Vulnerability-Lookup

FKIE_CVE-2022-49910

Vulnerability from fkie_nvd - Published: 2025-05-01 15:16 - Updated: 2026-08-04 10:17

Severity

8.8 (High) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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: L2CAP: Fix use-after-free caused by l2cap_reassemble_sdu Fix the race condition between the following two flows that run in parallel: 1. l2cap_reassemble_sdu -> chan->ops->recv (l2cap_sock_recv_cb) -> __sock_queue_rcv_skb. 2. bt_sock_recvmsg -> skb_recv_datagram, skb_free_datagram. An SKB can be queued by the first flow and immediately dequeued and freed by the second flow, therefore the callers of l2cap_reassemble_sdu can't use the SKB after that function returns. However, some places continue accessing struct l2cap_ctrl that resides in the SKB's CB for a short time after l2cap_reassemble_sdu returns, leading to a use-after-free condition (the stack trace is below, line numbers for kernel 5.19.8). Fix it by keeping a local copy of struct l2cap_ctrl. BUG: KASAN: use-after-free in l2cap_rx_state_recv (net/bluetooth/l2cap_core.c:6906) bluetooth Read of size 1 at addr ffff88812025f2f0 by task kworker/u17:3/43169 Workqueue: hci0 hci_rx_work [bluetooth] Call Trace: <TASK> dump_stack_lvl (lib/dump_stack.c:107 (discriminator 4)) print_report.cold (mm/kasan/report.c:314 mm/kasan/report.c:429) ? l2cap_rx_state_recv (net/bluetooth/l2cap_core.c:6906) bluetooth kasan_report (mm/kasan/report.c:162 mm/kasan/report.c:493) ? l2cap_rx_state_recv (net/bluetooth/l2cap_core.c:6906) bluetooth l2cap_rx_state_recv (net/bluetooth/l2cap_core.c:6906) bluetooth l2cap_rx (net/bluetooth/l2cap_core.c:7236 net/bluetooth/l2cap_core.c:7271) bluetooth ret_from_fork (arch/x86/entry/entry_64.S:306) </TASK> Allocated by task 43169: kasan_save_stack (mm/kasan/common.c:39) __kasan_slab_alloc (mm/kasan/common.c:45 mm/kasan/common.c:436 mm/kasan/common.c:469) kmem_cache_alloc_node (mm/slab.h:750 mm/slub.c:3243 mm/slub.c:3293) __alloc_skb (net/core/skbuff.c:414) l2cap_recv_frag (./include/net/bluetooth/bluetooth.h:425 net/bluetooth/l2cap_core.c:8329) bluetooth l2cap_recv_acldata (net/bluetooth/l2cap_core.c:8442) bluetooth hci_rx_work (net/bluetooth/hci_core.c:3642 net/bluetooth/hci_core.c:3832) bluetooth process_one_work (kernel/workqueue.c:2289) worker_thread (./include/linux/list.h:292 kernel/workqueue.c:2437) kthread (kernel/kthread.c:376) ret_from_fork (arch/x86/entry/entry_64.S:306) Freed by task 27920: kasan_save_stack (mm/kasan/common.c:39) kasan_set_track (mm/kasan/common.c:45) kasan_set_free_info (mm/kasan/generic.c:372) ____kasan_slab_free (mm/kasan/common.c:368 mm/kasan/common.c:328) slab_free_freelist_hook (mm/slub.c:1780) kmem_cache_free (mm/slub.c:3536 mm/slub.c:3553) skb_free_datagram (./include/net/sock.h:1578 ./include/net/sock.h:1639 net/core/datagram.c:323) bt_sock_recvmsg (net/bluetooth/af_bluetooth.c:295) bluetooth l2cap_sock_recvmsg (net/bluetooth/l2cap_sock.c:1212) bluetooth sock_read_iter (net/socket.c:1087) new_sync_read (./include/linux/fs.h:2052 fs/read_write.c:401) vfs_read (fs/read_write.c:482) ksys_read (fs/read_write.c:620) do_syscall_64 (arch/x86/entry/common.c:50 arch/x86/entry/common.c:80) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:120)

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/03af22e23b96fb7ef75fb7885407ef457e8b403d	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/3aff8aaca4e36dc8b17eaa011684881a80238966	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/4cd094fd5d872862ca278e15b9b51b07e915ef3f	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/6c7407bfbeafc80a04e6eaedcf34d378532a04f2	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/8278a87bb1eeea94350d675ef961ee5a03341fde	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/9a04161244603f502c6e453913e51edd59cb70c1	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/cb1c012099ef5904cd468bdb8d6fcdfdd9bcb569	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/dc30e05bb18852303084430c03ca76e69257d9ea	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	6.1
linux	linux_kernel	6.1
linux	linux_kernel	6.1

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/l2cap_core.c"
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              "version": "0",
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              "status": "unaffected",
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            },
            {
              "lessThanOrEqual": "4.19.*",
              "status": "unaffected",
              "version": "4.19.265",
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              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.224",
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            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.154",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.78",
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            {
              "lessThanOrEqual": "6.0.*",
              "status": "unaffected",
              "version": "6.0.8",
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            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: Fix use-after-free caused by l2cap_reassemble_sdu\n\nFix the race condition between the following two flows that run in\nparallel:\n\n1. l2cap_reassemble_sdu -\u003e chan-\u003eops-\u003erecv (l2cap_sock_recv_cb) -\u003e\n   __sock_queue_rcv_skb.\n\n2. bt_sock_recvmsg -\u003e skb_recv_datagram, skb_free_datagram.\n\nAn SKB can be queued by the first flow and immediately dequeued and\nfreed by the second flow, therefore the callers of l2cap_reassemble_sdu\ncan\u0027t use the SKB after that function returns. However, some places\ncontinue accessing struct l2cap_ctrl that resides in the SKB\u0027s CB for a\nshort time after l2cap_reassemble_sdu returns, leading to a\nuse-after-free condition (the stack trace is below, line numbers for\nkernel 5.19.8).\n\nFix it by keeping a local copy of struct l2cap_ctrl.\n\nBUG: KASAN: use-after-free in l2cap_rx_state_recv (net/bluetooth/l2cap_core.c:6906) bluetooth\nRead of size 1 at addr ffff88812025f2f0 by task kworker/u17:3/43169\n\nWorkqueue: hci0 hci_rx_work [bluetooth]\nCall Trace:\n \u003cTASK\u003e\n dump_stack_lvl (lib/dump_stack.c:107 (discriminator 4))\n print_report.cold (mm/kasan/report.c:314 mm/kasan/report.c:429)\n ? l2cap_rx_state_recv (net/bluetooth/l2cap_core.c:6906) bluetooth\n kasan_report (mm/kasan/report.c:162 mm/kasan/report.c:493)\n ? l2cap_rx_state_recv (net/bluetooth/l2cap_core.c:6906) bluetooth\n l2cap_rx_state_recv (net/bluetooth/l2cap_core.c:6906) bluetooth\n l2cap_rx (net/bluetooth/l2cap_core.c:7236 net/bluetooth/l2cap_core.c:7271) bluetooth\n ret_from_fork (arch/x86/entry/entry_64.S:306)\n \u003c/TASK\u003e\n\nAllocated by task 43169:\n kasan_save_stack (mm/kasan/common.c:39)\n __kasan_slab_alloc (mm/kasan/common.c:45 mm/kasan/common.c:436 mm/kasan/common.c:469)\n kmem_cache_alloc_node (mm/slab.h:750 mm/slub.c:3243 mm/slub.c:3293)\n __alloc_skb (net/core/skbuff.c:414)\n l2cap_recv_frag (./include/net/bluetooth/bluetooth.h:425 net/bluetooth/l2cap_core.c:8329) bluetooth\n l2cap_recv_acldata (net/bluetooth/l2cap_core.c:8442) bluetooth\n hci_rx_work (net/bluetooth/hci_core.c:3642 net/bluetooth/hci_core.c:3832) bluetooth\n process_one_work (kernel/workqueue.c:2289)\n worker_thread (./include/linux/list.h:292 kernel/workqueue.c:2437)\n kthread (kernel/kthread.c:376)\n ret_from_fork (arch/x86/entry/entry_64.S:306)\n\nFreed by task 27920:\n kasan_save_stack (mm/kasan/common.c:39)\n kasan_set_track (mm/kasan/common.c:45)\n kasan_set_free_info (mm/kasan/generic.c:372)\n ____kasan_slab_free (mm/kasan/common.c:368 mm/kasan/common.c:328)\n slab_free_freelist_hook (mm/slub.c:1780)\n kmem_cache_free (mm/slub.c:3536 mm/slub.c:3553)\n skb_free_datagram (./include/net/sock.h:1578 ./include/net/sock.h:1639 net/core/datagram.c:323)\n bt_sock_recvmsg (net/bluetooth/af_bluetooth.c:295) bluetooth\n l2cap_sock_recvmsg (net/bluetooth/l2cap_sock.c:1212) bluetooth\n sock_read_iter (net/socket.c:1087)\n new_sync_read (./include/linux/fs.h:2052 fs/read_write.c:401)\n vfs_read (fs/read_write.c:482)\n ksys_read (fs/read_write.c:620)\n do_syscall_64 (arch/x86/entry/common.c:50 arch/x86/entry/common.c:80)\n entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:120)"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: Bluetooth: L2CAP: Se corrige eluse-after-free causado por l2cap_reassemble_sdu. Se corrige la condici\u00f3n de ejecuci\u00f3n entre los dos flujos que se ejecutan en paralelo: 1. l2cap_reassemble_sdu -\u0026gt; chan-\u0026gt;ops-\u0026gt;recv (l2cap_sock_recv_cb) -\u0026gt; __sock_queue_rcv_skb. 2. bt_sock_recvmsg -\u0026gt; skb_recv_datagram, skb_free_datagram. Un SKB puede ser puesto en cola por el primer flujo e inmediatamente desencolado y liberado por el segundo flujo; por lo tanto, quienes llaman a l2cap_reassemble_sdu no pueden usar el SKB despu\u00e9s del retorno de la funci\u00f3n. Sin embargo, en algunos lugares, se contin\u00faa accediendo a la estructura l2cap_ctrl, que reside en el CB de la SKB, durante un breve periodo despu\u00e9s del retorno de l2cap_reassemble_sdu, lo que genera una condici\u00f3n de use-after-free (el seguimiento de la pila se encuentra a continuaci\u00f3n; los n\u00fameros de l\u00ednea corresponden al kernel 5.19.8). Para solucionarlo, mantenga una copia local de la estructura l2cap_ctrl. ERROR: KASAN: use-after-free en l2cap_rx_state_recv (net/bluetooth/l2cap_core.c:6906) bluetooth Lectura de tama\u00f1o 1 en la direcci\u00f3n ffff88812025f2f0 por la tarea kworker/u17:3/43169 Cola de trabajo: hci0 hci_rx_work [bluetooth] Rastreo de llamadas:   dump_stack_lvl (lib/dump_stack.c:107 (discriminator 4)) print_report.cold (mm/kasan/report.c:314 mm/kasan/report.c:429) ? l2cap_rx_state_recv (net/bluetooth/l2cap_core.c:6906) bluetooth kasan_report (mm/kasan/report.c:162 mm/kasan/report.c:493) ? l2cap_rx_state_recv (net/bluetooth/l2cap_core.c:6906) bluetooth l2cap_rx_state_recv (net/bluetooth/l2cap_core.c:6906) bluetooth l2cap_rx (net/bluetooth/l2cap_core.c:7236 net/bluetooth/l2cap_core.c:7271) bluetooth ret_from_fork (arch/x86/entry/entry_64.S:306)  Allocated by task 43169: kasan_save_stack (mm/kasan/common.c:39) __kasan_slab_alloc (mm/kasan/common.c:45 mm/kasan/common.c:436 mm/kasan/common.c:469) kmem_cache_alloc_node (mm/slab.h:750 mm/slub.c:3243 mm/slub.c:3293) __alloc_skb (net/core/skbuff.c:414) l2cap_recv_frag (./include/net/bluetooth/bluetooth.h:425 net/bluetooth/l2cap_core.c:8329) bluetooth l2cap_recv_acldata (net/bluetooth/l2cap_core.c:8442) bluetooth hci_rx_work (net/bluetooth/hci_core.c:3642 net/bluetooth/hci_core.c:3832) bluetooth process_one_work (kernel/workqueue.c:2289) worker_thread (./include/linux/list.h:292 kernel/workqueue.c:2437) kthread (kernel/kthread.c:376) ret_from_fork (arch/x86/entry/entry_64.S:306) Freed by task 27920: kasan_save_stack (mm/kasan/common.c:39) kasan_set_track (mm/kasan/common.c:45) kasan_set_free_info (mm/kasan/generic.c:372) ____kasan_slab_free (mm/kasan/common.c:368 mm/kasan/common.c:328) slab_free_freelist_hook (mm/slub.c:1780) kmem_cache_free (mm/slub.c:3536 mm/slub.c:3553) skb_free_datagram (./include/net/sock.h:1578 ./include/net/sock.h:1639 net/core/datagram.c:323) bt_sock_recvmsg (net/bluetooth/af_bluetooth.c:295) bluetooth l2cap_sock_recvmsg (net/bluetooth/l2cap_sock.c:1212) bluetooth sock_read_iter (net/socket.c:1087) new_sync_read (./include/linux/fs.h:2052 fs/read_write.c:401) vfs_read (fs/read_write.c:482) ksys_read (fs/read_write.c:620) do_syscall_64 (arch/x86/entry/common.c:50 arch/x86/entry/common.c:80) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:120) "
    }
  ],
  "id": "CVE-2022-49910",
  "lastModified": "2026-08-04T10:17:58.980",
  "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"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2025-05-01T15:16:16.147",
  "references": [
    {
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      "tags": [
        "Patch"
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
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      "url": "https://git.kernel.org/stable/c/3aff8aaca4e36dc8b17eaa011684881a80238966"
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
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      "url": "https://git.kernel.org/stable/c/6c7407bfbeafc80a04e6eaedcf34d378532a04f2"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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    },
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      "tags": [
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      "url": "https://git.kernel.org/stable/c/dc30e05bb18852303084430c03ca76e69257d9ea"
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-416"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

CVE-2022-49910 (GCVE-0-2022-49910)

Vulnerability from cvelistv5 – Published: 2025-05-01 14:10 – Updated: 2026-08-05 08:56

Title

Bluetooth: L2CAP: Fix use-after-free caused by l2cap_reassemble_sdu

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 CNA under the mitre root

CNA scorecard D 53/100 over 7067 records in the last 180 days details

References

8 references

URL	Tags
https://git.kernel.org/stable/c/dc30e05bb18852303…
https://git.kernel.org/stable/c/03af22e23b96fb7ef…
https://git.kernel.org/stable/c/6c7407bfbeafc80a0…
https://git.kernel.org/stable/c/4cd094fd5d872862c…
https://git.kernel.org/stable/c/cb1c012099ef5904c…
https://git.kernel.org/stable/c/8278a87bb1eeea943…
https://git.kernel.org/stable/c/9a04161244603f502…
https://git.kernel.org/stable/c/3aff8aaca4e36dc8b…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 4b51dae96731c9d82f5634e75ac7ffd3b9c1b060 , < dc30e05bb18852303084430c03ca76e69257d9ea (git) Affected: 4b51dae96731c9d82f5634e75ac7ffd3b9c1b060 , < 03af22e23b96fb7ef75fb7885407ef457e8b403d (git) Affected: 4b51dae96731c9d82f5634e75ac7ffd3b9c1b060 , < 6c7407bfbeafc80a04e6eaedcf34d378532a04f2 (git) Affected: 4b51dae96731c9d82f5634e75ac7ffd3b9c1b060 , < 4cd094fd5d872862ca278e15b9b51b07e915ef3f (git) Affected: 4b51dae96731c9d82f5634e75ac7ffd3b9c1b060 , < cb1c012099ef5904cd468bdb8d6fcdfdd9bcb569 (git) Affected: 4b51dae96731c9d82f5634e75ac7ffd3b9c1b060 , < 8278a87bb1eeea94350d675ef961ee5a03341fde (git) Affected: 4b51dae96731c9d82f5634e75ac7ffd3b9c1b060 , < 9a04161244603f502c6e453913e51edd59cb70c1 (git) Affected: 4b51dae96731c9d82f5634e75ac7ffd3b9c1b060 , < 3aff8aaca4e36dc8b17eaa011684881a80238966 (git)
Linux	Linux	Affected: 3.6 Unaffected: 0 , < 3.6 (semver) Unaffected: 4.9.333 , ≤ 4.9.* (semver) Unaffected: 4.14.299 , ≤ 4.14.* (semver) Unaffected: 4.19.265 , ≤ 4.19.* (semver) Unaffected: 5.4.224 , ≤ 5.4.* (semver) Unaffected: 5.10.154 , ≤ 5.10.* (semver) Unaffected: 5.15.78 , ≤ 5.15.* (semver) Unaffected: 6.0.8 , ≤ 6.0.* (semver) Unaffected: 6.1 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/l2cap_core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "dc30e05bb18852303084430c03ca76e69257d9ea",
              "status": "affected",
              "version": "4b51dae96731c9d82f5634e75ac7ffd3b9c1b060",
              "versionType": "git"
            },
            {
              "lessThan": "03af22e23b96fb7ef75fb7885407ef457e8b403d",
              "status": "affected",
              "version": "4b51dae96731c9d82f5634e75ac7ffd3b9c1b060",
              "versionType": "git"
            },
            {
              "lessThan": "6c7407bfbeafc80a04e6eaedcf34d378532a04f2",
              "status": "affected",
              "version": "4b51dae96731c9d82f5634e75ac7ffd3b9c1b060",
              "versionType": "git"
            },
            {
              "lessThan": "4cd094fd5d872862ca278e15b9b51b07e915ef3f",
              "status": "affected",
              "version": "4b51dae96731c9d82f5634e75ac7ffd3b9c1b060",
              "versionType": "git"
            },
            {
              "lessThan": "cb1c012099ef5904cd468bdb8d6fcdfdd9bcb569",
              "status": "affected",
              "version": "4b51dae96731c9d82f5634e75ac7ffd3b9c1b060",
              "versionType": "git"
            },
            {
              "lessThan": "8278a87bb1eeea94350d675ef961ee5a03341fde",
              "status": "affected",
              "version": "4b51dae96731c9d82f5634e75ac7ffd3b9c1b060",
              "versionType": "git"
            },
            {
              "lessThan": "9a04161244603f502c6e453913e51edd59cb70c1",
              "status": "affected",
              "version": "4b51dae96731c9d82f5634e75ac7ffd3b9c1b060",
              "versionType": "git"
            },
            {
              "lessThan": "3aff8aaca4e36dc8b17eaa011684881a80238966",
              "status": "affected",
              "version": "4b51dae96731c9d82f5634e75ac7ffd3b9c1b060",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/l2cap_core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.6"
            },
            {
              "lessThan": "3.6",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.9.*",
              "status": "unaffected",
              "version": "4.9.333",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.14.*",
              "status": "unaffected",
              "version": "4.14.299",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.19.*",
              "status": "unaffected",
              "version": "4.19.265",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.224",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.154",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.78",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.0.*",
              "status": "unaffected",
              "version": "6.0.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.9.333",
                  "versionStartIncluding": "3.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.14.299",
                  "versionStartIncluding": "3.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.19.265",
                  "versionStartIncluding": "3.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.4.224",
                  "versionStartIncluding": "3.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.154",
                  "versionStartIncluding": "3.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.78",
                  "versionStartIncluding": "3.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.0.8",
                  "versionStartIncluding": "3.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1",
                  "versionStartIncluding": "3.6",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: Fix use-after-free caused by l2cap_reassemble_sdu\n\nFix the race condition between the following two flows that run in\nparallel:\n\n1. l2cap_reassemble_sdu -\u003e chan-\u003eops-\u003erecv (l2cap_sock_recv_cb) -\u003e\n   __sock_queue_rcv_skb.\n\n2. bt_sock_recvmsg -\u003e skb_recv_datagram, skb_free_datagram.\n\nAn SKB can be queued by the first flow and immediately dequeued and\nfreed by the second flow, therefore the callers of l2cap_reassemble_sdu\ncan\u0027t use the SKB after that function returns. However, some places\ncontinue accessing struct l2cap_ctrl that resides in the SKB\u0027s CB for a\nshort time after l2cap_reassemble_sdu returns, leading to a\nuse-after-free condition (the stack trace is below, line numbers for\nkernel 5.19.8).\n\nFix it by keeping a local copy of struct l2cap_ctrl.\n\nBUG: KASAN: use-after-free in l2cap_rx_state_recv (net/bluetooth/l2cap_core.c:6906) bluetooth\nRead of size 1 at addr ffff88812025f2f0 by task kworker/u17:3/43169\n\nWorkqueue: hci0 hci_rx_work [bluetooth]\nCall Trace:\n \u003cTASK\u003e\n dump_stack_lvl (lib/dump_stack.c:107 (discriminator 4))\n print_report.cold (mm/kasan/report.c:314 mm/kasan/report.c:429)\n ? l2cap_rx_state_recv (net/bluetooth/l2cap_core.c:6906) bluetooth\n kasan_report (mm/kasan/report.c:162 mm/kasan/report.c:493)\n ? l2cap_rx_state_recv (net/bluetooth/l2cap_core.c:6906) bluetooth\n l2cap_rx_state_recv (net/bluetooth/l2cap_core.c:6906) bluetooth\n l2cap_rx (net/bluetooth/l2cap_core.c:7236 net/bluetooth/l2cap_core.c:7271) bluetooth\n ret_from_fork (arch/x86/entry/entry_64.S:306)\n \u003c/TASK\u003e\n\nAllocated by task 43169:\n kasan_save_stack (mm/kasan/common.c:39)\n __kasan_slab_alloc (mm/kasan/common.c:45 mm/kasan/common.c:436 mm/kasan/common.c:469)\n kmem_cache_alloc_node (mm/slab.h:750 mm/slub.c:3243 mm/slub.c:3293)\n __alloc_skb (net/core/skbuff.c:414)\n l2cap_recv_frag (./include/net/bluetooth/bluetooth.h:425 net/bluetooth/l2cap_core.c:8329) bluetooth\n l2cap_recv_acldata (net/bluetooth/l2cap_core.c:8442) bluetooth\n hci_rx_work (net/bluetooth/hci_core.c:3642 net/bluetooth/hci_core.c:3832) bluetooth\n process_one_work (kernel/workqueue.c:2289)\n worker_thread (./include/linux/list.h:292 kernel/workqueue.c:2437)\n kthread (kernel/kthread.c:376)\n ret_from_fork (arch/x86/entry/entry_64.S:306)\n\nFreed by task 27920:\n kasan_save_stack (mm/kasan/common.c:39)\n kasan_set_track (mm/kasan/common.c:45)\n kasan_set_free_info (mm/kasan/generic.c:372)\n ____kasan_slab_free (mm/kasan/common.c:368 mm/kasan/common.c:328)\n slab_free_freelist_hook (mm/slub.c:1780)\n kmem_cache_free (mm/slub.c:3536 mm/slub.c:3553)\n skb_free_datagram (./include/net/sock.h:1578 ./include/net/sock.h:1639 net/core/datagram.c:323)\n bt_sock_recvmsg (net/bluetooth/af_bluetooth.c:295) bluetooth\n l2cap_sock_recvmsg (net/bluetooth/l2cap_sock.c:1212) bluetooth\n sock_read_iter (net/socket.c:1087)\n new_sync_read (./include/linux/fs.h:2052 fs/read_write.c:401)\n vfs_read (fs/read_write.c:482)\n ksys_read (fs/read_write.c:620)\n do_syscall_64 (arch/x86/entry/common.c:50 arch/x86/entry/common.c:80)\n entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:120)"
        }
      ],
      "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 bug is reached by processing Bluetooth ACL/L2CAP I-frames in hci_rx_work \u2192 l2cap_recv_acldata \u2192 l2cap_data_rcv \u2192 l2cap_rx_state_recv/l2cap_stream_rx, which requires an attacker on the same Bluetooth segment.\nAC:L - An adjacent peer can reliably drive the receive path by sending ERTM/streaming I-frames on an established channel; on SMP, a normal blocking socket reader frees the skb in the race window the attacker creates, and a local app plus attacker-controlled peer can control both sides.\nPR:N - Exploitation is via unauthenticated Bluetooth L2CAP data handling in the kernel RX path; the adjacent attacker needs no privileges on the victim host (consistent with other Bluetooth L2CAP UAF scores).\nUI:N - No additional user action is required beyond an active L2CAP ERTM/streaming channel (for example RFCOMM or an already-paired/auto-connecting peer whose socket is being read by userspace).\nS:U - This is in-kernel heap UAF within the Bluetooth stack and does not cross a separate security authority such as a VM or IOMMU boundary.\nC:H - Use-after-free of the skb (including cb-resident l2cap_ctrl) enables heap reuse and arbitrary kernel memory disclosure primitives.\nI:H - Post-free use of control feeds l2cap_retransmit_all and channel sequence updates, so the UAF can be turned into heap corruption and control-flow hijacking.\nA:H - The UAF is a demonstrated KASAN use-after-free on the HCI RX workqueue and can cause kernel oops/panic even without full exploitation."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T08:56:39.541Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/dc30e05bb18852303084430c03ca76e69257d9ea"
        },
        {
          "url": "https://git.kernel.org/stable/c/03af22e23b96fb7ef75fb7885407ef457e8b403d"
        },
        {
          "url": "https://git.kernel.org/stable/c/6c7407bfbeafc80a04e6eaedcf34d378532a04f2"
        },
        {
          "url": "https://git.kernel.org/stable/c/4cd094fd5d872862ca278e15b9b51b07e915ef3f"
        },
        {
          "url": "https://git.kernel.org/stable/c/cb1c012099ef5904cd468bdb8d6fcdfdd9bcb569"
        },
        {
          "url": "https://git.kernel.org/stable/c/8278a87bb1eeea94350d675ef961ee5a03341fde"
        },
        {
          "url": "https://git.kernel.org/stable/c/9a04161244603f502c6e453913e51edd59cb70c1"
        },
        {
          "url": "https://git.kernel.org/stable/c/3aff8aaca4e36dc8b17eaa011684881a80238966"
        }
      ],
      "title": "Bluetooth: L2CAP: Fix use-after-free caused by l2cap_reassemble_sdu",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49910",
    "datePublished": "2025-05-01T14:10:53.010Z",
    "dateReserved": "2025-05-01T14:05:17.247Z",
    "dateUpdated": "2026-08-05T08:56:39.541Z",
    "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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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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.

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