Vulnerability-Lookup

FKIE_CVE-2026-23461

Vulnerability from fkie_nvd - Published: 2026-04-03 16:16 - Updated: 2026-07-24 22:10

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: L2CAP: Fix use-after-free in l2cap_unregister_user After commit ab4eedb790ca ("Bluetooth: L2CAP: Fix corrupted list in hci_chan_del"), l2cap_conn_del() uses conn->lock to protect access to conn->users. However, l2cap_register_user() and l2cap_unregister_user() don't use conn->lock, creating a race condition where these functions can access conn->users and conn->hchan concurrently with l2cap_conn_del(). This can lead to use-after-free and list corruption bugs, as reported by syzbot. Fix this by changing l2cap_register_user() and l2cap_unregister_user() to use conn->lock instead of hci_dev_lock(), ensuring consistent locking for the l2cap_conn structure.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/11a87dd5df428a4b79a84d2790cac7f3c73f1f0d	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/71030f3b3015a412133a805ff47970cdcf30c2b8	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/752a6c9596dd25efd6978a73ff21f3b592668f4a	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/c22a5e659959eb77c2fbb58a5adfaf3c3dab7abf	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/da3000cbe4851458a22be38bb18c0689c39fdd5f	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	6.14
linux	linux_kernel	6.14
linux	linux_kernel	6.14
linux	linux_kernel	6.14
linux	linux_kernel	6.14
linux	linux_kernel	6.14
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0

JSON

To clipboard

{
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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 in l2cap_unregister_user\n\nAfter commit ab4eedb790ca (\"Bluetooth: L2CAP: Fix corrupted list in\nhci_chan_del\"), l2cap_conn_del() uses conn-\u003elock to protect access to\nconn-\u003eusers. However, l2cap_register_user() and l2cap_unregister_user()\ndon\u0027t use conn-\u003elock, creating a race condition where these functions can\naccess conn-\u003eusers and conn-\u003ehchan concurrently with l2cap_conn_del().\n\nThis can lead to use-after-free and list corruption bugs, as reported\nby syzbot.\n\nFix this by changing l2cap_register_user() and l2cap_unregister_user()\nto use conn-\u003elock instead of hci_dev_lock(), ensuring consistent locking\nfor the l2cap_conn structure."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nBluetooth: L2CAP: Correcci\u00f3n de uso despu\u00e9s de liberaci\u00f3n en l2cap_unregister_user\n\nDespu\u00e9s del commit ab4eedb790ca (\u0027Bluetooth: L2CAP: Correcci\u00f3n de lista corrupta en hci_chan_del\u0027), l2cap_conn_del() utiliza conn -\u003e lock para proteger el acceso a conn -\u003e users. Sin embargo, l2cap_register_user() y l2cap_unregister_user() no utilizan conn -\u003e lock, creando una condici\u00f3n de carrera donde estas funciones pueden acceder a conn -\u003e users y conn -\u003e hchan concurrentemente con l2cap_conn_del().\n\nEsto puede llevar a uso despu\u00e9s de liberaci\u00f3n y errores de corrupci\u00f3n de lista, seg\u00fan lo informado por syzbot.\n\nEsto se corrige cambiando l2cap_register_user() y l2cap_unregister_user() para que utilicen conn -\u003e lock en lugar de hci_dev_lock(), asegurando un bloqueo consistente para la estructura l2cap_conn."
    }
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  "id": "CVE-2026-23461",
  "lastModified": "2026-07-24T22:10:00.140",
  "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"
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        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
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  "published": "2026-04-03T16:16:33.140",
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  "vulnStatus": "Analyzed",
  "weaknesses": [
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      "description": [
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          "lang": "en",
          "value": "CWE-416"
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      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

CVE-2026-23461 (GCVE-0-2026-23461)

Vulnerability from cvelistv5 – Published: 2026-04-03 15:15 – Updated: 2026-08-05 12:21

Title

Bluetooth: L2CAP: Fix use-after-free in l2cap_unregister_user

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/11a87dd5df428a4b7…
https://git.kernel.org/stable/c/c22a5e659959eb77c…
https://git.kernel.org/stable/c/da3000cbe4851458a…
https://git.kernel.org/stable/c/71030f3b3015a4121…
https://git.kernel.org/stable/c/752a6c9596dd25efd…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: efc30877bd4bc85fefe98d80af60fafc86e5775e , < 11a87dd5df428a4b79a84d2790cac7f3c73f1f0d (git) Affected: f87271d21dd4ee83857ca11b94e7b4952749bbae , < c22a5e659959eb77c2fbb58a5adfaf3c3dab7abf (git) Affected: ab4eedb790cae44313759b50fe47da285e2519d5 , < da3000cbe4851458a22be38bb18c0689c39fdd5f (git) Affected: ab4eedb790cae44313759b50fe47da285e2519d5 , < 71030f3b3015a412133a805ff47970cdcf30c2b8 (git) Affected: ab4eedb790cae44313759b50fe47da285e2519d5 , < 752a6c9596dd25efd6978a73ff21f3b592668f4a (git) Affected: 18ab6b6078fa8191ca30a3065d57bf35d5635761 (git) Affected: 6.6.84 , < 6.6.130 (semver) Affected: 6.12.20 , < 6.12.78 (semver) Affected: 6.13.8 , < 6.14 (semver)
Linux	Linux	Affected: 6.14 Unaffected: 0 , < 6.14 (semver) Unaffected: 6.6.130 , ≤ 6.6.* (semver) Unaffected: 6.12.78 , ≤ 6.12.* (semver) Unaffected: 6.18.20 , ≤ 6.18.* (semver) Unaffected: 6.19.10 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/l2cap_core.c"
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: Fix use-after-free in l2cap_unregister_user\n\nAfter commit ab4eedb790ca (\"Bluetooth: L2CAP: Fix corrupted list in\nhci_chan_del\"), l2cap_conn_del() uses conn-\u003elock to protect access to\nconn-\u003eusers. However, l2cap_register_user() and l2cap_unregister_user()\ndon\u0027t use conn-\u003elock, creating a race condition where these functions can\naccess conn-\u003eusers and conn-\u003ehchan concurrently with l2cap_conn_del().\n\nThis can lead to use-after-free and list corruption bugs, as reported\nby syzbot.\n\nFix this by changing l2cap_register_user() and l2cap_unregister_user()\nto use conn-\u003elock instead of hci_dev_lock(), ensuring consistent locking\nfor the l2cap_conn structure."
        }
      ],
      "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 vulnerable L2CAP/HIDP teardown path is reachable through Bluetooth ACL/L2CAP connection handling by a nearby Bluetooth peer. Bluetooth proximity is an adjacent-network attack surface rather than internet-routable network access.\nAC:L - This is a locking/race use-after-free where the attacker can repeatedly drive HIDP/L2CAP connection teardown and unregister paths through connection close/disconnect behavior. The race is not dependent on a rare configuration or a condition outside attacker influence.\nPR:N - Although the local HIDP management ioctl path is gated by init-namespace CAP_NET_ADMIN, an adjacent malicious Bluetooth HID peer can trigger teardown of an already established HIDP/L2CAP session without privileges on the victim system. Under the higher-severity reasonable Bluetooth-peer scenario, no victim-system privileges are required.\nUI:N - Once the HIDP/L2CAP session exists, triggering the vulnerable unregister/connection-delete race does not require a victim user to perform an action. The peer can cause disconnect/teardown behavior directly.\nS:U - The vulnerability corrupts kernel Bluetooth/L2CAP state within the same kernel security authority. It is not a VM escape, IOMMU bypass, or other scope-changing boundary crossing.\nC:H - The flaw is a kernel use-after-free/list corruption condition involving L2CAP connection/user objects and potentially freed HCI device memory. Kernel UAFs are defensibly treated as enabling high confidentiality impact through memory disclosure primitives.\nI:H - The same UAF/list corruption can be leveraged beyond a crash for heap manipulation and control-flow or data-structure corruption. Kernel memory corruption is therefore high integrity impact.\nA:H - Syzbot reports show KASAN use-after-free crashes in l2cap_unregister_user, and the bug can corrupt lists during connection teardown. A kernel crash/oops is high availability impact."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:21:59.477Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/11a87dd5df428a4b79a84d2790cac7f3c73f1f0d"
        },
        {
          "url": "https://git.kernel.org/stable/c/c22a5e659959eb77c2fbb58a5adfaf3c3dab7abf"
        },
        {
          "url": "https://git.kernel.org/stable/c/da3000cbe4851458a22be38bb18c0689c39fdd5f"
        },
        {
          "url": "https://git.kernel.org/stable/c/71030f3b3015a412133a805ff47970cdcf30c2b8"
        },
        {
          "url": "https://git.kernel.org/stable/c/752a6c9596dd25efd6978a73ff21f3b592668f4a"
        }
      ],
      "title": "Bluetooth: L2CAP: Fix use-after-free in l2cap_unregister_user",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-23461",
    "datePublished": "2026-04-03T15:15:41.051Z",
    "dateReserved": "2026-01-13T15:37:46.021Z",
    "dateUpdated": "2026-08-05T12:21:59.477Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

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Nomenclature

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Detection rules are retrieved from Rulezet.

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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.
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FKIE_CVE-2026-23461

CVE-2026-23461 (GCVE-0-2026-23461)

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