Vulnerability-Lookup

FKIE_CVE-2025-39982

Vulnerability from fkie_nvd - Published: 2025-10-15 08:15 - Updated: 2026-07-30 06:24

Severity

8.8 (High) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_event: Fix UAF in hci_acl_create_conn_sync This fixes the following UFA in hci_acl_create_conn_sync where a connection still pending is command submission (conn->state == BT_OPEN) maybe freed, also since this also can happen with the likes of hci_le_create_conn_sync fix it as well: BUG: KASAN: slab-use-after-free in hci_acl_create_conn_sync+0x5ef/0x790 net/bluetooth/hci_sync.c:6861 Write of size 2 at addr ffff88805ffcc038 by task kworker/u11:2/9541 CPU: 1 UID: 0 PID: 9541 Comm: kworker/u11:2 Not tainted 6.16.0-rc7 #3 PREEMPT(full) Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 04/01/2014 Workqueue: hci3 hci_cmd_sync_work Call Trace: <TASK> dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xca/0x230 mm/kasan/report.c:480 kasan_report+0x118/0x150 mm/kasan/report.c:593 hci_acl_create_conn_sync+0x5ef/0x790 net/bluetooth/hci_sync.c:6861 hci_cmd_sync_work+0x210/0x3a0 net/bluetooth/hci_sync.c:332 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3321 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 home/kwqcheii/source/fuzzing/kernel/kasan/linux-6.16-rc7/arch/x86/entry/entry_64.S:245 </TASK> Allocated by task 123736: 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:4359 kmalloc_noprof include/linux/slab.h:905 [inline] kzalloc_noprof include/linux/slab.h:1039 [inline] __hci_conn_add+0x233/0x1b30 net/bluetooth/hci_conn.c:939 hci_conn_add_unset net/bluetooth/hci_conn.c:1051 [inline] hci_connect_acl+0x16c/0x4e0 net/bluetooth/hci_conn.c:1634 pair_device+0x418/0xa70 net/bluetooth/mgmt.c:3556 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+0x54b/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 103680: 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:2381 [inline] slab_free mm/slub.c:4643 [inline] kfree+0x18e/0x440 mm/slub.c:4842 device_release+0x9c/0x1c0 kobject_cleanup lib/kobject.c:689 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x22b/0x480 lib/kobject.c:737 hci_conn_cleanup net/bluetooth/hci_conn.c:175 [inline] hci_conn_del+0x8ff/0xcb0 net/bluetooth/hci_conn.c:1173 hci_conn_complete_evt+0x3c7/0x1040 net/bluetooth/hci_event.c:3199 hci_event_func net/bluetooth/hci_event.c:7477 [inline] hci_event_packet+0x7e0/0x1200 net/bluetooth/hci_event.c:7531 hci_rx_work+0x46a/0xe80 net/bluetooth/hci_core.c:4070 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3321 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 home/kwqcheii/sour ---truncated---

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/484c7d571a3d1b3fd298fa691b660438c4548a53
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/6243bda271a628c48875e3e473206e7f584892ce
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/9e622804d57e2d08f0271200606bd1270f75126f
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/a78fd4fc5694ecb3b97deb2ad9eaebd67b4d2b08
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/bcce99f613163a43de24674b717e7a6c135fc879

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/net/bluetooth/hci_core.h",
            "net/bluetooth/hci_event.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "6243bda271a628c48875e3e473206e7f584892ce",
              "status": "affected",
              "version": "aef2aa4fa98e18ea5d9345bf777ee698c8598728",
              "versionType": "git"
            },
            {
              "lessThan": "bcce99f613163a43de24674b717e7a6c135fc879",
              "status": "affected",
              "version": "aef2aa4fa98e18ea5d9345bf777ee698c8598728",
              "versionType": "git"
            },
            {
              "lessThan": "484c7d571a3d1b3fd298fa691b660438c4548a53",
              "status": "affected",
              "version": "aef2aa4fa98e18ea5d9345bf777ee698c8598728",
              "versionType": "git"
            },
            {
              "lessThan": "a78fd4fc5694ecb3b97deb2ad9eaebd67b4d2b08",
              "status": "affected",
              "version": "aef2aa4fa98e18ea5d9345bf777ee698c8598728",
              "versionType": "git"
            },
            {
              "lessThan": "9e622804d57e2d08f0271200606bd1270f75126f",
              "status": "affected",
              "version": "aef2aa4fa98e18ea5d9345bf777ee698c8598728",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "include/net/bluetooth/hci_core.h",
            "net/bluetooth/hci_event.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.18"
            },
            {
              "lessThan": "5.18",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.155",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.109",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.50",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.16.*",
              "status": "unaffected",
              "version": "6.16.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.17",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_event: Fix UAF in hci_acl_create_conn_sync\n\nThis fixes the following UFA in hci_acl_create_conn_sync where a\nconnection still pending is command submission (conn-\u003estate == BT_OPEN)\nmaybe freed, also since this also can happen with the likes of\nhci_le_create_conn_sync fix it as well:\n\nBUG: KASAN: slab-use-after-free in hci_acl_create_conn_sync+0x5ef/0x790 net/bluetooth/hci_sync.c:6861\nWrite of size 2 at addr ffff88805ffcc038 by task kworker/u11:2/9541\n\nCPU: 1 UID: 0 PID: 9541 Comm: kworker/u11:2 Not tainted 6.16.0-rc7 #3 PREEMPT(full)\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 04/01/2014\nWorkqueue: hci3 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:378 [inline]\n print_report+0xca/0x230 mm/kasan/report.c:480\n kasan_report+0x118/0x150 mm/kasan/report.c:593\n hci_acl_create_conn_sync+0x5ef/0x790 net/bluetooth/hci_sync.c:6861\n hci_cmd_sync_work+0x210/0x3a0 net/bluetooth/hci_sync.c:332\n process_one_work kernel/workqueue.c:3238 [inline]\n process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3321\n worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402\n kthread+0x70e/0x8a0 kernel/kthread.c:464\n ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148\n ret_from_fork_asm+0x1a/0x30 home/kwqcheii/source/fuzzing/kernel/kasan/linux-6.16-rc7/arch/x86/entry/entry_64.S:245\n \u003c/TASK\u003e\n\nAllocated by task 123736:\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:4359\n kmalloc_noprof include/linux/slab.h:905 [inline]\n kzalloc_noprof include/linux/slab.h:1039 [inline]\n __hci_conn_add+0x233/0x1b30 net/bluetooth/hci_conn.c:939\n hci_conn_add_unset net/bluetooth/hci_conn.c:1051 [inline]\n hci_connect_acl+0x16c/0x4e0 net/bluetooth/hci_conn.c:1634\n pair_device+0x418/0xa70 net/bluetooth/mgmt.c:3556\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+0x54b/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 103680:\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:2381 [inline]\n slab_free mm/slub.c:4643 [inline]\n kfree+0x18e/0x440 mm/slub.c:4842\n device_release+0x9c/0x1c0\n kobject_cleanup lib/kobject.c:689 [inline]\n kobject_release lib/kobject.c:720 [inline]\n kref_put include/linux/kref.h:65 [inline]\n kobject_put+0x22b/0x480 lib/kobject.c:737\n hci_conn_cleanup net/bluetooth/hci_conn.c:175 [inline]\n hci_conn_del+0x8ff/0xcb0 net/bluetooth/hci_conn.c:1173\n hci_conn_complete_evt+0x3c7/0x1040 net/bluetooth/hci_event.c:3199\n hci_event_func net/bluetooth/hci_event.c:7477 [inline]\n hci_event_packet+0x7e0/0x1200 net/bluetooth/hci_event.c:7531\n hci_rx_work+0x46a/0xe80 net/bluetooth/hci_core.c:4070\n process_one_work kernel/workqueue.c:3238 [inline]\n process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3321\n worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402\n kthread+0x70e/0x8a0 kernel/kthread.c:464\n ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148\n ret_from_fork_asm+0x1a/0x30 home/kwqcheii/sour\n---truncated---"
    }
  ],
  "id": "CVE-2025-39982",
  "lastModified": "2026-07-30T06:24:04.220",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "ADJACENT_NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2025-10-15T08:15:36.153",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/484c7d571a3d1b3fd298fa691b660438c4548a53"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6243bda271a628c48875e3e473206e7f584892ce"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/9e622804d57e2d08f0271200606bd1270f75126f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a78fd4fc5694ecb3b97deb2ad9eaebd67b4d2b08"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/bcce99f613163a43de24674b717e7a6c135fc879"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Deferred"
}

CVE-2025-39982 (GCVE-0-2025-39982)

Vulnerability from cvelistv5 – Published: 2025-10-15 07:56 – Updated: 2026-08-05 12:06

Title

Bluetooth: hci_event: Fix UAF in hci_acl_create_conn_sync

Summary

Severity

8.8 (High)


                        
                          CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root

References

5 references

URL	Tags
https://git.kernel.org/stable/c/6243bda271a628c48…
https://git.kernel.org/stable/c/bcce99f613163a43d…
https://git.kernel.org/stable/c/484c7d571a3d1b3fd…
https://git.kernel.org/stable/c/a78fd4fc5694ecb3b…
https://git.kernel.org/stable/c/9e622804d57e2d08f…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: aef2aa4fa98e18ea5d9345bf777ee698c8598728 , < 6243bda271a628c48875e3e473206e7f584892ce (git) Affected: aef2aa4fa98e18ea5d9345bf777ee698c8598728 , < bcce99f613163a43de24674b717e7a6c135fc879 (git) Affected: aef2aa4fa98e18ea5d9345bf777ee698c8598728 , < 484c7d571a3d1b3fd298fa691b660438c4548a53 (git) Affected: aef2aa4fa98e18ea5d9345bf777ee698c8598728 , < a78fd4fc5694ecb3b97deb2ad9eaebd67b4d2b08 (git) Affected: aef2aa4fa98e18ea5d9345bf777ee698c8598728 , < 9e622804d57e2d08f0271200606bd1270f75126f (git)
Linux	Linux	Affected: 5.18 Unaffected: 0 , < 5.18 (semver) Unaffected: 6.1.155 , ≤ 6.1.* (semver) Unaffected: 6.6.109 , ≤ 6.6.* (semver) Unaffected: 6.12.50 , ≤ 6.12.* (semver) Unaffected: 6.16.10 , ≤ 6.16.* (semver) Unaffected: 6.17 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/net/bluetooth/hci_core.h",
            "net/bluetooth/hci_event.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "6243bda271a628c48875e3e473206e7f584892ce",
              "status": "affected",
              "version": "aef2aa4fa98e18ea5d9345bf777ee698c8598728",
              "versionType": "git"
            },
            {
              "lessThan": "bcce99f613163a43de24674b717e7a6c135fc879",
              "status": "affected",
              "version": "aef2aa4fa98e18ea5d9345bf777ee698c8598728",
              "versionType": "git"
            },
            {
              "lessThan": "484c7d571a3d1b3fd298fa691b660438c4548a53",
              "status": "affected",
              "version": "aef2aa4fa98e18ea5d9345bf777ee698c8598728",
              "versionType": "git"
            },
            {
              "lessThan": "a78fd4fc5694ecb3b97deb2ad9eaebd67b4d2b08",
              "status": "affected",
              "version": "aef2aa4fa98e18ea5d9345bf777ee698c8598728",
              "versionType": "git"
            },
            {
              "lessThan": "9e622804d57e2d08f0271200606bd1270f75126f",
              "status": "affected",
              "version": "aef2aa4fa98e18ea5d9345bf777ee698c8598728",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "include/net/bluetooth/hci_core.h",
            "net/bluetooth/hci_event.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.18"
            },
            {
              "lessThan": "5.18",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.155",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.109",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.50",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.16.*",
              "status": "unaffected",
              "version": "6.16.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.17",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.155",
                  "versionStartIncluding": "5.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.109",
                  "versionStartIncluding": "5.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.50",
                  "versionStartIncluding": "5.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.16.10",
                  "versionStartIncluding": "5.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.17",
                  "versionStartIncluding": "5.18",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_event: Fix UAF in hci_acl_create_conn_sync\n\nThis fixes the following UFA in hci_acl_create_conn_sync where a\nconnection still pending is command submission (conn-\u003estate == BT_OPEN)\nmaybe freed, also since this also can happen with the likes of\nhci_le_create_conn_sync fix it as well:\n\nBUG: KASAN: slab-use-after-free in hci_acl_create_conn_sync+0x5ef/0x790 net/bluetooth/hci_sync.c:6861\nWrite of size 2 at addr ffff88805ffcc038 by task kworker/u11:2/9541\n\nCPU: 1 UID: 0 PID: 9541 Comm: kworker/u11:2 Not tainted 6.16.0-rc7 #3 PREEMPT(full)\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 04/01/2014\nWorkqueue: hci3 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:378 [inline]\n print_report+0xca/0x230 mm/kasan/report.c:480\n kasan_report+0x118/0x150 mm/kasan/report.c:593\n hci_acl_create_conn_sync+0x5ef/0x790 net/bluetooth/hci_sync.c:6861\n hci_cmd_sync_work+0x210/0x3a0 net/bluetooth/hci_sync.c:332\n process_one_work kernel/workqueue.c:3238 [inline]\n process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3321\n worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402\n kthread+0x70e/0x8a0 kernel/kthread.c:464\n ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148\n ret_from_fork_asm+0x1a/0x30 home/kwqcheii/source/fuzzing/kernel/kasan/linux-6.16-rc7/arch/x86/entry/entry_64.S:245\n \u003c/TASK\u003e\n\nAllocated by task 123736:\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:4359\n kmalloc_noprof include/linux/slab.h:905 [inline]\n kzalloc_noprof include/linux/slab.h:1039 [inline]\n __hci_conn_add+0x233/0x1b30 net/bluetooth/hci_conn.c:939\n hci_conn_add_unset net/bluetooth/hci_conn.c:1051 [inline]\n hci_connect_acl+0x16c/0x4e0 net/bluetooth/hci_conn.c:1634\n pair_device+0x418/0xa70 net/bluetooth/mgmt.c:3556\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+0x54b/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 103680:\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:2381 [inline]\n slab_free mm/slub.c:4643 [inline]\n kfree+0x18e/0x440 mm/slub.c:4842\n device_release+0x9c/0x1c0\n kobject_cleanup lib/kobject.c:689 [inline]\n kobject_release lib/kobject.c:720 [inline]\n kref_put include/linux/kref.h:65 [inline]\n kobject_put+0x22b/0x480 lib/kobject.c:737\n hci_conn_cleanup net/bluetooth/hci_conn.c:175 [inline]\n hci_conn_del+0x8ff/0xcb0 net/bluetooth/hci_conn.c:1173\n hci_conn_complete_evt+0x3c7/0x1040 net/bluetooth/hci_event.c:3199\n hci_event_func net/bluetooth/hci_event.c:7477 [inline]\n hci_event_packet+0x7e0/0x1200 net/bluetooth/hci_event.c:7531\n hci_rx_work+0x46a/0xe80 net/bluetooth/hci_core.c:4070\n process_one_work kernel/workqueue.c:3238 [inline]\n process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3321\n worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402\n kthread+0x70e/0x8a0 kernel/kthread.c:464\n ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148\n ret_from_fork_asm+0x1a/0x30 home/kwqcheii/sour\n---truncated---"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:A - The freeing side of the race is driven by HCI Connection Complete / LE Connection Complete events that a nearby Bluetooth device causes the controller to generate by paging or connecting to the victim and then failing the link. This is Bluetooth radio range, i.e. an adjacent network attacker, not a remote internet attacker.\nAC:L - The attacker drives both halves \u2014 it chooses when to page/connect and when to abort so the error-status Connection Complete lands while the hci_conn is still BT_OPEN, and the window is very wide because hci_acl_create_conn_sync first blocks on an HCI_OP_INQUIRY_CANCEL round-trip while the freeing runs on a different workqueue with no shared lock. The attempt is freely repeatable until it wins.\nPR:N - The adjacent attacker needs no credentials or pairing on the target \u2014 hci_conn_request_evt accepts pages from a connectable/accept-listed device before any authentication, and the outgoing connection it collides with comes from BlueZ auto-reconnect or an unprivileged L2CAP connect() with no capability check.\nUI:N - No victim action is required; background auto-connect to a previously paired device or a listening L2CAP/RFCOMM service creates the pending BT_OPEN hci_conn automatically, and the attacker can induce it by advertising as a device on the victim\u0027s accept list.\nS:U - The corruption is confined to kernel slab memory within the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - After the free the worker reads conn-\u003epkt_type, conn-\u003edst, and conn-\u003econn_timeout out of the reclaimed slab object and emits them in an HCI Create Connection command, and the UAF permits heap grooming for controlled reads of adjacent kernel data.\nI:H - The worker writes into the freed object at fixed offsets \u2014 conn-\u003estate, conn-\u003eout, conn-\u003erole, an attempt counter, link_policy, a refcount increment via hci_conn_get(), and a 3-byte memcpy of the attacker\u0027s own Class-of-Device \u2014 giving a groomable write primitive into a reclaimed kmalloc slot suitable for control-flow hijack.\nA:H - The KASAN report shows a slab-use-after-free write from hci_cmd_sync_work, which reliably oopses or panics the kernel and can be re-triggered by the attacker at will."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:06:50.448Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/6243bda271a628c48875e3e473206e7f584892ce"
        },
        {
          "url": "https://git.kernel.org/stable/c/bcce99f613163a43de24674b717e7a6c135fc879"
        },
        {
          "url": "https://git.kernel.org/stable/c/484c7d571a3d1b3fd298fa691b660438c4548a53"
        },
        {
          "url": "https://git.kernel.org/stable/c/a78fd4fc5694ecb3b97deb2ad9eaebd67b4d2b08"
        },
        {
          "url": "https://git.kernel.org/stable/c/9e622804d57e2d08f0271200606bd1270f75126f"
        }
      ],
      "title": "Bluetooth: hci_event: Fix UAF in hci_acl_create_conn_sync",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-39982",
    "datePublished": "2025-10-15T07:56:02.024Z",
    "dateReserved": "2025-04-16T07:20:57.150Z",
    "dateUpdated": "2026-08-05T12:06:50.448Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.