Vulnerability-Lookup

FKIE_CVE-2026-74531

Vulnerability from fkie_nvd - Published: 2026-08-15 13:17 - Updated: 2026-08-23 13:16

Severity

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

Summary

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_conn: hold conn reference in abort_conn_sync() 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/5761d003daa987ac81463f570713ce9c9dd204e5
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/64d1645f26aa49b5a86ba2fccd0bb6749ea725a6
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/963fb4b8e7d1ab07b4ae45bf15d41e667c88caca
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/e8f9fef362bab431d95371d3406bc720350290c3
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/fa812cfa81aa3d4a7b6ce8277979af57b3f79712

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "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": "64d1645f26aa49b5a86ba2fccd0bb6749ea725a6",
              "status": "affected",
              "version": "249c88e7fb45b6b705040c5af4bd0d0f2bc9735c",
              "versionType": "git"
            },
            {
              "lessThan": "963fb4b8e7d1ab07b4ae45bf15d41e667c88caca",
              "status": "affected",
              "version": "227a0cdf4a028a73dc256d0f5144b4808d718893",
              "versionType": "git"
            },
            {
              "lessThan": "e8f9fef362bab431d95371d3406bc720350290c3",
              "status": "affected",
              "version": "227a0cdf4a028a73dc256d0f5144b4808d718893",
              "versionType": "git"
            },
            {
              "lessThan": "fa812cfa81aa3d4a7b6ce8277979af57b3f79712",
              "status": "affected",
              "version": "227a0cdf4a028a73dc256d0f5144b4808d718893",
              "versionType": "git"
            },
            {
              "lessThan": "5761d003daa987ac81463f570713ce9c9dd204e5",
              "status": "affected",
              "version": "227a0cdf4a028a73dc256d0f5144b4808d718893",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "7fe4d391e937c2f048a43ff4b421e677f10d83c0",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "58afdc9b18871eb1d461c725be9e9f3f44a39aeb",
              "versionType": "git"
            },
            {
              "lessThan": "6.6.151",
              "status": "affected",
              "version": "6.6.51",
              "versionType": "semver"
            },
            {
              "lessThan": "6.2",
              "status": "affected",
              "version": "6.1.184",
              "versionType": "semver"
            },
            {
              "lessThan": "6.11",
              "status": "affected",
              "version": "6.10.10",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/hci_conn.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.11"
            },
            {
              "lessThan": "6.11",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.151",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.103",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.44",
              "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_conn: hold conn reference in abort_conn_sync()\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-2026-74531",
  "lastModified": "2026-08-23T13:16:45.710",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "ADJACENT_NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-08-15T13:17:58.397",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5761d003daa987ac81463f570713ce9c9dd204e5"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/64d1645f26aa49b5a86ba2fccd0bb6749ea725a6"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/963fb4b8e7d1ab07b4ae45bf15d41e667c88caca"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e8f9fef362bab431d95371d3406bc720350290c3"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/fa812cfa81aa3d4a7b6ce8277979af57b3f79712"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

CVE-2026-74531 (GCVE-0-2026-74531)

Vulnerability from cvelistv5 – Published: 2026-08-15 12:27 – Updated: 2026-08-23 12:47

Title

Bluetooth: hci_conn: hold conn reference in abort_conn_sync()

Summary

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

5 references

URL	Tags
https://git.kernel.org/stable/c/64d1645f26aa49b5a…
https://git.kernel.org/stable/c/963fb4b8e7d1ab07b…
https://git.kernel.org/stable/c/e8f9fef362bab431d…
https://git.kernel.org/stable/c/fa812cfa81aa3d4a7…
https://git.kernel.org/stable/c/5761d003daa987ac8…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 249c88e7fb45b6b705040c5af4bd0d0f2bc9735c , < 64d1645f26aa49b5a86ba2fccd0bb6749ea725a6 (git) Affected: 227a0cdf4a028a73dc256d0f5144b4808d718893 , < 963fb4b8e7d1ab07b4ae45bf15d41e667c88caca (git) Affected: 227a0cdf4a028a73dc256d0f5144b4808d718893 , < e8f9fef362bab431d95371d3406bc720350290c3 (git) Affected: 227a0cdf4a028a73dc256d0f5144b4808d718893 , < fa812cfa81aa3d4a7b6ce8277979af57b3f79712 (git) Affected: 227a0cdf4a028a73dc256d0f5144b4808d718893 , < 5761d003daa987ac81463f570713ce9c9dd204e5 (git) Affected: 7fe4d391e937c2f048a43ff4b421e677f10d83c0 (git) Affected: 58afdc9b18871eb1d461c725be9e9f3f44a39aeb (git) Affected: 6.6.51 , < 6.6.151 (semver) Affected: 6.1.184 , < 6.2 (semver) Affected: 6.10.10 , < 6.11 (semver)
Linux	Linux	Affected: 6.11 Unaffected: 0 , < 6.11 (semver) Unaffected: 6.6.151 , ≤ 6.6.* (semver) Unaffected: 6.12.103 , ≤ 6.12.* (semver) Unaffected: 6.18.44 , ≤ 6.18.* (semver) Unaffected: 7.1.8 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "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": "64d1645f26aa49b5a86ba2fccd0bb6749ea725a6",
              "status": "affected",
              "version": "249c88e7fb45b6b705040c5af4bd0d0f2bc9735c",
              "versionType": "git"
            },
            {
              "lessThan": "963fb4b8e7d1ab07b4ae45bf15d41e667c88caca",
              "status": "affected",
              "version": "227a0cdf4a028a73dc256d0f5144b4808d718893",
              "versionType": "git"
            },
            {
              "lessThan": "e8f9fef362bab431d95371d3406bc720350290c3",
              "status": "affected",
              "version": "227a0cdf4a028a73dc256d0f5144b4808d718893",
              "versionType": "git"
            },
            {
              "lessThan": "fa812cfa81aa3d4a7b6ce8277979af57b3f79712",
              "status": "affected",
              "version": "227a0cdf4a028a73dc256d0f5144b4808d718893",
              "versionType": "git"
            },
            {
              "lessThan": "5761d003daa987ac81463f570713ce9c9dd204e5",
              "status": "affected",
              "version": "227a0cdf4a028a73dc256d0f5144b4808d718893",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "7fe4d391e937c2f048a43ff4b421e677f10d83c0",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "58afdc9b18871eb1d461c725be9e9f3f44a39aeb",
              "versionType": "git"
            },
            {
              "lessThan": "6.6.151",
              "status": "affected",
              "version": "6.6.51",
              "versionType": "semver"
            },
            {
              "lessThan": "6.2",
              "status": "affected",
              "version": "6.1.184",
              "versionType": "semver"
            },
            {
              "lessThan": "6.11",
              "status": "affected",
              "version": "6.10.10",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/hci_conn.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.11"
            },
            {
              "lessThan": "6.11",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.151",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.103",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.44",
              "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": "6.6.151",
                  "versionStartIncluding": "6.6.51",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.103",
                  "versionStartIncluding": "6.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.44",
                  "versionStartIncluding": "6.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.8",
                  "versionStartIncluding": "6.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "6.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "6.1.184",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "6.10.10",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_conn: hold conn reference in abort_conn_sync()\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": 8.8,
            "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"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:A - The flaw is in the Bluetooth HCI connection abort path reachable when a nearby attacker sends connection, authentication-failure, or disconnect traffic that drives hci_disconnect()/hci_abort_conn() through hci_event processing.\nAC:L - An adjacent attacker can repeatedly initiate, fail, and tear down connections to race asynchronous abort_conn_sync work against hci_conn_del(), controlling both sides of the timing window without depending on uncontrollable system state.\nPR:N - Exploitation requires no local account or kernel privileges; a remote Bluetooth peer within RF range can trigger hci_abort_conn() via standard HCI event handling without authenticated pairing or CAP_NET_ADMIN access.\nUI:N - No deliberate victim action beyond normal Bluetooth availability is required; exploitation works against discoverable/connectable devices and already-paired reconnections without opening files or confirming a one-off prompt.\nS:U - Impact is kernel heap corruption and potential privilege escalation within the host kernel security boundary, not a cross-boundary escape such as VM guest-to-host or IOMMU bypass.\nC:H - Use-after-free of struct hci_conn lets an attacker read freed slab memory through abort_conn_sync/hci_abort_conn_sync field accesses, enabling disclosure of kernel pointers and adjacent heap contents.\nI:H - UAF of hci_conn is heap memory corruption that can be shaped via slab reuse and exploited for arbitrary kernel writes or control-flow hijack, not merely a bounded data change.\nA:H - Accessing a freed hci_conn during abort_conn_sync can cause kernel oops, BUG, or panic, and UAF corruption can crash or hang the system even when full exploitation is not attempted."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-23T12:47:34.295Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/64d1645f26aa49b5a86ba2fccd0bb6749ea725a6"
        },
        {
          "url": "https://git.kernel.org/stable/c/963fb4b8e7d1ab07b4ae45bf15d41e667c88caca"
        },
        {
          "url": "https://git.kernel.org/stable/c/e8f9fef362bab431d95371d3406bc720350290c3"
        },
        {
          "url": "https://git.kernel.org/stable/c/fa812cfa81aa3d4a7b6ce8277979af57b3f79712"
        },
        {
          "url": "https://git.kernel.org/stable/c/5761d003daa987ac81463f570713ce9c9dd204e5"
        }
      ],
      "title": "Bluetooth: hci_conn: hold conn reference in abort_conn_sync()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74531",
    "datePublished": "2026-08-15T12:27:45.988Z",
    "dateReserved": "2026-08-15T05:44:03.912Z",
    "dateUpdated": "2026-08-23T12:47:34.295Z",
    "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.

Action not permitted

FKIE_CVE-2026-74531

CVE-2026-74531 (GCVE-0-2026-74531)

Tags

Sightings

Nomenclature