Vulnerability-Lookup

CVE-2026-64433 (GCVE-0-2026-64433)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:51 – Updated: 2026-07-25 08:51

Title

Bluetooth: MGMT: Fix UAF of hci_conn_params in add_device_complete

Summary

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: MGMT: Fix UAF of hci_conn_params in add_device_complete add_device_complete() runs from the hci_cmd_sync_work kworker, which holds only hci_req_sync_lock and *not* hci_dev_lock. It calls hci_conn_params_lookup() and then dereferences the returned object (params->flags) without taking hci_dev_lock: params = hci_conn_params_lookup(hdev, &cp->addr.bdaddr, le_addr_type(cp->addr.type)); ... device_flags_changed(NULL, hdev, &cp->addr.bdaddr, cp->addr.type, hdev->conn_flags, params ? params->flags : 0); hci_conn_params_lookup() walks hdev->le_conn_params and is documented to require hdev->lock. A concurrent MGMT_OP_REMOVE_DEVICE (remove_device()), which does run under hci_dev_lock, can call hci_conn_params_free() to list_del() and kfree() the very object the lookup returned, so the subsequent params->flags read touches freed memory [0]. Hold hci_dev_lock() across the hci_conn_params_lookup() and the read of params->flags (and the matching event emission) so the lookup result cannot be freed by a concurrent remove_device() before it is used, honouring the locking contract of hci_conn_params_lookup(). [0]: (trailing page/memory-state dump trimmed) BUG: KASAN: slab-use-after-free in add_device_complete+0x358/0x3d8 net/bluetooth/mgmt.c:7671 Read of size 1 at addr ffff000017ab26c1 by task kworker/u9:8/388 CPU: 1 UID: 0 PID: 388 Comm: kworker/u9:8 Not tainted 7.0.11 #20 PREEMPT Hardware name: linux,dummy-virt (DT) Workqueue: hci0 hci_cmd_sync_work Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C) __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0xb4/0xd4 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x118/0x5d8 mm/kasan/report.c:482 kasan_report+0xb0/0xf4 mm/kasan/report.c:595 __asan_report_load1_noabort+0x20/0x2c mm/kasan/report_generic.c:378 add_device_complete+0x358/0x3d8 net/bluetooth/mgmt.c:7671 hci_cmd_sync_work+0x14c/0x240 net/bluetooth/hci_sync.c:334 process_one_work+0x628/0xd38 kernel/workqueue.c:3289 process_scheduled_works kernel/workqueue.c:3372 [inline] worker_thread+0x7a8/0xac0 kernel/workqueue.c:3453 kthread+0x39c/0x444 kernel/kthread.c:436 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 Allocated by task 3401: kasan_save_stack+0x3c/0x64 mm/kasan/common.c:57 kasan_save_track+0x20/0x3c mm/kasan/common.c:78 kasan_save_alloc_info+0x40/0x54 mm/kasan/generic.c:570 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0xd4/0xd8 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __kmalloc_cache_noprof+0x1b0/0x458 mm/slub.c:5385 kmalloc_noprof include/linux/slab.h:950 [inline] kzalloc_noprof include/linux/slab.h:1188 [inline] hci_conn_params_add+0x10c/0x4b0 net/bluetooth/hci_core.c:2279 hci_conn_params_set net/bluetooth/mgmt.c:5162 [inline] add_device+0x5b4/0xa54 net/bluetooth/mgmt.c:7755 hci_mgmt_cmd net/bluetooth/hci_sock.c:1721 [inline] hci_sock_sendmsg+0x10b4/0x1dd0 net/bluetooth/hci_sock.c:1841 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg+0xe0/0x128 net/socket.c:742 sock_write_iter+0x250/0x390 net/socket.c:1195 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x66c/0xab0 fs/read_write.c:688 ksys_write+0x1fc/0x24c fs/read_write.c:740 __do_sys_write fs/read_write.c:751 [inline] __se_sys_write fs/read_write.c:748 [inline] __arm64_sys_write+0x70/0xa4 fs/read_write.c:748 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x84/0x2a8 arch/arm64/kernel/syscall.c:49 el0_svc_common.constprop.0+0xe4/0x294 arch/arm64/kernel/syscall.c:132 do_el0_svc+0x44/0x5c arch/arm64/kernel/syscall.c:151 el0_svc+0x38/0xac arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0xa0/0xe4 arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 Freed by task 3740: kasan_save_stack+0x3c/0x64 ---truncated---

Severity

No CVSS data available.

Assigner

Linux

References

5 references

URL	Tags
https://git.kernel.org/stable/c/caed4a96d55757c13…
https://git.kernel.org/stable/c/e4369e4e970f3fa46…
https://git.kernel.org/stable/c/b346efa825b5e4386…
https://git.kernel.org/stable/c/9531014c60c804e16…
https://git.kernel.org/stable/c/fa85d985f614bc3fe…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 31492b8386e5a243df26ca4a9421f6b041f414d5 , < caed4a96d55757c139a899744657c032b6186665 (git) Affected: 28826a89fdfd49f3291980c2e68b8a7c5d55e199 , < e4369e4e970f3fa4676b76be14c1d315c87f22b6 (git) Affected: 1e2e3044c1bc64a64aa0eaf7c17f7832c26c9775 , < b346efa825b5e4386f19bc63f81141652d496ec4 (git) Affected: 1e2e3044c1bc64a64aa0eaf7c17f7832c26c9775 , < 9531014c60c804e16099885d4a98aedcf31bce8d (git) Affected: 1e2e3044c1bc64a64aa0eaf7c17f7832c26c9775 , < fa85d985f614bc3feb343000f14a1072e99b0df1 (git) Affected: 7e370545b8bdb54ed7f1ae485d6d24d3b62a0b53 (git) Affected: 6.6.92 , < 6.6.145 (semver) Affected: 6.12.30 , < 6.12.96 (semver) Affected: 6.14.8 , < 6.15 (semver)
Linux	Linux	Affected: 6.15 Unaffected: 0 , < 6.15 (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.96 , ≤ 6.12.* (semver) Unaffected: 6.18.39 , ≤ 6.18.* (semver) Unaffected: 7.1.4 , ≤ 7.1.* (semver) Unaffected: 7.2-rc3 , ≤ * (original_commit_for_fix)

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{
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          "programFiles": [
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              "status": "unaffected",
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              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
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              "version": "7.2-rc3",
              "versionType": "original_commit_for_fix"
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              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: MGMT: Fix UAF of hci_conn_params in add_device_complete\n\nadd_device_complete() runs from the hci_cmd_sync_work kworker, which\nholds only hci_req_sync_lock and *not* hci_dev_lock.  It calls\nhci_conn_params_lookup() and then dereferences the returned object\n(params-\u003eflags) without taking hci_dev_lock:\n\n\tparams = hci_conn_params_lookup(hdev, \u0026cp-\u003eaddr.bdaddr,\n\t\t\t\t\tle_addr_type(cp-\u003eaddr.type));\n\t...\n\tdevice_flags_changed(NULL, hdev, \u0026cp-\u003eaddr.bdaddr,\n\t\t\t     cp-\u003eaddr.type, hdev-\u003econn_flags,\n\t\t\t     params ? params-\u003eflags : 0);\n\nhci_conn_params_lookup() walks hdev-\u003ele_conn_params and is documented to\nrequire hdev-\u003elock.  A concurrent MGMT_OP_REMOVE_DEVICE\n(remove_device()), which does run under hci_dev_lock, can call\nhci_conn_params_free() to list_del() and kfree() the very object the\nlookup returned, so the subsequent params-\u003eflags read touches freed\nmemory [0].\n\nHold hci_dev_lock() across the hci_conn_params_lookup() and the read of\nparams-\u003eflags (and the matching event emission) so the lookup result\ncannot be freed by a concurrent remove_device() before it is used,\nhonouring the locking contract of hci_conn_params_lookup().\n\n[0]: (trailing page/memory-state dump trimmed)\nBUG: KASAN: slab-use-after-free in add_device_complete+0x358/0x3d8 net/bluetooth/mgmt.c:7671\nRead of size 1 at addr ffff000017ab26c1 by task kworker/u9:8/388\n\nCPU: 1 UID: 0 PID: 388 Comm: kworker/u9:8 Not tainted 7.0.11 #20 PREEMPT\nHardware name: linux,dummy-virt (DT)\nWorkqueue: hci0 hci_cmd_sync_work\nCall trace:\n show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C)\n __dump_stack lib/dump_stack.c:94 [inline]\n dump_stack_lvl+0xb4/0xd4 lib/dump_stack.c:120\n print_address_description mm/kasan/report.c:378 [inline]\n print_report+0x118/0x5d8 mm/kasan/report.c:482\n kasan_report+0xb0/0xf4 mm/kasan/report.c:595\n __asan_report_load1_noabort+0x20/0x2c mm/kasan/report_generic.c:378\n add_device_complete+0x358/0x3d8 net/bluetooth/mgmt.c:7671\n hci_cmd_sync_work+0x14c/0x240 net/bluetooth/hci_sync.c:334\n process_one_work+0x628/0xd38 kernel/workqueue.c:3289\n process_scheduled_works kernel/workqueue.c:3372 [inline]\n worker_thread+0x7a8/0xac0 kernel/workqueue.c:3453\n kthread+0x39c/0x444 kernel/kthread.c:436\n ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860\n\nAllocated by task 3401:\n kasan_save_stack+0x3c/0x64 mm/kasan/common.c:57\n kasan_save_track+0x20/0x3c mm/kasan/common.c:78\n kasan_save_alloc_info+0x40/0x54 mm/kasan/generic.c:570\n poison_kmalloc_redzone mm/kasan/common.c:398 [inline]\n __kasan_kmalloc+0xd4/0xd8 mm/kasan/common.c:415\n kasan_kmalloc include/linux/kasan.h:263 [inline]\n __kmalloc_cache_noprof+0x1b0/0x458 mm/slub.c:5385\n kmalloc_noprof include/linux/slab.h:950 [inline]\n kzalloc_noprof include/linux/slab.h:1188 [inline]\n hci_conn_params_add+0x10c/0x4b0 net/bluetooth/hci_core.c:2279\n hci_conn_params_set net/bluetooth/mgmt.c:5162 [inline]\n add_device+0x5b4/0xa54 net/bluetooth/mgmt.c:7755\n hci_mgmt_cmd net/bluetooth/hci_sock.c:1721 [inline]\n hci_sock_sendmsg+0x10b4/0x1dd0 net/bluetooth/hci_sock.c:1841\n sock_sendmsg_nosec net/socket.c:727 [inline]\n __sock_sendmsg+0xe0/0x128 net/socket.c:742\n sock_write_iter+0x250/0x390 net/socket.c:1195\n new_sync_write fs/read_write.c:595 [inline]\n vfs_write+0x66c/0xab0 fs/read_write.c:688\n ksys_write+0x1fc/0x24c fs/read_write.c:740\n __do_sys_write fs/read_write.c:751 [inline]\n __se_sys_write fs/read_write.c:748 [inline]\n __arm64_sys_write+0x70/0xa4 fs/read_write.c:748\n __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]\n invoke_syscall+0x84/0x2a8 arch/arm64/kernel/syscall.c:49\n el0_svc_common.constprop.0+0xe4/0x294 arch/arm64/kernel/syscall.c:132\n do_el0_svc+0x44/0x5c arch/arm64/kernel/syscall.c:151\n el0_svc+0x38/0xac arch/arm64/kernel/entry-common.c:724\n el0t_64_sync_handler+0xa0/0xe4 arch/arm64/kernel/entry-common.c:743\n el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596\n\nFreed by task 3740:\n kasan_save_stack+0x3c/0x64 \n---truncated---"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-25T08:51:08.432Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/caed4a96d55757c139a899744657c032b6186665"
        },
        {
          "url": "https://git.kernel.org/stable/c/e4369e4e970f3fa4676b76be14c1d315c87f22b6"
        },
        {
          "url": "https://git.kernel.org/stable/c/b346efa825b5e4386f19bc63f81141652d496ec4"
        },
        {
          "url": "https://git.kernel.org/stable/c/9531014c60c804e16099885d4a98aedcf31bce8d"
        },
        {
          "url": "https://git.kernel.org/stable/c/fa85d985f614bc3feb343000f14a1072e99b0df1"
        }
      ],
      "title": "Bluetooth: MGMT: Fix UAF of hci_conn_params in add_device_complete",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64433",
    "datePublished": "2026-07-25T08:51:08.432Z",
    "dateReserved": "2026-07-19T15:36:31.787Z",
    "dateUpdated": "2026-07-25T08:51:08.432Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-64433",
      "date": "2026-07-25",
      "epss": "0.00209",
      "percentile": "0.11165"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-64433\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-07-25T10:17:27.567\",\"lastModified\":\"2026-07-25T10:17:27.567\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nBluetooth: MGMT: Fix UAF of hci_conn_params in add_device_complete\\n\\nadd_device_complete() runs from the hci_cmd_sync_work kworker, which\\nholds only hci_req_sync_lock and *not* hci_dev_lock.  It calls\\nhci_conn_params_lookup() and then dereferences the returned object\\n(params-\u003eflags) without taking hci_dev_lock:\\n\\n\\tparams = hci_conn_params_lookup(hdev, \u0026cp-\u003eaddr.bdaddr,\\n\\t\\t\\t\\t\\tle_addr_type(cp-\u003eaddr.type));\\n\\t...\\n\\tdevice_flags_changed(NULL, hdev, \u0026cp-\u003eaddr.bdaddr,\\n\\t\\t\\t     cp-\u003eaddr.type, hdev-\u003econn_flags,\\n\\t\\t\\t     params ? params-\u003eflags : 0);\\n\\nhci_conn_params_lookup() walks hdev-\u003ele_conn_params and is documented to\\nrequire hdev-\u003elock.  A concurrent MGMT_OP_REMOVE_DEVICE\\n(remove_device()), which does run under hci_dev_lock, can call\\nhci_conn_params_free() to list_del() and kfree() the very object the\\nlookup returned, so the subsequent params-\u003eflags read touches freed\\nmemory [0].\\n\\nHold hci_dev_lock() across the hci_conn_params_lookup() and the read of\\nparams-\u003eflags (and the matching event emission) so the lookup result\\ncannot be freed by a concurrent remove_device() before it is used,\\nhonouring the locking contract of hci_conn_params_lookup().\\n\\n[0]: (trailing page/memory-state dump trimmed)\\nBUG: KASAN: slab-use-after-free in add_device_complete+0x358/0x3d8 net/bluetooth/mgmt.c:7671\\nRead of size 1 at addr ffff000017ab26c1 by task kworker/u9:8/388\\n\\nCPU: 1 UID: 0 PID: 388 Comm: kworker/u9:8 Not tainted 7.0.11 #20 PREEMPT\\nHardware name: linux,dummy-virt (DT)\\nWorkqueue: hci0 hci_cmd_sync_work\\nCall trace:\\n show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C)\\n __dump_stack lib/dump_stack.c:94 [inline]\\n dump_stack_lvl+0xb4/0xd4 lib/dump_stack.c:120\\n print_address_description mm/kasan/report.c:378 [inline]\\n print_report+0x118/0x5d8 mm/kasan/report.c:482\\n kasan_report+0xb0/0xf4 mm/kasan/report.c:595\\n __asan_report_load1_noabort+0x20/0x2c mm/kasan/report_generic.c:378\\n add_device_complete+0x358/0x3d8 net/bluetooth/mgmt.c:7671\\n hci_cmd_sync_work+0x14c/0x240 net/bluetooth/hci_sync.c:334\\n process_one_work+0x628/0xd38 kernel/workqueue.c:3289\\n process_scheduled_works kernel/workqueue.c:3372 [inline]\\n worker_thread+0x7a8/0xac0 kernel/workqueue.c:3453\\n kthread+0x39c/0x444 kernel/kthread.c:436\\n ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860\\n\\nAllocated by task 3401:\\n kasan_save_stack+0x3c/0x64 mm/kasan/common.c:57\\n kasan_save_track+0x20/0x3c mm/kasan/common.c:78\\n kasan_save_alloc_info+0x40/0x54 mm/kasan/generic.c:570\\n poison_kmalloc_redzone mm/kasan/common.c:398 [inline]\\n __kasan_kmalloc+0xd4/0xd8 mm/kasan/common.c:415\\n kasan_kmalloc include/linux/kasan.h:263 [inline]\\n __kmalloc_cache_noprof+0x1b0/0x458 mm/slub.c:5385\\n kmalloc_noprof include/linux/slab.h:950 [inline]\\n kzalloc_noprof include/linux/slab.h:1188 [inline]\\n hci_conn_params_add+0x10c/0x4b0 net/bluetooth/hci_core.c:2279\\n hci_conn_params_set net/bluetooth/mgmt.c:5162 [inline]\\n add_device+0x5b4/0xa54 net/bluetooth/mgmt.c:7755\\n hci_mgmt_cmd net/bluetooth/hci_sock.c:1721 [inline]\\n hci_sock_sendmsg+0x10b4/0x1dd0 net/bluetooth/hci_sock.c:1841\\n sock_sendmsg_nosec net/socket.c:727 [inline]\\n __sock_sendmsg+0xe0/0x128 net/socket.c:742\\n sock_write_iter+0x250/0x390 net/socket.c:1195\\n new_sync_write fs/read_write.c:595 [inline]\\n vfs_write+0x66c/0xab0 fs/read_write.c:688\\n ksys_write+0x1fc/0x24c fs/read_write.c:740\\n __do_sys_write fs/read_write.c:751 [inline]\\n __se_sys_write fs/read_write.c:748 [inline]\\n __arm64_sys_write+0x70/0xa4 fs/read_write.c:748\\n __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]\\n invoke_syscall+0x84/0x2a8 arch/arm64/kernel/syscall.c:49\\n el0_svc_common.constprop.0+0xe4/0x294 arch/arm64/kernel/syscall.c:132\\n do_el0_svc+0x44/0x5c arch/arm64/kernel/syscall.c:151\\n el0_svc+0x38/0xac arch/arm64/kernel/entry-common.c:724\\n el0t_64_sync_handler+0xa0/0xe4 arch/arm64/kernel/entry-common.c:743\\n el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596\\n\\nFreed by task 3740:\\n kasan_save_stack+0x3c/0x64 \\n---truncated---\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/bluetooth/mgmt.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"31492b8386e5a243df26ca4a9421f6b041f414d5\",\"lessThan\":\"caed4a96d55757c139a899744657c032b6186665\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"28826a89fdfd49f3291980c2e68b8a7c5d55e199\",\"lessThan\":\"e4369e4e970f3fa4676b76be14c1d315c87f22b6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1e2e3044c1bc64a64aa0eaf7c17f7832c26c9775\",\"lessThan\":\"b346efa825b5e4386f19bc63f81141652d496ec4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1e2e3044c1bc64a64aa0eaf7c17f7832c26c9775\",\"lessThan\":\"9531014c60c804e16099885d4a98aedcf31bce8d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1e2e3044c1bc64a64aa0eaf7c17f7832c26c9775\",\"lessThan\":\"fa85d985f614bc3feb343000f14a1072e99b0df1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7e370545b8bdb54ed7f1ae485d6d24d3b62a0b53\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6.6.92\",\"lessThan\":\"6.6.145\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.12.30\",\"lessThan\":\"6.12.96\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.14.8\",\"lessThan\":\"6.15\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/bluetooth/mgmt.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.15\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.15\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.96\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.39\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.4\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2-rc3\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/9531014c60c804e16099885d4a98aedcf31bce8d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b346efa825b5e4386f19bc63f81141652d496ec4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/caed4a96d55757c139a899744657c032b6186665\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e4369e4e970f3fa4676b76be14c1d315c87f22b6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fa85d985f614bc3feb343000f14a1072e99b0df1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-07-25T15:59:26Z",
      "cve": "CVE-2026-64433",
      "id": "CVE-2026-64433",
      "initial_release_date": "2026-07-25T15:59:26Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64433",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64433.json",
      "version": "2"
    }
  }
}

GHSA-G2V2-WH7X-5CMC

Vulnerability from github – Published: 2026-07-25 12:31 – Updated: 2026-07-25 12:31

Details

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: MGMT: Fix UAF of hci_conn_params in add_device_complete

add_device_complete() runs from the hci_cmd_sync_work kworker, which holds only hci_req_sync_lock and not hci_dev_lock. It calls hci_conn_params_lookup() and then dereferences the returned object (params->flags) without taking hci_dev_lock:

params = hci_conn_params_lookup(hdev, &cp->addr.bdaddr,
                le_addr_type(cp->addr.type));
...
device_flags_changed(NULL, hdev, &cp->addr.bdaddr,
             cp->addr.type, hdev->conn_flags,
             params ? params->flags : 0);

hci_conn_params_lookup() walks hdev->le_conn_params and is documented to require hdev->lock. A concurrent MGMT_OP_REMOVE_DEVICE (remove_device()), which does run under hci_dev_lock, can call hci_conn_params_free() to list_del() and kfree() the very object the lookup returned, so the subsequent params->flags read touches freed memory [0].

Hold hci_dev_lock() across the hci_conn_params_lookup() and the read of params->flags (and the matching event emission) so the lookup result cannot be freed by a concurrent remove_device() before it is used, honouring the locking contract of hci_conn_params_lookup().

[0]: (trailing page/memory-state dump trimmed) BUG: KASAN: slab-use-after-free in add_device_complete+0x358/0x3d8 net/bluetooth/mgmt.c:7671 Read of size 1 at addr ffff000017ab26c1 by task kworker/u9:8/388

CPU: 1 UID: 0 PID: 388 Comm: kworker/u9:8 Not tainted 7.0.11 #20 PREEMPT Hardware name: linux,dummy-virt (DT) Workqueue: hci0 hci_cmd_sync_work Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C) __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0xb4/0xd4 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x118/0x5d8 mm/kasan/report.c:482 kasan_report+0xb0/0xf4 mm/kasan/report.c:595 __asan_report_load1_noabort+0x20/0x2c mm/kasan/report_generic.c:378 add_device_complete+0x358/0x3d8 net/bluetooth/mgmt.c:7671 hci_cmd_sync_work+0x14c/0x240 net/bluetooth/hci_sync.c:334 process_one_work+0x628/0xd38 kernel/workqueue.c:3289 process_scheduled_works kernel/workqueue.c:3372 [inline] worker_thread+0x7a8/0xac0 kernel/workqueue.c:3453 kthread+0x39c/0x444 kernel/kthread.c:436 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860

Allocated by task 3401: kasan_save_stack+0x3c/0x64 mm/kasan/common.c:57 kasan_save_track+0x20/0x3c mm/kasan/common.c:78 kasan_save_alloc_info+0x40/0x54 mm/kasan/generic.c:570 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0xd4/0xd8 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __kmalloc_cache_noprof+0x1b0/0x458 mm/slub.c:5385 kmalloc_noprof include/linux/slab.h:950 [inline] kzalloc_noprof include/linux/slab.h:1188 [inline] hci_conn_params_add+0x10c/0x4b0 net/bluetooth/hci_core.c:2279 hci_conn_params_set net/bluetooth/mgmt.c:5162 [inline] add_device+0x5b4/0xa54 net/bluetooth/mgmt.c:7755 hci_mgmt_cmd net/bluetooth/hci_sock.c:1721 [inline] hci_sock_sendmsg+0x10b4/0x1dd0 net/bluetooth/hci_sock.c:1841 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg+0xe0/0x128 net/socket.c:742 sock_write_iter+0x250/0x390 net/socket.c:1195 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x66c/0xab0 fs/read_write.c:688 ksys_write+0x1fc/0x24c fs/read_write.c:740 __do_sys_write fs/read_write.c:751 [inline] __se_sys_write fs/read_write.c:748 [inline] __arm64_sys_write+0x70/0xa4 fs/read_write.c:748 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x84/0x2a8 arch/arm64/kernel/syscall.c:49 el0_svc_common.constprop.0+0xe4/0x294 arch/arm64/kernel/syscall.c:132 do_el0_svc+0x44/0x5c arch/arm64/kernel/syscall.c:151 el0_svc+0x38/0xac arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0xa0/0xe4 arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596

Freed by task 3740: kasan_save_stack+0x3c/0x64 ---truncated---

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{
  "affected": [],
  "aliases": [
    "CVE-2026-64433"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-25T10:17:27Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: MGMT: Fix UAF of hci_conn_params in add_device_complete\n\nadd_device_complete() runs from the hci_cmd_sync_work kworker, which\nholds only hci_req_sync_lock and *not* hci_dev_lock.  It calls\nhci_conn_params_lookup() and then dereferences the returned object\n(params-\u003eflags) without taking hci_dev_lock:\n\n\tparams = hci_conn_params_lookup(hdev, \u0026cp-\u003eaddr.bdaddr,\n\t\t\t\t\tle_addr_type(cp-\u003eaddr.type));\n\t...\n\tdevice_flags_changed(NULL, hdev, \u0026cp-\u003eaddr.bdaddr,\n\t\t\t     cp-\u003eaddr.type, hdev-\u003econn_flags,\n\t\t\t     params ? params-\u003eflags : 0);\n\nhci_conn_params_lookup() walks hdev-\u003ele_conn_params and is documented to\nrequire hdev-\u003elock.  A concurrent MGMT_OP_REMOVE_DEVICE\n(remove_device()), which does run under hci_dev_lock, can call\nhci_conn_params_free() to list_del() and kfree() the very object the\nlookup returned, so the subsequent params-\u003eflags read touches freed\nmemory [0].\n\nHold hci_dev_lock() across the hci_conn_params_lookup() and the read of\nparams-\u003eflags (and the matching event emission) so the lookup result\ncannot be freed by a concurrent remove_device() before it is used,\nhonouring the locking contract of hci_conn_params_lookup().\n\n[0]: (trailing page/memory-state dump trimmed)\nBUG: KASAN: slab-use-after-free in add_device_complete+0x358/0x3d8 net/bluetooth/mgmt.c:7671\nRead of size 1 at addr ffff000017ab26c1 by task kworker/u9:8/388\n\nCPU: 1 UID: 0 PID: 388 Comm: kworker/u9:8 Not tainted 7.0.11 #20 PREEMPT\nHardware name: linux,dummy-virt (DT)\nWorkqueue: hci0 hci_cmd_sync_work\nCall trace:\n show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C)\n __dump_stack lib/dump_stack.c:94 [inline]\n dump_stack_lvl+0xb4/0xd4 lib/dump_stack.c:120\n print_address_description mm/kasan/report.c:378 [inline]\n print_report+0x118/0x5d8 mm/kasan/report.c:482\n kasan_report+0xb0/0xf4 mm/kasan/report.c:595\n __asan_report_load1_noabort+0x20/0x2c mm/kasan/report_generic.c:378\n add_device_complete+0x358/0x3d8 net/bluetooth/mgmt.c:7671\n hci_cmd_sync_work+0x14c/0x240 net/bluetooth/hci_sync.c:334\n process_one_work+0x628/0xd38 kernel/workqueue.c:3289\n process_scheduled_works kernel/workqueue.c:3372 [inline]\n worker_thread+0x7a8/0xac0 kernel/workqueue.c:3453\n kthread+0x39c/0x444 kernel/kthread.c:436\n ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860\n\nAllocated by task 3401:\n kasan_save_stack+0x3c/0x64 mm/kasan/common.c:57\n kasan_save_track+0x20/0x3c mm/kasan/common.c:78\n kasan_save_alloc_info+0x40/0x54 mm/kasan/generic.c:570\n poison_kmalloc_redzone mm/kasan/common.c:398 [inline]\n __kasan_kmalloc+0xd4/0xd8 mm/kasan/common.c:415\n kasan_kmalloc include/linux/kasan.h:263 [inline]\n __kmalloc_cache_noprof+0x1b0/0x458 mm/slub.c:5385\n kmalloc_noprof include/linux/slab.h:950 [inline]\n kzalloc_noprof include/linux/slab.h:1188 [inline]\n hci_conn_params_add+0x10c/0x4b0 net/bluetooth/hci_core.c:2279\n hci_conn_params_set net/bluetooth/mgmt.c:5162 [inline]\n add_device+0x5b4/0xa54 net/bluetooth/mgmt.c:7755\n hci_mgmt_cmd net/bluetooth/hci_sock.c:1721 [inline]\n hci_sock_sendmsg+0x10b4/0x1dd0 net/bluetooth/hci_sock.c:1841\n sock_sendmsg_nosec net/socket.c:727 [inline]\n __sock_sendmsg+0xe0/0x128 net/socket.c:742\n sock_write_iter+0x250/0x390 net/socket.c:1195\n new_sync_write fs/read_write.c:595 [inline]\n vfs_write+0x66c/0xab0 fs/read_write.c:688\n ksys_write+0x1fc/0x24c fs/read_write.c:740\n __do_sys_write fs/read_write.c:751 [inline]\n __se_sys_write fs/read_write.c:748 [inline]\n __arm64_sys_write+0x70/0xa4 fs/read_write.c:748\n __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]\n invoke_syscall+0x84/0x2a8 arch/arm64/kernel/syscall.c:49\n el0_svc_common.constprop.0+0xe4/0x294 arch/arm64/kernel/syscall.c:132\n do_el0_svc+0x44/0x5c arch/arm64/kernel/syscall.c:151\n el0_svc+0x38/0xac arch/arm64/kernel/entry-common.c:724\n el0t_64_sync_handler+0xa0/0xe4 arch/arm64/kernel/entry-common.c:743\n el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596\n\nFreed by task 3740:\n kasan_save_stack+0x3c/0x64 \n---truncated---",
  "id": "GHSA-g2v2-wh7x-5cmc",
  "modified": "2026-07-25T12:31:35Z",
  "published": "2026-07-25T12:31:35Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64433"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9531014c60c804e16099885d4a98aedcf31bce8d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b346efa825b5e4386f19bc63f81141652d496ec4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/caed4a96d55757c139a899744657c032b6186665"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e4369e4e970f3fa4676b76be14c1d315c87f22b6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fa85d985f614bc3feb343000f14a1072e99b0df1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

CVE-2026-64433 (GCVE-0-2026-64433)

GHSA-G2V2-WH7X-5CMC

Tags

Sightings

Nomenclature