CVE-2025-38118 (GCVE-0-2025-38118)
Vulnerability from cvelistv5
Published
2025-07-03 08:35
Modified
2026-08-05 11:59
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: MGMT: Fix UAF on mgmt_remove_adv_monitor_complete This reworks MGMT_OP_REMOVE_ADV_MONITOR to not use mgmt_pending_add to avoid crashes like bellow: ================================================================== BUG: KASAN: slab-use-after-free in mgmt_remove_adv_monitor_complete+0xe5/0x540 net/bluetooth/mgmt.c:5406 Read of size 8 at addr ffff88801c53f318 by task kworker/u5:5/5341 CPU: 0 UID: 0 PID: 5341 Comm: kworker/u5:5 Not tainted 6.15.0-syzkaller-10402-g4cb6c8af8591 #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Workqueue: hci0 hci_cmd_sync_work Call Trace: <TASK> dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:408 [inline] print_report+0xd2/0x2b0 mm/kasan/report.c:521 kasan_report+0x118/0x150 mm/kasan/report.c:634 mgmt_remove_adv_monitor_complete+0xe5/0x540 net/bluetooth/mgmt.c:5406 hci_cmd_sync_work+0x261/0x3a0 net/bluetooth/hci_sync.c:334 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3321 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402 kthread+0x711/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> Allocated by task 5987: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:260 [inline] __kmalloc_cache_noprof+0x230/0x3d0 mm/slub.c:4358 kmalloc_noprof include/linux/slab.h:905 [inline] kzalloc_noprof include/linux/slab.h:1039 [inline] mgmt_pending_new+0x65/0x240 net/bluetooth/mgmt_util.c:252 mgmt_pending_add+0x34/0x120 net/bluetooth/mgmt_util.c:279 remove_adv_monitor+0x103/0x1b0 net/bluetooth/mgmt.c:5454 hci_mgmt_cmd+0x9c9/0xef0 net/bluetooth/hci_sock.c:1719 hci_sock_sendmsg+0x6ca/0xef0 net/bluetooth/hci_sock.c:1839 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x219/0x270 net/socket.c:727 sock_write_iter+0x258/0x330 net/socket.c:1131 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x548/0xa90 fs/read_write.c:686 ksys_write+0x145/0x250 fs/read_write.c:738 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 5989: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x62/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2380 [inline] slab_free mm/slub.c:4642 [inline] kfree+0x18e/0x440 mm/slub.c:4841 mgmt_pending_foreach+0xc9/0x120 net/bluetooth/mgmt_util.c:242 mgmt_index_removed+0x10d/0x2f0 net/bluetooth/mgmt.c:9366 hci_sock_bind+0xbe9/0x1000 net/bluetooth/hci_sock.c:1314 __sys_bind_socket net/socket.c:1810 [inline] __sys_bind+0x2c3/0x3e0 net/socket.c:1841 __do_sys_bind net/socket.c:1846 [inline] __se_sys_bind net/socket.c:1844 [inline] __x64_sys_bind+0x7a/0x90 net/socket.c:1844 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f
References
Impacted products
Vendor Product Version
Linux Linux Version: 66bd095ab5d408af106808cce302406542f70f65
Version: 66bd095ab5d408af106808cce302406542f70f65
Version: 66bd095ab5d408af106808cce302406542f70f65
Version: 66bd095ab5d408af106808cce302406542f70f65
Version: 66bd095ab5d408af106808cce302406542f70f65
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{
  "containers": {
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        "providerMetadata": {
          "dateUpdated": "2025-11-03T17:34:19.342Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
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          "product": "Linux",
          "programFiles": [
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          "programFiles": [
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            "net/bluetooth/hci_core.c",
            "net/bluetooth/mgmt.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.12"
            },
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              "version": "0",
              "versionType": "semver"
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            {
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              "status": "unaffected",
              "version": "6.1.142",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "6.6.94",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.34",
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              "lessThanOrEqual": "6.15.*",
              "status": "unaffected",
              "version": "6.15.3",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "6.16",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "negate": false,
              "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 on mgmt_remove_adv_monitor_complete\n\nThis reworks MGMT_OP_REMOVE_ADV_MONITOR to not use mgmt_pending_add to\navoid crashes like bellow:\n\n==================================================================\nBUG: KASAN: slab-use-after-free in mgmt_remove_adv_monitor_complete+0xe5/0x540 net/bluetooth/mgmt.c:5406\nRead of size 8 at addr ffff88801c53f318 by task kworker/u5:5/5341\n\nCPU: 0 UID: 0 PID: 5341 Comm: kworker/u5:5 Not tainted 6.15.0-syzkaller-10402-g4cb6c8af8591 #0 PREEMPT(full)\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014\nWorkqueue: hci0 hci_cmd_sync_work\nCall Trace:\n \u003cTASK\u003e\n dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120\n print_address_description mm/kasan/report.c:408 [inline]\n print_report+0xd2/0x2b0 mm/kasan/report.c:521\n kasan_report+0x118/0x150 mm/kasan/report.c:634\n mgmt_remove_adv_monitor_complete+0xe5/0x540 net/bluetooth/mgmt.c:5406\n hci_cmd_sync_work+0x261/0x3a0 net/bluetooth/hci_sync.c:334\n process_one_work kernel/workqueue.c:3238 [inline]\n process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3321\n worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402\n kthread+0x711/0x8a0 kernel/kthread.c:464\n ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148\n ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245\n \u003c/TASK\u003e\n\nAllocated by task 5987:\n kasan_save_stack mm/kasan/common.c:47 [inline]\n kasan_save_track+0x3e/0x80 mm/kasan/common.c:68\n poison_kmalloc_redzone mm/kasan/common.c:377 [inline]\n __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:394\n kasan_kmalloc include/linux/kasan.h:260 [inline]\n __kmalloc_cache_noprof+0x230/0x3d0 mm/slub.c:4358\n kmalloc_noprof include/linux/slab.h:905 [inline]\n kzalloc_noprof include/linux/slab.h:1039 [inline]\n mgmt_pending_new+0x65/0x240 net/bluetooth/mgmt_util.c:252\n mgmt_pending_add+0x34/0x120 net/bluetooth/mgmt_util.c:279\n remove_adv_monitor+0x103/0x1b0 net/bluetooth/mgmt.c:5454\n hci_mgmt_cmd+0x9c9/0xef0 net/bluetooth/hci_sock.c:1719\n hci_sock_sendmsg+0x6ca/0xef0 net/bluetooth/hci_sock.c:1839\n sock_sendmsg_nosec net/socket.c:712 [inline]\n __sock_sendmsg+0x219/0x270 net/socket.c:727\n sock_write_iter+0x258/0x330 net/socket.c:1131\n new_sync_write fs/read_write.c:593 [inline]\n vfs_write+0x548/0xa90 fs/read_write.c:686\n ksys_write+0x145/0x250 fs/read_write.c:738\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nFreed by task 5989:\n kasan_save_stack mm/kasan/common.c:47 [inline]\n kasan_save_track+0x3e/0x80 mm/kasan/common.c:68\n kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:576\n poison_slab_object mm/kasan/common.c:247 [inline]\n __kasan_slab_free+0x62/0x70 mm/kasan/common.c:264\n kasan_slab_free include/linux/kasan.h:233 [inline]\n slab_free_hook mm/slub.c:2380 [inline]\n slab_free mm/slub.c:4642 [inline]\n kfree+0x18e/0x440 mm/slub.c:4841\n mgmt_pending_foreach+0xc9/0x120 net/bluetooth/mgmt_util.c:242\n mgmt_index_removed+0x10d/0x2f0 net/bluetooth/mgmt.c:9366\n hci_sock_bind+0xbe9/0x1000 net/bluetooth/hci_sock.c:1314\n __sys_bind_socket net/socket.c:1810 [inline]\n __sys_bind+0x2c3/0x3e0 net/socket.c:1841\n __do_sys_bind net/socket.c:1846 [inline]\n __se_sys_bind net/socket.c:1844 [inline]\n __x64_sys_bind+0x7a/0x90 net/socket.c:1844\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - Both halves of the race are local syscalls \u2014 a `sendmsg()` of MGMT_OP_REMOVE_ADV_MONITOR on an AF_BLUETOOTH/BTPROTO_HCI socket bound to HCI_CHANNEL_CONTROL, and a `bind()` to HCI_CHANNEL_USER (or HCIDEVDOWN) that drives `mgmt_index_removed()`. No over-the-air or remote-peer data participates; a Bluetooth peer cannot inject mgmt commands.\nAC:L - The attacker owns both sides: one thread loops REMOVE_ADV_MONITOR commands (the work is dispatched through the hci_cmd_sync workqueue, widening the window between the unlocked `pending_find()` check and the `cmd-\u003eparam` dereference), while another loops the index-removal path, and the sequence can be retried indefinitely until the free lands mid-callback.\nPR:L - Reaching the opcode requires HCI_SOCK_TRUSTED, granted by CAP_NET_ADMIN \u2014 a delegable capability routinely held by the non-root bluetoothd service account and Android\u0027s sandboxed Bluetooth process, not full init-namespace root, so compromising that already remotely-exposed daemon yields the primitive.\nUI:N - The attacker performs every step itself \u2014 queueing the mgmt command and tearing down/claiming the HCI index \u2014 with no victim action, pairing, or user-initiated Bluetooth operation required.\nS:U - The use-after-free and all downstream corruption stay within the kernel\u0027s own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The freed `mgmt_pending_cmd` is dereferenced for `cmd-\u003eparam` and `cmd-\u003esk` in both `mgmt_remove_adv_monitor_complete()` and the old `mgmt_adv_monitor_removed()`, so a heap-sprayed replacement lets the attacker point `cp` at arbitrary kernel memory whose contents are echoed back through the mgmt event socket in the command-complete reply.\nI:H - `mgmt_pending_remove()` on the already-unlinked object performs a `list_del` unlink write through attacker-sprayable pointers, and the path adds a second `kfree(cmd-\u003eparam)`/`kfree(cmd)` double-free plus a spurious `sock_put()` refcount underflow \u2014 sufficient for controlled writes and control-flow hijack.\nA:H - Even unweaponized the flaw oopses the kernel, as reproduced by syzbot\u0027s KASAN slab-use-after-free in `mgmt_remove_adv_monitor_complete+0xe5/0x540`, and it can be re-triggered in a loop for repeated denial of service."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T11:59:42.682Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/3c9aba9cbdf163e2654be9f82d43ff8a04273962"
        },
        {
          "url": "https://git.kernel.org/stable/c/9f66b6531c2b4e996bb61720ee94adb4b2e8d1be"
        },
        {
          "url": "https://git.kernel.org/stable/c/9df3e5e7f7e4653fd9802878cedc36defc5ef42d"
        },
        {
          "url": "https://git.kernel.org/stable/c/32aa2fbe319f33b0318ec6f4fceb63879771a286"
        },
        {
          "url": "https://git.kernel.org/stable/c/e6ed54e86aae9e4f7286ce8d5c73780f91b48d1c"
        }
      ],
      "title": "Bluetooth: MGMT: Fix UAF on mgmt_remove_adv_monitor_complete",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38118",
    "datePublished": "2025-07-03T08:35:25.992Z",
    "dateReserved": "2025-04-16T04:51:23.986Z",
    "dateUpdated": "2026-08-05T11:59:42.682Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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