CVE-2025-38473 (GCVE-0-2025-38473)

Vulnerability from cvelistv5 – Published: 2025-07-28 11:21 – Updated: 2025-11-03 17:38
VLAI?
Title
Bluetooth: Fix null-ptr-deref in l2cap_sock_resume_cb()
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: Fix null-ptr-deref in l2cap_sock_resume_cb() syzbot reported null-ptr-deref in l2cap_sock_resume_cb(). [0] l2cap_sock_resume_cb() has a similar problem that was fixed by commit 1bff51ea59a9 ("Bluetooth: fix use-after-free error in lock_sock_nested()"). Since both l2cap_sock_kill() and l2cap_sock_resume_cb() are executed under l2cap_sock_resume_cb(), we can avoid the issue simply by checking if chan->data is NULL. Let's not access to the killed socket in l2cap_sock_resume_cb(). [0]: BUG: KASAN: null-ptr-deref in instrument_atomic_write include/linux/instrumented.h:82 [inline] BUG: KASAN: null-ptr-deref in clear_bit include/asm-generic/bitops/instrumented-atomic.h:41 [inline] BUG: KASAN: null-ptr-deref in l2cap_sock_resume_cb+0xb4/0x17c net/bluetooth/l2cap_sock.c:1711 Write of size 8 at addr 0000000000000570 by task kworker/u9:0/52 CPU: 1 UID: 0 PID: 52 Comm: kworker/u9:0 Not tainted 6.16.0-rc4-syzkaller-g7482bb149b9f #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Workqueue: hci0 hci_rx_work Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:501 (C) __dump_stack+0x30/0x40 lib/dump_stack.c:94 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120 print_report+0x58/0x84 mm/kasan/report.c:524 kasan_report+0xb0/0x110 mm/kasan/report.c:634 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x264/0x2a4 mm/kasan/generic.c:189 __kasan_check_write+0x20/0x30 mm/kasan/shadow.c:37 instrument_atomic_write include/linux/instrumented.h:82 [inline] clear_bit include/asm-generic/bitops/instrumented-atomic.h:41 [inline] l2cap_sock_resume_cb+0xb4/0x17c net/bluetooth/l2cap_sock.c:1711 l2cap_security_cfm+0x524/0xea0 net/bluetooth/l2cap_core.c:7357 hci_auth_cfm include/net/bluetooth/hci_core.h:2092 [inline] hci_auth_complete_evt+0x2e8/0xa4c net/bluetooth/hci_event.c:3514 hci_event_func net/bluetooth/hci_event.c:7511 [inline] hci_event_packet+0x650/0xe9c net/bluetooth/hci_event.c:7565 hci_rx_work+0x320/0xb18 net/bluetooth/hci_core.c:4070 process_one_work+0x7e8/0x155c kernel/workqueue.c:3238 process_scheduled_works kernel/workqueue.c:3321 [inline] worker_thread+0x958/0xed8 kernel/workqueue.c:3402 kthread+0x5fc/0x75c kernel/kthread.c:464 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:847
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: d97c899bde330cd1c76c3a162558177563a74362 , < 262cd18f5f7ede6a586580cadc5d0799e52e2e7c (git)
Affected: d97c899bde330cd1c76c3a162558177563a74362 , < 2b27b389006623673e8cfff4ce1e119cce640b05 (git)
Affected: d97c899bde330cd1c76c3a162558177563a74362 , < 3a4eca2a1859955c65f07a570156bd2d9048ce33 (git)
Affected: d97c899bde330cd1c76c3a162558177563a74362 , < ac3a8147bb24314fb3e84986590148e79f9872ec (git)
Affected: d97c899bde330cd1c76c3a162558177563a74362 , < c4f16f6b071a74ac7eefe5c28985285cbbe2cd96 (git)
Affected: d97c899bde330cd1c76c3a162558177563a74362 , < b97be7ee8a1cd96b89817cbd64a9f5cc16c17d08 (git)
Affected: d97c899bde330cd1c76c3a162558177563a74362 , < 6d63901dcd592a1e3f71d7c6d78f9be5e8d7eef0 (git)
Affected: d97c899bde330cd1c76c3a162558177563a74362 , < a0075accbf0d76c2dad1ad3993d2e944505d99a0 (git)
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    Linux Linux Affected: 3.13
Unaffected: 0 , < 3.13 (semver)
Unaffected: 5.4.297 , ≤ 5.4.* (semver)
Unaffected: 5.10.241 , ≤ 5.10.* (semver)
Unaffected: 5.15.190 , ≤ 5.15.* (semver)
Unaffected: 6.1.147 , ≤ 6.1.* (semver)
Unaffected: 6.6.100 , ≤ 6.6.* (semver)
Unaffected: 6.12.40 , ≤ 6.12.* (semver)
Unaffected: 6.15.8 , ≤ 6.15.* (semver)
Unaffected: 6.16 , ≤ * (original_commit_for_fix)
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: Fix null-ptr-deref in l2cap_sock_resume_cb()\n\nsyzbot reported null-ptr-deref in l2cap_sock_resume_cb(). [0]\n\nl2cap_sock_resume_cb() has a similar problem that was fixed by commit\n1bff51ea59a9 (\"Bluetooth: fix use-after-free error in lock_sock_nested()\").\n\nSince both l2cap_sock_kill() and l2cap_sock_resume_cb() are executed\nunder l2cap_sock_resume_cb(), we can avoid the issue simply by checking\nif chan-\u003edata is NULL.\n\nLet\u0027s not access to the killed socket in l2cap_sock_resume_cb().\n\n[0]:\nBUG: KASAN: null-ptr-deref in instrument_atomic_write include/linux/instrumented.h:82 [inline]\nBUG: KASAN: null-ptr-deref in clear_bit include/asm-generic/bitops/instrumented-atomic.h:41 [inline]\nBUG: KASAN: null-ptr-deref in l2cap_sock_resume_cb+0xb4/0x17c net/bluetooth/l2cap_sock.c:1711\nWrite of size 8 at addr 0000000000000570 by task kworker/u9:0/52\n\nCPU: 1 UID: 0 PID: 52 Comm: kworker/u9:0 Not tainted 6.16.0-rc4-syzkaller-g7482bb149b9f #0 PREEMPT\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025\nWorkqueue: hci0 hci_rx_work\nCall trace:\n show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:501 (C)\n __dump_stack+0x30/0x40 lib/dump_stack.c:94\n dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120\n print_report+0x58/0x84 mm/kasan/report.c:524\n kasan_report+0xb0/0x110 mm/kasan/report.c:634\n check_region_inline mm/kasan/generic.c:-1 [inline]\n kasan_check_range+0x264/0x2a4 mm/kasan/generic.c:189\n __kasan_check_write+0x20/0x30 mm/kasan/shadow.c:37\n instrument_atomic_write include/linux/instrumented.h:82 [inline]\n clear_bit include/asm-generic/bitops/instrumented-atomic.h:41 [inline]\n l2cap_sock_resume_cb+0xb4/0x17c net/bluetooth/l2cap_sock.c:1711\n l2cap_security_cfm+0x524/0xea0 net/bluetooth/l2cap_core.c:7357\n hci_auth_cfm include/net/bluetooth/hci_core.h:2092 [inline]\n hci_auth_complete_evt+0x2e8/0xa4c net/bluetooth/hci_event.c:3514\n hci_event_func net/bluetooth/hci_event.c:7511 [inline]\n hci_event_packet+0x650/0xe9c net/bluetooth/hci_event.c:7565\n hci_rx_work+0x320/0xb18 net/bluetooth/hci_core.c:4070\n process_one_work+0x7e8/0x155c kernel/workqueue.c:3238\n process_scheduled_works kernel/workqueue.c:3321 [inline]\n worker_thread+0x958/0xed8 kernel/workqueue.c:3402\n kthread+0x5fc/0x75c kernel/kthread.c:464\n ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:847"
        }
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      "providerMetadata": {
        "dateUpdated": "2025-08-28T14:43:10.331Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/262cd18f5f7ede6a586580cadc5d0799e52e2e7c"
        },
        {
          "url": "https://git.kernel.org/stable/c/2b27b389006623673e8cfff4ce1e119cce640b05"
        },
        {
          "url": "https://git.kernel.org/stable/c/3a4eca2a1859955c65f07a570156bd2d9048ce33"
        },
        {
          "url": "https://git.kernel.org/stable/c/ac3a8147bb24314fb3e84986590148e79f9872ec"
        },
        {
          "url": "https://git.kernel.org/stable/c/c4f16f6b071a74ac7eefe5c28985285cbbe2cd96"
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        {
          "url": "https://git.kernel.org/stable/c/b97be7ee8a1cd96b89817cbd64a9f5cc16c17d08"
        },
        {
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        {
          "url": "https://git.kernel.org/stable/c/a0075accbf0d76c2dad1ad3993d2e944505d99a0"
        }
      ],
      "title": "Bluetooth: Fix null-ptr-deref in l2cap_sock_resume_cb()",
      "x_generator": {
        "engine": "bippy-1.2.0"
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38473",
    "datePublished": "2025-07-28T11:21:34.880Z",
    "dateReserved": "2025-04-16T04:51:24.021Z",
    "dateUpdated": "2025-11-03T17:38:39.105Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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  • 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.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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