last element since\\nhci_abort_conn_sync is guaranteed to call hci_conn_del.\\n\\nUAF crash log:\\n==================================================================\\nBUG: KASAN: slab-use-after-free in hci_set_powered_sync\\n(net/bluetooth/hci_sync.c:5424) [bluetooth]\\nRead of size 8 at addr ffff888009d9c000 by task kworker/u9:0/124\\n\\nCPU: 0 PID: 124 Comm: kworker/u9:0 Tainted: G        W\\n6.5.0-rc1+ #10\\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS\\n1.16.2-1.fc38 04/01/2014\\nWorkqueue: hci0 hci_cmd_sync_work [bluetooth]\\nCall Trace:\\n \u003cTASK\u003e\\n dump_stack_lvl+0x5b/0x90\\n print_report+0xcf/0x670\\n ? __virt_addr_valid+0xdd/0x160\\n ? hci_set_powered_sync+0x2c9/0x4a0 [bluetooth]\\n kasan_report+0xa6/0xe0\\n ? hci_set_powered_sync+0x2c9/0x4a0 [bluetooth]\\n ? __pfx_set_powered_sync+0x10/0x10 [bluetooth]\\n hci_set_powered_sync+0x2c9/0x4a0 [bluetooth]\\n ? __pfx_hci_set_powered_sync+0x10/0x10 [bluetooth]\\n ? __pfx_lock_release+0x10/0x10\\n ? __pfx_set_powered_sync+0x10/0x10 [bluetooth]\\n hci_cmd_sync_work+0x137/0x220 [bluetooth]\\n process_one_work+0x526/0x9d0\\n ? __pfx_process_one_work+0x10/0x10\\n ? __pfx_do_raw_spin_lock+0x10/0x10\\n ? mark_held_locks+0x1a/0x90\\n worker_thread+0x92/0x630\\n ? __pfx_worker_thread+0x10/0x10\\n kthread+0x196/0x1e0\\n ? __pfx_kthread+0x10/0x10\\n ret_from_fork+0x2c/0x50\\n \u003c/TASK\u003e\\n\\nAllocated by task 1782:\\n kasan_save_stack+0x33/0x60\\n kasan_set_track+0x25/0x30\\n __kasan_kmalloc+0x8f/0xa0\\n hci_conn_add+0xa5/0xa80 [bluetooth]\\n hci_bind_cis+0x881/0x9b0 [bluetooth]\\n iso_connect_cis+0x121/0x520 [bluetooth]\\n iso_sock_connect+0x3f6/0x790 [bluetooth]\\n __sys_connect+0x109/0x130\\n __x64_sys_connect+0x40/0x50\\n do_syscall_64+0x60/0x90\\n entry_SYSCALL_64_after_hwframe+0x6e/0xd8\\n\\nFreed by task 695:\\n kasan_save_stack+0x33/0x60\\n kasan_set_track+0x25/0x30\\n kasan_save_free_info+0x2b/0x50\\n __kasan_slab_free+0x10a/0x180\\n __kmem_cache_free+0x14d/0x2e0\\n device_release+0x5d/0xf0\\n kobject_put+0xdf/0x270\\n hci_disconn_complete_evt+0x274/0x3a0 [bluetooth]\\n hci_event_packet+0x579/0x7e0 [bluetooth]\\n hci_rx_work+0x287/0xaa0 [bluetooth]\\n process_one_work+0x526/0x9d0\\n worker_thread+0x92/0x630\\n kthread+0x196/0x1e0\\n ret_from_fork+0x2c/0x50\\n==================================================================\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.4.16\", \"versionStartIncluding\": \"5.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.5.3\", \"versionStartIncluding\": \"5.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6\", \"versionStartIncluding\": \"5.17\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-11T19:51:11.478Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2023-53762\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-06-16T15:47:51.661Z\", \"dateReserved\": \"2025-12-08T01:18:04.281Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-12-08T01:19:23.927Z\", \"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.

Sightings

Author Source Type Date Other

Nomenclature

  • 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.