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CVE-2026-43023 (GCVE-0-2026-43023)

Vulnerability from cvelistv5 – Published: 2026-05-01 14:15 – Updated: 2026-08-05 12:25
VLAI
Title
Bluetooth: SCO: fix race conditions in sco_sock_connect()
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: SCO: fix race conditions in sco_sock_connect() sco_sock_connect() checks sk_state and sk_type without holding the socket lock. Two concurrent connect() syscalls on the same socket can both pass the check and enter sco_connect(), leading to use-after-free. The buggy scenario involves three participants and was confirmed with additional logging instrumentation: Thread A (connect): HCI disconnect: Thread B (connect): sco_sock_connect(sk) sco_sock_connect(sk) sk_state==BT_OPEN sk_state==BT_OPEN (pass, no lock) (pass, no lock) sco_connect(sk): sco_connect(sk): hci_dev_lock hci_dev_lock hci_connect_sco <- blocked -> hcon1 sco_conn_add->conn1 lock_sock(sk) sco_chan_add: conn1->sk = sk sk->conn = conn1 sk_state=BT_CONNECT release_sock hci_dev_unlock hci_dev_lock sco_conn_del: lock_sock(sk) sco_chan_del: sk->conn=NULL conn1->sk=NULL sk_state= BT_CLOSED SOCK_ZAPPED release_sock hci_dev_unlock (unblocked) hci_connect_sco -> hcon2 sco_conn_add -> conn2 lock_sock(sk) sco_chan_add: sk->conn=conn2 sk_state= BT_CONNECT // zombie sk! release_sock hci_dev_unlock Thread B revives a BT_CLOSED + SOCK_ZAPPED socket back to BT_CONNECT. Subsequent cleanup triggers double sock_put() and use-after-free. Meanwhile conn1 is leaked as it was orphaned when sco_conn_del() cleared the association. Fix this by: - Moving lock_sock() before the sk_state/sk_type checks in sco_sock_connect() to serialize concurrent connect attempts - Fixing the sk_type != SOCK_SEQPACKET check to actually return the error instead of just assigning it - Adding a state re-check in sco_connect() after lock_sock() to catch state changes during the window between the locks - Adding sco_pi(sk)->conn check in sco_chan_add() to prevent double-attach of a socket to multiple connections - Adding hci_conn_drop() on sco_chan_add failure to prevent HCI connection leaks
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 70a13b1e25fef37c87c8a1228ddb8900efbca7cf , < dabf22269242e2f2bf44c43fcdc2fa763df7f9cc (git)
Affected: 9a8ec9e8ebb5a7c0cfbce2d6b4a6b67b2b78e8f3 , < adb90cd0f9f7a8d438fcb93354040fbafc5ae2a0 (git)
Affected: 9a8ec9e8ebb5a7c0cfbce2d6b4a6b67b2b78e8f3 , < 7e296ffdab5bdab718dff7c14288fdcb9154fa27 (git)
Affected: 9a8ec9e8ebb5a7c0cfbce2d6b4a6b67b2b78e8f3 , < 98c8d3bfdaa657d8f472dbbebd7ea8cd816d8a8d (git)
Affected: 9a8ec9e8ebb5a7c0cfbce2d6b4a6b67b2b78e8f3 , < d002bd11024bd231bcb606877e33951ffb7bed14 (git)
Affected: 9a8ec9e8ebb5a7c0cfbce2d6b4a6b67b2b78e8f3 , < 8a5b0135d4a5d9683203a3d9a12a711ccec5936b (git)
Affected: 6.1.109 , < 6.1.168 (semver)
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Linux Linux Affected: 6.3
Unaffected: 0 , < 6.3 (semver)
Unaffected: 6.1.168 , ≤ 6.1.* (semver)
Unaffected: 6.6.134 , ≤ 6.6.* (semver)
Unaffected: 6.12.81 , ≤ 6.12.* (semver)
Unaffected: 6.18.22 , ≤ 6.18.* (semver)
Unaffected: 6.19.12 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: SCO: fix race conditions in sco_sock_connect()\n\nsco_sock_connect() checks sk_state and sk_type without holding\nthe socket lock. Two concurrent connect() syscalls on the same\nsocket can both pass the check and enter sco_connect(), leading\nto use-after-free.\n\nThe buggy scenario involves three participants and was confirmed\nwith additional logging instrumentation:\n\n  Thread A (connect):    HCI disconnect:      Thread B (connect):\n\n  sco_sock_connect(sk)                        sco_sock_connect(sk)\n  sk_state==BT_OPEN                           sk_state==BT_OPEN\n  (pass, no lock)                             (pass, no lock)\n  sco_connect(sk):                            sco_connect(sk):\n    hci_dev_lock                                hci_dev_lock\n    hci_connect_sco                               \u003c- blocked\n      -\u003e hcon1\n    sco_conn_add-\u003econn1\n    lock_sock(sk)\n    sco_chan_add:\n      conn1-\u003esk = sk\n      sk-\u003econn = conn1\n    sk_state=BT_CONNECT\n    release_sock\n    hci_dev_unlock\n                           hci_dev_lock\n                           sco_conn_del:\n                             lock_sock(sk)\n                             sco_chan_del:\n                               sk-\u003econn=NULL\n                               conn1-\u003esk=NULL\n                               sk_state=\n                                 BT_CLOSED\n                               SOCK_ZAPPED\n                             release_sock\n                           hci_dev_unlock\n                                                  (unblocked)\n                                                  hci_connect_sco\n                                                    -\u003e hcon2\n                                                  sco_conn_add\n                                                    -\u003e conn2\n                                                  lock_sock(sk)\n                                                  sco_chan_add:\n                                                    sk-\u003econn=conn2\n                                                  sk_state=\n                                                    BT_CONNECT\n                                                  // zombie sk!\n                                                  release_sock\n                                                  hci_dev_unlock\n\nThread B revives a BT_CLOSED + SOCK_ZAPPED socket back to\nBT_CONNECT. Subsequent cleanup triggers double sock_put() and\nuse-after-free. Meanwhile conn1 is leaked as it was orphaned\nwhen sco_conn_del() cleared the association.\n\nFix this by:\n- Moving lock_sock() before the sk_state/sk_type checks in\n  sco_sock_connect() to serialize concurrent connect attempts\n- Fixing the sk_type != SOCK_SEQPACKET check to actually\n  return the error instead of just assigning it\n- Adding a state re-check in sco_connect() after lock_sock()\n  to catch state changes during the window between the locks\n- Adding sco_pi(sk)-\u003econn check in sco_chan_add() to prevent\n  double-attach of a socket to multiple connections\n- Adding hci_conn_drop() on sco_chan_add failure to prevent\n  HCI connection leaks"
          }
        ],
        "id": "CVE-2026-43023",
        "lastModified": "2026-06-17T10:48:47.027",
        "metrics": {
          "cvssMetricV31": [
            {
              "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": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-05-01T15:16:46.610",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/7e296ffdab5bdab718dff7c14288fdcb9154fa27"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/8a5b0135d4a5d9683203a3d9a12a711ccec5936b"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/98c8d3bfdaa657d8f472dbbebd7ea8cd816d8a8d"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/adb90cd0f9f7a8d438fcb93354040fbafc5ae2a0"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/d002bd11024bd231bcb606877e33951ffb7bed14"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/dabf22269242e2f2bf44c43fcdc2fa763df7f9cc"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-362"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-02T15:10:28+00:00",
      "cve": "CVE-2026-43023",
      "id": "CVE-2026-43023",
      "initial_release_date": "2026-05-01T00:00:00+00:00",
      "product_status:fixed": "1224",
      "product_status:known_affected": "22",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Bluetooth: SCO: fix race conditions in sco_sock_connect()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43023.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-08-31T17:11:23Z",
      "cve": "CVE-2026-43023",
      "id": "CVE-2026-43023",
      "initial_release_date": "2026-05-06T01:41:20Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "394",
      "product_status:known_not_affected": "294",
      "product_status:recommended": "366",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-43023",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-43023.json",
      "version": "13"
    }
  }
}



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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.


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.