Vulnerability-Lookup

FKIE_CVE-2026-74529

Vulnerability from fkie_nvd - Published: 2026-08-15 13:17 - Updated: 2026-08-17 06:19

Severity

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sync: hold conn in hci_connect_pa_sync() callback There is theoretical UAF if the conn is freed while the hci_sync task is running. Hold refcount to avoid that.

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/44fc74069d8988f2825246f9401218e29de2c0ab
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/c53c70ec289ee12f20c4f1b2fbfd151762c01f67

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/hci_sync.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "c53c70ec289ee12f20c4f1b2fbfd151762c01f67",
              "status": "affected",
              "version": "6d0417e4e1cf66fd917f06f0454958362714ef7d",
              "versionType": "git"
            },
            {
              "lessThan": "44fc74069d8988f2825246f9401218e29de2c0ab",
              "status": "affected",
              "version": "6d0417e4e1cf66fd917f06f0454958362714ef7d",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "eb8b860e87b296bd1874c79a668081efd00f9754",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "94bf6380e936339a700c0b3171a49baf512aa70b",
              "versionType": "git"
            },
            {
              "lessThan": "6.13",
              "status": "affected",
              "version": "6.12.28",
              "versionType": "semver"
            },
            {
              "lessThan": "6.15",
              "status": "affected",
              "version": "6.14.6",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/hci_sync.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.15"
            },
            {
              "lessThan": "6.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sync: hold conn in hci_connect_pa_sync() callback\n\nThere is theoretical UAF if the conn is freed while the hci_sync task is\nrunning.\n\nHold refcount to avoid that."
    }
  ],
  "id": "CVE-2026-74529",
  "lastModified": "2026-08-17T06:19:49.770",
  "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": "2026-08-15T13:17:58.190",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/44fc74069d8988f2825246f9401218e29de2c0ab"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c53c70ec289ee12f20c4f1b2fbfd151762c01f67"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

CVE-2026-74529 (GCVE-0-2026-74529)

Vulnerability from cvelistv5 – Published: 2026-08-15 12:27 – Updated: 2026-08-17 05:48

Title

Bluetooth: hci_sync: hold conn in hci_connect_pa_sync() callback

Summary

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

2 references

URL	Tags
https://git.kernel.org/stable/c/c53c70ec289ee12f2…
https://git.kernel.org/stable/c/44fc74069d8988f28…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 6d0417e4e1cf66fd917f06f0454958362714ef7d , < c53c70ec289ee12f20c4f1b2fbfd151762c01f67 (git) Affected: 6d0417e4e1cf66fd917f06f0454958362714ef7d , < 44fc74069d8988f2825246f9401218e29de2c0ab (git) Affected: eb8b860e87b296bd1874c79a668081efd00f9754 (git) Affected: 94bf6380e936339a700c0b3171a49baf512aa70b (git) Affected: 6.12.28 , < 6.13 (semver) Affected: 6.14.6 , < 6.15 (semver)
Linux	Linux	Affected: 6.15 Unaffected: 0 , < 6.15 (semver) Unaffected: 7.1.8 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/hci_sync.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "c53c70ec289ee12f20c4f1b2fbfd151762c01f67",
              "status": "affected",
              "version": "6d0417e4e1cf66fd917f06f0454958362714ef7d",
              "versionType": "git"
            },
            {
              "lessThan": "44fc74069d8988f2825246f9401218e29de2c0ab",
              "status": "affected",
              "version": "6d0417e4e1cf66fd917f06f0454958362714ef7d",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "eb8b860e87b296bd1874c79a668081efd00f9754",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "94bf6380e936339a700c0b3171a49baf512aa70b",
              "versionType": "git"
            },
            {
              "lessThan": "6.13",
              "status": "affected",
              "version": "6.12.28",
              "versionType": "semver"
            },
            {
              "lessThan": "6.15",
              "status": "affected",
              "version": "6.14.6",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/hci_sync.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.15"
            },
            {
              "lessThan": "6.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.8",
                  "versionStartIncluding": "6.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "6.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "6.12.28",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "6.14.6",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sync: hold conn in hci_connect_pa_sync() callback\n\nThere is theoretical UAF if the conn is freed while the hci_sync task is\nrunning.\n\nHold refcount to avoid that."
        }
      ],
      "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 - Reached only via local AF_BLUETOOTH BTPROTO_ISO SOCK_SEQPACKET listen() for LE broadcast PA sync (iso_listen_bis\u2192hci_pa_create_sync\u2192hci_connect_pa_sync); no over-the-air packet parsing triggers the bug and a remote Bluetooth peer alone cannot invoke it.\nAC:L - Use-after-free race is attacker-controlled: a local process can listen() to start hci_le_pa_create_sync and immediately close/unlink the socket to drop the PA_LINK hci_conn while cmd_sync_work is still running, retrying until the callback dereferences freed memory.\nPR:L - ISO sockets perform no capability checks in iso_sock_create/bt_sock_create (only init_net), so any unprivileged local user who can open AF_BLUETOOTH sockets on a BT_ISO-capable host can reach hci_connect_pa_sync without CAP_NET_ADMIN or root.\nUI:N - Exploitation requires no victim action; the attacker opens, binds, and listens on their own ISO socket and races teardown\u2014typical on phones/headsets running LE Audio broadcast receivers with Bluetooth access granted to the attacking app/process.\nS:U - Impact stays within kernel memory via hci_conn UAF in create_pa_complete/hci_le_pa_create_sync; this is standard kernel memory corruption/privilege escalation, not a cross-boundary escape (VM, IOMMU, or sandbox).\nC:H - UAF of struct hci_conn lets an attacker influence freed slab contents and read adjacent kernel data through hci_conn_valid(), conn-\u003eflags, and conn-\u003eiso_qos dereferences during async PA sync work and error callbacks.\nI:H - Freed hci_conn is written via set_bit/clear_bit on conn-\u003eflags and error-path hci_connect_cfm()/hci_conn_add_unset in create_pa_complete; heap grooming of the reclaimed allocation enables arbitrary kernel writes and control-flow hijack.\nA:H - Dereferencing or deleting a freed hci_conn in hci_cmd_sync_work reliably causes kernel memory corruption, oops, or panic; UAFs in this subsystem have been observed to crash the host even when not fully exploited for privilege escalation."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:48:18.894Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/c53c70ec289ee12f20c4f1b2fbfd151762c01f67"
        },
        {
          "url": "https://git.kernel.org/stable/c/44fc74069d8988f2825246f9401218e29de2c0ab"
        }
      ],
      "title": "Bluetooth: hci_sync: hold conn in hci_connect_pa_sync() callback",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74529",
    "datePublished": "2026-08-15T12:27:44.783Z",
    "dateReserved": "2026-08-15T05:44:03.912Z",
    "dateUpdated": "2026-08-17T05:48:18.894Z",
    "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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FKIE_CVE-2026-74529

CVE-2026-74529 (GCVE-0-2026-74529)

Tags

Sightings

Nomenclature