CVE-2025-40309 (GCVE-0-2025-40309)

Vulnerability from cvelistv5 – Published: 2025-12-08 00:46 – Updated: 2026-05-11 21:46
VLAI
Title
Bluetooth: SCO: Fix UAF on sco_conn_free
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: SCO: Fix UAF on sco_conn_free BUG: KASAN: slab-use-after-free in sco_conn_free net/bluetooth/sco.c:87 [inline] BUG: KASAN: slab-use-after-free in kref_put include/linux/kref.h:65 [inline] BUG: KASAN: slab-use-after-free in sco_conn_put+0xdd/0x410 net/bluetooth/sco.c:107 Write of size 8 at addr ffff88811cb96b50 by task kworker/u17:4/352 CPU: 1 UID: 0 PID: 352 Comm: kworker/u17:4 Not tainted 6.17.0-rc5-g717368f83676 #4 PREEMPT(voluntary) Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 Workqueue: hci13 hci_cmd_sync_work Call Trace: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x10b/0x170 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x191/0x550 mm/kasan/report.c:482 kasan_report+0xc4/0x100 mm/kasan/report.c:595 sco_conn_free net/bluetooth/sco.c:87 [inline] kref_put include/linux/kref.h:65 [inline] sco_conn_put+0xdd/0x410 net/bluetooth/sco.c:107 sco_connect_cfm+0xb4/0xae0 net/bluetooth/sco.c:1441 hci_connect_cfm include/net/bluetooth/hci_core.h:2082 [inline] hci_conn_failed+0x20a/0x2e0 net/bluetooth/hci_conn.c:1313 hci_conn_unlink+0x55f/0x810 net/bluetooth/hci_conn.c:1121 hci_conn_del+0xb6/0x1110 net/bluetooth/hci_conn.c:1147 hci_abort_conn_sync+0x8c5/0xbb0 net/bluetooth/hci_sync.c:5689 hci_cmd_sync_work+0x281/0x380 net/bluetooth/hci_sync.c:332 process_one_work kernel/workqueue.c:3236 [inline] process_scheduled_works+0x77e/0x1040 kernel/workqueue.c:3319 worker_thread+0xbee/0x1200 kernel/workqueue.c:3400 kthread+0x3c7/0x870 kernel/kthread.c:463 ret_from_fork+0x13a/0x1e0 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> Allocated by task 31370: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x30/0x70 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:388 [inline] __kasan_kmalloc+0x82/0x90 mm/kasan/common.c:405 kasan_kmalloc include/linux/kasan.h:260 [inline] __do_kmalloc_node mm/slub.c:4382 [inline] __kmalloc_noprof+0x22f/0x390 mm/slub.c:4394 kmalloc_noprof include/linux/slab.h:909 [inline] sk_prot_alloc+0xae/0x220 net/core/sock.c:2239 sk_alloc+0x34/0x5a0 net/core/sock.c:2295 bt_sock_alloc+0x3c/0x330 net/bluetooth/af_bluetooth.c:151 sco_sock_alloc net/bluetooth/sco.c:562 [inline] sco_sock_create+0xc0/0x350 net/bluetooth/sco.c:593 bt_sock_create+0x161/0x3b0 net/bluetooth/af_bluetooth.c:135 __sock_create+0x3ad/0x780 net/socket.c:1589 sock_create net/socket.c:1647 [inline] __sys_socket_create net/socket.c:1684 [inline] __sys_socket+0xd5/0x330 net/socket.c:1731 __do_sys_socket net/socket.c:1745 [inline] __se_sys_socket net/socket.c:1743 [inline] __x64_sys_socket+0x7a/0x90 net/socket.c:1743 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xc7/0x240 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 31374: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x30/0x70 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:243 [inline] __kasan_slab_free+0x3d/0x50 mm/kasan/common.c:275 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2428 [inline] slab_free mm/slub.c:4701 [inline] kfree+0x199/0x3b0 mm/slub.c:4900 sk_prot_free net/core/sock.c:2278 [inline] __sk_destruct+0x4aa/0x630 net/core/sock.c:2373 sco_sock_release+0x2ad/0x300 net/bluetooth/sco.c:1333 __sock_release net/socket.c:649 [inline] sock_close+0xb8/0x230 net/socket.c:1439 __fput+0x3d1/0x9e0 fs/file_table.c:468 task_work_run+0x206/0x2a0 kernel/task_work.c:227 get_signal+0x1201/0x1410 kernel/signal.c:2807 arch_do_signal_or_restart+0x34/0x740 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop+0x68/0xc0 kernel/entry/common.c:40 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline] s ---truncated---
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: e6720779ae612a14ac4ba7fe4fd5b27d900d932c , < 391f83547b7b2c63e4b572ab838e10a06cfa4425 (git)
Affected: e6720779ae612a14ac4ba7fe4fd5b27d900d932c , < ecb9a843be4d6fd710d7026e359f21015a062572 (git)
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Linux Linux Affected: 6.13
Unaffected: 0 , < 6.13 (semver)
Unaffected: 6.17.8 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/sco.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "391f83547b7b2c63e4b572ab838e10a06cfa4425",
              "status": "affected",
              "version": "e6720779ae612a14ac4ba7fe4fd5b27d900d932c",
              "versionType": "git"
            },
            {
              "lessThan": "ecb9a843be4d6fd710d7026e359f21015a062572",
              "status": "affected",
              "version": "e6720779ae612a14ac4ba7fe4fd5b27d900d932c",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/sco.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.13"
            },
            {
              "lessThan": "6.13",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.17.8",
                  "versionStartIncluding": "6.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18",
                  "versionStartIncluding": "6.13",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: SCO: Fix UAF on sco_conn_free\n\nBUG: KASAN: slab-use-after-free in sco_conn_free net/bluetooth/sco.c:87 [inline]\nBUG: KASAN: slab-use-after-free in kref_put include/linux/kref.h:65 [inline]\nBUG: KASAN: slab-use-after-free in sco_conn_put+0xdd/0x410\nnet/bluetooth/sco.c:107\nWrite of size 8 at addr ffff88811cb96b50 by task kworker/u17:4/352\n\nCPU: 1 UID: 0 PID: 352 Comm: kworker/u17:4 Not tainted\n6.17.0-rc5-g717368f83676 #4 PREEMPT(voluntary)\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014\nWorkqueue: hci13 hci_cmd_sync_work\nCall Trace:\n \u003cTASK\u003e\n __dump_stack lib/dump_stack.c:94 [inline]\n dump_stack_lvl+0x10b/0x170 lib/dump_stack.c:120\n print_address_description mm/kasan/report.c:378 [inline]\n print_report+0x191/0x550 mm/kasan/report.c:482\n kasan_report+0xc4/0x100 mm/kasan/report.c:595\n sco_conn_free net/bluetooth/sco.c:87 [inline]\n kref_put include/linux/kref.h:65 [inline]\n sco_conn_put+0xdd/0x410 net/bluetooth/sco.c:107\n sco_connect_cfm+0xb4/0xae0 net/bluetooth/sco.c:1441\n hci_connect_cfm include/net/bluetooth/hci_core.h:2082 [inline]\n hci_conn_failed+0x20a/0x2e0 net/bluetooth/hci_conn.c:1313\n hci_conn_unlink+0x55f/0x810 net/bluetooth/hci_conn.c:1121\n hci_conn_del+0xb6/0x1110 net/bluetooth/hci_conn.c:1147\n hci_abort_conn_sync+0x8c5/0xbb0 net/bluetooth/hci_sync.c:5689\n hci_cmd_sync_work+0x281/0x380 net/bluetooth/hci_sync.c:332\n process_one_work kernel/workqueue.c:3236 [inline]\n process_scheduled_works+0x77e/0x1040 kernel/workqueue.c:3319\n worker_thread+0xbee/0x1200 kernel/workqueue.c:3400\n kthread+0x3c7/0x870 kernel/kthread.c:463\n ret_from_fork+0x13a/0x1e0 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 31370:\n kasan_save_stack mm/kasan/common.c:47 [inline]\n kasan_save_track+0x30/0x70 mm/kasan/common.c:68\n poison_kmalloc_redzone mm/kasan/common.c:388 [inline]\n __kasan_kmalloc+0x82/0x90 mm/kasan/common.c:405\n kasan_kmalloc include/linux/kasan.h:260 [inline]\n __do_kmalloc_node mm/slub.c:4382 [inline]\n __kmalloc_noprof+0x22f/0x390 mm/slub.c:4394\n kmalloc_noprof include/linux/slab.h:909 [inline]\n sk_prot_alloc+0xae/0x220 net/core/sock.c:2239\n sk_alloc+0x34/0x5a0 net/core/sock.c:2295\n bt_sock_alloc+0x3c/0x330 net/bluetooth/af_bluetooth.c:151\n sco_sock_alloc net/bluetooth/sco.c:562 [inline]\n sco_sock_create+0xc0/0x350 net/bluetooth/sco.c:593\n bt_sock_create+0x161/0x3b0 net/bluetooth/af_bluetooth.c:135\n __sock_create+0x3ad/0x780 net/socket.c:1589\n sock_create net/socket.c:1647 [inline]\n __sys_socket_create net/socket.c:1684 [inline]\n __sys_socket+0xd5/0x330 net/socket.c:1731\n __do_sys_socket net/socket.c:1745 [inline]\n __se_sys_socket net/socket.c:1743 [inline]\n __x64_sys_socket+0x7a/0x90 net/socket.c:1743\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xc7/0x240 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nFreed by task 31374:\n kasan_save_stack mm/kasan/common.c:47 [inline]\n kasan_save_track+0x30/0x70 mm/kasan/common.c:68\n kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:576\n poison_slab_object mm/kasan/common.c:243 [inline]\n __kasan_slab_free+0x3d/0x50 mm/kasan/common.c:275\n kasan_slab_free include/linux/kasan.h:233 [inline]\n slab_free_hook mm/slub.c:2428 [inline]\n slab_free mm/slub.c:4701 [inline]\n kfree+0x199/0x3b0 mm/slub.c:4900\n sk_prot_free net/core/sock.c:2278 [inline]\n __sk_destruct+0x4aa/0x630 net/core/sock.c:2373\n sco_sock_release+0x2ad/0x300 net/bluetooth/sco.c:1333\n __sock_release net/socket.c:649 [inline]\n sock_close+0xb8/0x230 net/socket.c:1439\n __fput+0x3d1/0x9e0 fs/file_table.c:468\n task_work_run+0x206/0x2a0 kernel/task_work.c:227\n get_signal+0x1201/0x1410 kernel/signal.c:2807\n arch_do_signal_or_restart+0x34/0x740 arch/x86/kernel/signal.c:337\n exit_to_user_mode_loop+0x68/0xc0 kernel/entry/common.c:40\n exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]\n s\n---truncated---"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T21:46:51.814Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/391f83547b7b2c63e4b572ab838e10a06cfa4425"
        },
        {
          "url": "https://git.kernel.org/stable/c/ecb9a843be4d6fd710d7026e359f21015a062572"
        }
      ],
      "title": "Bluetooth: SCO: Fix UAF on sco_conn_free",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40309",
    "datePublished": "2025-12-08T00:46:34.785Z",
    "dateReserved": "2025-04-16T07:20:57.185Z",
    "dateUpdated": "2026-05-11T21:46:51.814Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2025-40309",
      "date": "2026-06-04",
      "epss": "0.00033",
      "percentile": "0.09964"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-40309\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-08T01:16:03.207\",\"lastModified\":\"2026-01-02T16:16:57.547\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nBluetooth: SCO: Fix UAF on sco_conn_free\\n\\nBUG: KASAN: slab-use-after-free in sco_conn_free net/bluetooth/sco.c:87 [inline]\\nBUG: KASAN: slab-use-after-free in kref_put include/linux/kref.h:65 [inline]\\nBUG: KASAN: slab-use-after-free in sco_conn_put+0xdd/0x410\\nnet/bluetooth/sco.c:107\\nWrite of size 8 at addr ffff88811cb96b50 by task kworker/u17:4/352\\n\\nCPU: 1 UID: 0 PID: 352 Comm: kworker/u17:4 Not tainted\\n6.17.0-rc5-g717368f83676 #4 PREEMPT(voluntary)\\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014\\nWorkqueue: hci13 hci_cmd_sync_work\\nCall Trace:\\n \u003cTASK\u003e\\n __dump_stack lib/dump_stack.c:94 [inline]\\n dump_stack_lvl+0x10b/0x170 lib/dump_stack.c:120\\n print_address_description mm/kasan/report.c:378 [inline]\\n print_report+0x191/0x550 mm/kasan/report.c:482\\n kasan_report+0xc4/0x100 mm/kasan/report.c:595\\n sco_conn_free net/bluetooth/sco.c:87 [inline]\\n kref_put include/linux/kref.h:65 [inline]\\n sco_conn_put+0xdd/0x410 net/bluetooth/sco.c:107\\n sco_connect_cfm+0xb4/0xae0 net/bluetooth/sco.c:1441\\n hci_connect_cfm include/net/bluetooth/hci_core.h:2082 [inline]\\n hci_conn_failed+0x20a/0x2e0 net/bluetooth/hci_conn.c:1313\\n hci_conn_unlink+0x55f/0x810 net/bluetooth/hci_conn.c:1121\\n hci_conn_del+0xb6/0x1110 net/bluetooth/hci_conn.c:1147\\n hci_abort_conn_sync+0x8c5/0xbb0 net/bluetooth/hci_sync.c:5689\\n hci_cmd_sync_work+0x281/0x380 net/bluetooth/hci_sync.c:332\\n process_one_work kernel/workqueue.c:3236 [inline]\\n process_scheduled_works+0x77e/0x1040 kernel/workqueue.c:3319\\n worker_thread+0xbee/0x1200 kernel/workqueue.c:3400\\n kthread+0x3c7/0x870 kernel/kthread.c:463\\n ret_from_fork+0x13a/0x1e0 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 31370:\\n kasan_save_stack mm/kasan/common.c:47 [inline]\\n kasan_save_track+0x30/0x70 mm/kasan/common.c:68\\n poison_kmalloc_redzone mm/kasan/common.c:388 [inline]\\n __kasan_kmalloc+0x82/0x90 mm/kasan/common.c:405\\n kasan_kmalloc include/linux/kasan.h:260 [inline]\\n __do_kmalloc_node mm/slub.c:4382 [inline]\\n __kmalloc_noprof+0x22f/0x390 mm/slub.c:4394\\n kmalloc_noprof include/linux/slab.h:909 [inline]\\n sk_prot_alloc+0xae/0x220 net/core/sock.c:2239\\n sk_alloc+0x34/0x5a0 net/core/sock.c:2295\\n bt_sock_alloc+0x3c/0x330 net/bluetooth/af_bluetooth.c:151\\n sco_sock_alloc net/bluetooth/sco.c:562 [inline]\\n sco_sock_create+0xc0/0x350 net/bluetooth/sco.c:593\\n bt_sock_create+0x161/0x3b0 net/bluetooth/af_bluetooth.c:135\\n __sock_create+0x3ad/0x780 net/socket.c:1589\\n sock_create net/socket.c:1647 [inline]\\n __sys_socket_create net/socket.c:1684 [inline]\\n __sys_socket+0xd5/0x330 net/socket.c:1731\\n __do_sys_socket net/socket.c:1745 [inline]\\n __se_sys_socket net/socket.c:1743 [inline]\\n __x64_sys_socket+0x7a/0x90 net/socket.c:1743\\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\\n do_syscall_64+0xc7/0x240 arch/x86/entry/syscall_64.c:94\\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\\n\\nFreed by task 31374:\\n kasan_save_stack mm/kasan/common.c:47 [inline]\\n kasan_save_track+0x30/0x70 mm/kasan/common.c:68\\n kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:576\\n poison_slab_object mm/kasan/common.c:243 [inline]\\n __kasan_slab_free+0x3d/0x50 mm/kasan/common.c:275\\n kasan_slab_free include/linux/kasan.h:233 [inline]\\n slab_free_hook mm/slub.c:2428 [inline]\\n slab_free mm/slub.c:4701 [inline]\\n kfree+0x199/0x3b0 mm/slub.c:4900\\n sk_prot_free net/core/sock.c:2278 [inline]\\n __sk_destruct+0x4aa/0x630 net/core/sock.c:2373\\n sco_sock_release+0x2ad/0x300 net/bluetooth/sco.c:1333\\n __sock_release net/socket.c:649 [inline]\\n sock_close+0xb8/0x230 net/socket.c:1439\\n __fput+0x3d1/0x9e0 fs/file_table.c:468\\n task_work_run+0x206/0x2a0 kernel/task_work.c:227\\n get_signal+0x1201/0x1410 kernel/signal.c:2807\\n arch_do_signal_or_restart+0x34/0x740 arch/x86/kernel/signal.c:337\\n exit_to_user_mode_loop+0x68/0xc0 kernel/entry/common.c:40\\n exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]\\n s\\n---truncated---\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/391f83547b7b2c63e4b572ab838e10a06cfa4425\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ecb9a843be4d6fd710d7026e359f21015a062572\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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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

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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.