{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2023-53046", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T07:18:43.828Z", "datePublished": "2025-05-02T15:55:03.270Z", "dateUpdated": "2026-08-05T09:12:31.608Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T09:12:31.608Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: Fix race condition in hci_cmd_sync_clear\n\nThere is a potential race condition in hci_cmd_sync_work and\nhci_cmd_sync_clear, and could lead to use-after-free. For instance,\nhci_cmd_sync_work is added to the 'req_workqueue' after cancel_work_sync\nThe entry of 'cmd_sync_work_list' may be freed in hci_cmd_sync_clear, and\ncausing kernel panic when it is used in 'hci_cmd_sync_work'.\n\nHere's the call trace:\n\ndump_stack_lvl+0x49/0x63\nprint_report.cold+0x5e/0x5d3\n? hci_cmd_sync_work+0x282/0x320\nkasan_report+0xaa/0x120\n? hci_cmd_sync_work+0x282/0x320\n__asan_report_load8_noabort+0x14/0x20\nhci_cmd_sync_work+0x282/0x320\nprocess_one_work+0x77b/0x11c0\n? _raw_spin_lock_irq+0x8e/0xf0\nworker_thread+0x544/0x1180\n? poll_idle+0x1e0/0x1e0\nkthread+0x285/0x320\n? process_one_work+0x11c0/0x11c0\n? kthread_complete_and_exit+0x30/0x30\nret_from_fork+0x22/0x30\n\n\nAllocated by task 266:\nkasan_save_stack+0x26/0x50\n__kasan_kmalloc+0xae/0xe0\nkmem_cache_alloc_trace+0x191/0x350\nhci_cmd_sync_queue+0x97/0x2b0\nhci_update_passive_scan+0x176/0x1d0\nle_conn_complete_evt+0x1b5/0x1a00\nhci_le_conn_complete_evt+0x234/0x340\nhci_le_meta_evt+0x231/0x4e0\nhci_event_packet+0x4c5/0xf00\nhci_rx_work+0x37d/0x880\nprocess_one_work+0x77b/0x11c0\nworker_thread+0x544/0x1180\nkthread+0x285/0x320\nret_from_fork+0x22/0x30\n\nFreed by task 269:\nkasan_save_stack+0x26/0x50\nkasan_set_track+0x25/0x40\nkasan_set_free_info+0x24/0x40\n____kasan_slab_free+0x176/0x1c0\n__kasan_slab_free+0x12/0x20\nslab_free_freelist_hook+0x95/0x1a0\nkfree+0xba/0x2f0\nhci_cmd_sync_clear+0x14c/0x210\nhci_unregister_dev+0xff/0x440\nvhci_release+0x7b/0xf0\n__fput+0x1f3/0x970\n____fput+0xe/0x20\ntask_work_run+0xd4/0x160\ndo_exit+0x8b0/0x22a0\ndo_group_exit+0xba/0x2a0\nget_signal+0x1e4a/0x25b0\narch_do_signal_or_restart+0x93/0x1f80\nexit_to_user_mode_prepare+0xf5/0x1a0\nsyscall_exit_to_user_mode+0x26/0x50\nret_from_fork+0x15/0x30" } ], "metrics": [ { "cvssV3_1": { "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" }, "scenarios": [ { "lang": "en", "value": "AV:L - The free side requires hci_unregister_dev() (e.g. closing /dev/vhci or driver teardown); an adjacent Bluetooth peer can feed LE events into the allocate path but cannot itself unregister the HCI device, so exploitation is staged via local open/write/close of the transport.\nAC:L - The attacker controls both sides of the race—injecting HCI events (e.g. LE Connection Complete via vhci) that queue cmd_sync work through the HCI_UNREGISTER TOCTOU in hci_cmd_sync_queue, then closing the fd to run hci_cmd_sync_clear—and can retry the open/inject/close cycle until the unprotected list free races with hci_cmd_sync_work.\nPR:L - vhci_open() has no capable() check, so any principal granted /dev/vhci (Android bluetooth uid, containers, permissive udev) can create/destroy virtual controllers and inject frames; this matches prior hci_unregister_dev teardown UAF scores (e.g. CVE-2025-38250, CVE-2024-58241).\nUI:N - The attacker performs device creation, HCI event injection, and teardown from its own processes; no separate victim action is required.\nS:U - The UAF corrupts kernel slab within the host kernel's security authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:H - Use-after-free of the kmalloc'd hci_cmd_sync_work_entry (containing func/data/destroy) allows reclaim/spray of the freed object and arbitrary kernel memory disclosure when hci_cmd_sync_work reads the stale entry.\nI:H - The same UAF exposes sprayable function pointers (entry->func/destroy) invoked from hci_cmd_sync_work, enabling arbitrary write and control-flow hijack after heap grooming.\nA:H - The demonstrated KASAN slab-use-after-free in hci_cmd_sync_work causes kernel oops/panic, and the attacker can repeat the race to deny service." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/bluetooth/hci_sync.c" ], "versions": [ { "version": "6a98e3836fa2077b169f10a35c2ca9952d53f987", "lessThan": "608901a77c945ac15dea23f6098c9882ef19d9f0", "status": "affected", "versionType": "git" }, { "version": "6a98e3836fa2077b169f10a35c2ca9952d53f987", "lessThan": "be586211a3ab40a4f4ca60450e0d31606afc55ec", "status": "affected", "versionType": "git" }, { "version": "6a98e3836fa2077b169f10a35c2ca9952d53f987", "lessThan": "1c66bee492a5fe00ae3fe890bb693bfc99f994c6", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/bluetooth/hci_sync.c" ], "versions": [ { "version": "5.17", "status": "affected" }, { "version": "0", "lessThan": "5.17", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.22", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.2.9", "lessThanOrEqual": "6.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.1.22" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.2.9" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/608901a77c945ac15dea23f6098c9882ef19d9f0" }, { "url": "https://git.kernel.org/stable/c/be586211a3ab40a4f4ca60450e0d31606afc55ec" }, { "url": "https://git.kernel.org/stable/c/1c66bee492a5fe00ae3fe890bb693bfc99f994c6" } ], "title": "Bluetooth: Fix race condition in hci_cmd_sync_clear", "x_generator": { "engine": "bippy-1.2.0" } } } }