Vulnerability-Lookup

GHSA-V6C2-56H6-9PGQ

Vulnerability from github – Published: 2026-05-27 15:33 – Updated: 2026-06-19 15:33

Details

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: hci_event: fix potential UAF in SSP passkey handlers

hci_conn lookup and field access must be covered by hdev lock in hci_user_passkey_notify_evt() and hci_keypress_notify_evt(), otherwise the connection can be freed concurrently.

Extend the hci_dev_lock critical section to cover all conn usage in both handlers.

Keep the existing keypress notification behavior unchanged by routing the early exits through a common unlock path.

Severity

8.8 (High)


                  
                    CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-46056"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-27T14:17:25Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_event: fix potential UAF in SSP passkey handlers\n\nhci_conn lookup and field access must be covered by hdev lock in\nhci_user_passkey_notify_evt() and hci_keypress_notify_evt(), otherwise\nthe connection can be freed concurrently.\n\nExtend the hci_dev_lock critical section to cover all conn usage in both\nhandlers.\n\nKeep the existing keypress notification behavior unchanged by routing\nthe early exits through a common unlock path.",
  "id": "GHSA-v6c2-56h6-9pgq",
  "modified": "2026-06-19T15:33:13Z",
  "published": "2026-05-27T15:33:22Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46056"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/01a6431766c35dfedb86e0cb5d3fc80c6d604a47"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/204028af77a265e31ceb4ba7f643349a3cca72b2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/85fa3512048793076eef658f66489112dcc91993"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8c6443bb9257b780986fb67ec08565bf48ecb8d7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b6ae482f88654db407c8c17619d4b62959b903ef"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d28311539ac9f65e29308ea219ecaa48aa5e76e5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e08d75753db17aa943d7622f09d9c217b5bfd3b8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ea18732d2614557e59f4c0d8cdbe6611aeab33b7"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-46056 (GCVE-0-2026-46056)

Vulnerability from cvelistv5 – Published: 2026-05-27 12:57 – Updated: 2026-08-05 12:29

Title

Bluetooth: hci_event: fix potential UAF in SSP passkey handlers

Summary

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_event: fix potential UAF in SSP passkey handlers hci_conn lookup and field access must be covered by hdev lock in hci_user_passkey_notify_evt() and hci_keypress_notify_evt(), otherwise the connection can be freed concurrently. Extend the hci_dev_lock critical section to cover all conn usage in both handlers. Keep the existing keypress notification behavior unchanged by routing the early exits through a common unlock path.

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

8 references

URL	Tags
https://git.kernel.org/stable/c/ea18732d2614557e5…
https://git.kernel.org/stable/c/d28311539ac9f65e2…
https://git.kernel.org/stable/c/b6ae482f88654db40…
https://git.kernel.org/stable/c/204028af77a265e31…
https://git.kernel.org/stable/c/01a6431766c35dfed…
https://git.kernel.org/stable/c/e08d75753db17aa94…
https://git.kernel.org/stable/c/8c6443bb9257b7809…
https://git.kernel.org/stable/c/85fa3512048793076…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 92a25256f142d55e25f9959441cea6ddeabae57e , < ea18732d2614557e59f4c0d8cdbe6611aeab33b7 (git) Affected: 92a25256f142d55e25f9959441cea6ddeabae57e , < d28311539ac9f65e29308ea219ecaa48aa5e76e5 (git) Affected: 92a25256f142d55e25f9959441cea6ddeabae57e , < b6ae482f88654db407c8c17619d4b62959b903ef (git) Affected: 92a25256f142d55e25f9959441cea6ddeabae57e , < 204028af77a265e31ceb4ba7f643349a3cca72b2 (git) Affected: 92a25256f142d55e25f9959441cea6ddeabae57e , < 01a6431766c35dfedb86e0cb5d3fc80c6d604a47 (git) Affected: 92a25256f142d55e25f9959441cea6ddeabae57e , < e08d75753db17aa943d7622f09d9c217b5bfd3b8 (git) Affected: 92a25256f142d55e25f9959441cea6ddeabae57e , < 8c6443bb9257b780986fb67ec08565bf48ecb8d7 (git) Affected: 92a25256f142d55e25f9959441cea6ddeabae57e , < 85fa3512048793076eef658f66489112dcc91993 (git)
Linux	Linux	Affected: 3.7 Unaffected: 0 , < 3.7 (semver) Unaffected: 5.10.259 , ≤ 5.10.* (semver) Unaffected: 5.15.210 , ≤ 5.15.* (semver) Unaffected: 6.1.175 , ≤ 6.1.* (semver) Unaffected: 6.6.140 , ≤ 6.6.* (semver) Unaffected: 6.12.86 , ≤ 6.12.* (semver) Unaffected: 6.18.27 , ≤ 6.18.* (semver) Unaffected: 7.0.4 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/hci_event.c"
          ],
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          "vendor": "Linux",
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              "status": "affected",
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              "versionType": "git"
            },
            {
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          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "3.7"
            },
            {
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "5.10.259",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.210",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "6.1.175",
              "versionType": "semver"
            },
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              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.86",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "6.18.27",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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              "cpeMatch": [
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                {
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                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "3.7",
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              ],
              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_event: fix potential UAF in SSP passkey handlers\n\nhci_conn lookup and field access must be covered by hdev lock in\nhci_user_passkey_notify_evt() and hci_keypress_notify_evt(), otherwise\nthe connection can be freed concurrently.\n\nExtend the hci_dev_lock critical section to cover all conn usage in both\nhandlers.\n\nKeep the existing keypress notification behavior unchanged by routing\nthe early exits through a common unlock path."
        }
      ],
      "metrics": [
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            "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"
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            {
              "lang": "en",
              "value": "AV:A - The vulnerable handlers process HCI Secure Simple Pairing events (User Passkey Notify / Keypress Notify) driven by a remote Bluetooth peer during SSP pairing, so the attacker must be within Bluetooth radio range (adjacent), matching kernel guidance that Bluetooth = Adjacent.\nAC:L - This is a use-after-free where a remote peer drives the passkey/keypress events while connection teardown frees the conn from a concurrent context; the attacker influences both sides of the race and can retry, and UAF bugs are scored AC:L unless the race is uncontrollable.\nPR:N - The code path is reached by a remote Bluetooth device participating in the SSP pairing handshake, requiring no credentials or privileges on the target system.\nUI:N - The handlers execute automatically when the controller forwards the SSP passkey/keypress HCI events during the pairing protocol exchange; no local user action is required to reach the vulnerable code.\nS:U - The corruption is confined to kernel memory within the same security authority; there is no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - The use-after-free reads fields (dst, type, dst_type, passkey) from a freed and potentially reallocated hci_conn object, which can disclose attacker-controlled or sensitive kernel heap contents.\nI:H - The handlers write to the freed object (passkey_notify and passkey_entered fields), giving a UAF write into reallocated heap memory that can be leveraged for heap grooming and control-flow corruption.\nA:H - A use-after-free on the hci_conn structure readily causes kernel oops/panic, yielding high availability impact."
            }
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        }
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        "dateUpdated": "2026-08-05T12:29:24.462Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
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          "url": "https://git.kernel.org/stable/c/b6ae482f88654db407c8c17619d4b62959b903ef"
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          "url": "https://git.kernel.org/stable/c/e08d75753db17aa943d7622f09d9c217b5bfd3b8"
        },
        {
          "url": "https://git.kernel.org/stable/c/8c6443bb9257b780986fb67ec08565bf48ecb8d7"
        },
        {
          "url": "https://git.kernel.org/stable/c/85fa3512048793076eef658f66489112dcc91993"
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      "title": "Bluetooth: hci_event: fix potential UAF in SSP passkey handlers",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46056",
    "datePublished": "2026-05-27T12:57:15.150Z",
    "dateReserved": "2026-05-13T15:03:33.094Z",
    "dateUpdated": "2026-08-05T12:29:24.462Z",
    "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.

Detection rules are retrieved from Rulezet.

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.

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.