Vulnerability-Lookup

GHSA-2QWP-9C8H-MRVC

Vulnerability from github – Published: 2026-05-01 15:30 – Updated: 2026-06-19 15:33

Details

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

Bluetooth: hci_conn: fix potential UAF in set_cig_params_sync

hci_conn lookup and field access must be covered by hdev lock in set_cig_params_sync, otherwise it's possible it is freed concurrently.

Take hdev lock to prevent hci_conn from being deleted or modified concurrently. Just RCU lock is not suitable here, as we also want to avoid "tearing" in the configuration.

Severity

7.8 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-43019"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-01T15:16:46Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_conn: fix potential UAF in set_cig_params_sync\n\nhci_conn lookup and field access must be covered by hdev lock in\nset_cig_params_sync, otherwise it\u0027s possible it is freed concurrently.\n\nTake hdev lock to prevent hci_conn from being deleted or modified\nconcurrently.  Just RCU lock is not suitable here, as we also want to\navoid \"tearing\" in the configuration.",
  "id": "GHSA-2qwp-9c8h-mrvc",
  "modified": "2026-06-19T15:33:09Z",
  "published": "2026-05-01T15:30:36Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43019"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/66d432e9b45bae7881ffcdb12cd8fd0bf254ef02"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7502c1cf303b69f71d085f5ff7251b0e1b0f09df"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7d568fede8eac91161a60b710aa920abe9b0fb9f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a2639a7f0f5bf7d73f337f8f077c19415c62ed2c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bad65b4b0a96139f023eadc28a33125963208449"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-43019 (GCVE-0-2026-43019)

Vulnerability from cvelistv5 – Published: 2026-05-01 14:15 – Updated: 2026-08-05 12:25

Title

Bluetooth: hci_conn: fix potential UAF in set_cig_params_sync

Summary

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_conn: fix potential UAF in set_cig_params_sync hci_conn lookup and field access must be covered by hdev lock in set_cig_params_sync, otherwise it's possible it is freed concurrently. Take hdev lock to prevent hci_conn from being deleted or modified concurrently. Just RCU lock is not suitable here, as we also want to avoid "tearing" in the configuration.

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/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/7502c1cf303b69f71…
https://git.kernel.org/stable/c/66d432e9b45bae788…
https://git.kernel.org/stable/c/7d568fede8eac9116…
https://git.kernel.org/stable/c/bad65b4b0a96139f0…
https://git.kernel.org/stable/c/a2639a7f0f5bf7d73…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: a091289218202bc09d9b9caa8afcde1018584aec , < 7502c1cf303b69f71d085f5ff7251b0e1b0f09df (git) Affected: a091289218202bc09d9b9caa8afcde1018584aec , < 66d432e9b45bae7881ffcdb12cd8fd0bf254ef02 (git) Affected: a091289218202bc09d9b9caa8afcde1018584aec , < 7d568fede8eac91161a60b710aa920abe9b0fb9f (git) Affected: a091289218202bc09d9b9caa8afcde1018584aec , < bad65b4b0a96139f023eadc28a33125963208449 (git) Affected: a091289218202bc09d9b9caa8afcde1018584aec , < a2639a7f0f5bf7d73f337f8f077c19415c62ed2c (git) Affected: 3a273cd0f47dd672d37736e623849374f9ab9ce9 (git) Affected: d8570c4c3f2a3e51b3c8b5e6ec898364c5c03062 (git) Affected: 6.4.16 , < 6.5 (semver) Affected: 6.5.3 , < 6.6 (semver)
Linux	Linux	Affected: 6.6 Unaffected: 0 , < 6.6 (semver) Unaffected: 6.6.143 , ≤ 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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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/hci_conn.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "7502c1cf303b69f71d085f5ff7251b0e1b0f09df",
              "status": "affected",
              "version": "a091289218202bc09d9b9caa8afcde1018584aec",
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            {
              "lessThan": "66d432e9b45bae7881ffcdb12cd8fd0bf254ef02",
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              "version": "a091289218202bc09d9b9caa8afcde1018584aec",
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              "versionType": "git"
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              "status": "affected",
              "version": "3a273cd0f47dd672d37736e623849374f9ab9ce9",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "d8570c4c3f2a3e51b3c8b5e6ec898364c5c03062",
              "versionType": "git"
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              "version": "6.4.16",
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            },
            {
              "lessThan": "6.6",
              "status": "affected",
              "version": "6.5.3",
              "versionType": "semver"
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          "versions": [
            {
              "status": "affected",
              "version": "6.6"
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.143",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.81",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.22",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.12",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.143",
                  "versionStartIncluding": "6.6",
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                },
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                {
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                  "versionStartIncluding": "6.6",
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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                {
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                  "versionStartIncluding": "6.4.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "6.5.3",
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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_conn: fix potential UAF in set_cig_params_sync\n\nhci_conn lookup and field access must be covered by hdev lock in\nset_cig_params_sync, otherwise it\u0027s possible it is freed concurrently.\n\nTake hdev lock to prevent hci_conn from being deleted or modified\nconcurrently.  Just RCU lock is not suitable here, as we also want to\navoid \"tearing\" in the configuration."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable `set_cig_params_sync` path is reached through local AF_BLUETOOTH ISO socket operations such as creating a `BTPROTO_ISO` socket, setting ISO QoS/deferred setup, and calling `connect()` or deferred `recvmsg()`. A Bluetooth peer may be involved in normal CIS use, but the vulnerable queueing and racing can be driven by local socket syscalls.\nAC:L - The bug is a race/use-after-free, but the attacker can control the relevant operations by repeatedly creating/binding/connecting and closing ISO sockets while the HCI command work item runs asynchronously. The fix adds `hci_dev_lock`, indicating normal locking, not rare external state, is the missing condition.\nPR:L - AF_BLUETOOTH ISO socket creation and the relevant `BT_ISO_QOS`, `BT_DEFER_SETUP`, and `connect()` path do not require CAP_NET_ADMIN or another privileged check in the inspected path. The attacker needs local code execution as an unprivileged user on a system with a running Bluetooth ISO-capable controller.\nUI:N - No victim action is required once the local attacker can execute socket syscalls. The attacker can create, configure, connect, and close the sockets directly.\nS:U - The vulnerability corrupts or reuses memory within the kernel Bluetooth/HCI connection management context. Exploitation would be kernel compromise or denial of service within the same security authority, not a boundary crossing such as guest-to-host escape.\nC:H - This is a use-after-free of `struct hci_conn`, with freed object fields read after lookup without holding the device lock. Per kernel UAF scoring guidance and plausible heap reuse, this can support high confidentiality impact.\nI:H - The stale `hci_conn` contents are used to build HCI command parameters, and UAF conditions in kernel heap objects are generally exploitable with heap grooming for control/data corruption. Following the required higher-severity rule for UAFs, integrity impact is High.\nA:H - A stale `hci_conn` dereference in asynchronous HCI command work can trigger kernel memory safety failures, including KASAN-detected slab-use-after-free, oops, or panic. Repeated local triggering makes denial of service high impact."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:25:18.558Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/7502c1cf303b69f71d085f5ff7251b0e1b0f09df"
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        },
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          "url": "https://git.kernel.org/stable/c/7d568fede8eac91161a60b710aa920abe9b0fb9f"
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        {
          "url": "https://git.kernel.org/stable/c/bad65b4b0a96139f023eadc28a33125963208449"
        },
        {
          "url": "https://git.kernel.org/stable/c/a2639a7f0f5bf7d73f337f8f077c19415c62ed2c"
        }
      ],
      "title": "Bluetooth: hci_conn: fix potential UAF in set_cig_params_sync",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43019",
    "datePublished": "2026-05-01T14:15:23.035Z",
    "dateReserved": "2026-05-01T14:12:55.975Z",
    "dateUpdated": "2026-08-05T12:25:18.558Z",
    "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.
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