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

Vulnerability from cvelistv5 – Published: 2026-04-03 15:15 – Updated: 2026-08-05 12:21
VLAI
Title
Bluetooth: L2CAP: Fix use-after-free in l2cap_unregister_user
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.
Severity
8.8 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
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)
guessed Create a notification for this product.
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)
guessed Create a notification for this product.
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            "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."
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            "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",
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              "type": "Secondary"
            }
          ]
        },
        "published": "2026-04-03T16:16:33.140",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/11a87dd5df428a4b79a84d2790cac7f3c73f1f0d"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/71030f3b3015a412133a805ff47970cdcf30c2b8"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/752a6c9596dd25efd6978a73ff21f3b592668f4a"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/c22a5e659959eb77c2fbb58a5adfaf3c3dab7abf"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/da3000cbe4851458a22be38bb18c0689c39fdd5f"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-416"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-30T11:46:08+00:00",
      "cve": "CVE-2026-23461",
      "id": "CVE-2026-23461",
      "initial_release_date": "2026-04-03T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Bluetooth: L2CAP: Fix use-after-free in l2cap_unregister_user",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23461.json",
      "version": "3"
    }
  }
}



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Taxonomy of the tags.





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

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.


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.