Vulnerability-Lookup

FKIE_CVE-2026-68085

Vulnerability from fkie_nvd - Published: 2026-08-10 12:17 - Updated: 2026-08-17 05:18

Severity

8.0 (High) - CVSS:3.1/AV:A/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_uart: clear HCI_UART_SENDING when write_work is canceled HCI_UART_SENDING bit in tx_state means write_work is pending and blocks queueing it again. Currently this bit is not cleared when canceling the work in hci_uart_close(), which blocks future writes when device is reopened later if write_work was pending. Fix by clearing HCI_UART_SENDING when canceling the work. Also make clearing of tx_skb safe by using disable_work_sync + enable_work instead of just cancel_work_sync. hci_uart_flush() purges the proto tx queue so we can cancel the pending write_work there, instead of doing it just in hci_uart_close(). Re-enable and possibly requeue the work after queue flush.

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/1b0d946d6f08bd39211385bc703a440911b41e46
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/714d861d35d937f23375a4517569b13917bbbe51
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/b9dd39cf1667e378b25a082ca796d495d578c5d3
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/d52446b3e735cfdbdc2a58342163803bc2e64249

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/bluetooth/hci_ldisc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "d52446b3e735cfdbdc2a58342163803bc2e64249",
              "status": "affected",
              "version": "81c7a3c22a0f2808cf4ae0b4908f59763b23606d",
              "versionType": "git"
            },
            {
              "lessThan": "b9dd39cf1667e378b25a082ca796d495d578c5d3",
              "status": "affected",
              "version": "192cb0f1ca706d9a1bc36ae0ad5f666d1e4fd894",
              "versionType": "git"
            },
            {
              "lessThan": "714d861d35d937f23375a4517569b13917bbbe51",
              "status": "affected",
              "version": "c1bb9336ae6b54a5f6a353c4bd4ed9a4307e429b",
              "versionType": "git"
            },
            {
              "lessThan": "1b0d946d6f08bd39211385bc703a440911b41e46",
              "status": "affected",
              "version": "c1bb9336ae6b54a5f6a353c4bd4ed9a4307e429b",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "78aad93e938f013d9272fe0ee168f27883afa95c",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "e2d19969c8d9198ecc3090bcd5312ecd503a3339",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "c85cff648a2bc92322912db5f1727ad05afae7b6",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "9d20d48be2c4a071fb015eb09bda2cecd25daf34",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "7338031946bd06f6dff149e67b60c4cd083bfea8",
              "versionType": "git"
            },
            {
              "lessThan": "6.12.96",
              "status": "affected",
              "version": "6.12.92",
              "versionType": "semver"
            },
            {
              "lessThan": "6.18.39",
              "status": "affected",
              "version": "6.18.34",
              "versionType": "semver"
            },
            {
              "lessThan": "5.11",
              "status": "affected",
              "version": "5.10.258",
              "versionType": "semver"
            },
            {
              "lessThan": "5.16",
              "status": "affected",
              "version": "5.15.209",
              "versionType": "semver"
            },
            {
              "lessThan": "6.2",
              "status": "affected",
              "version": "6.1.175",
              "versionType": "semver"
            },
            {
              "lessThan": "6.7",
              "status": "affected",
              "version": "6.6.142",
              "versionType": "semver"
            },
            {
              "lessThan": "7.1",
              "status": "affected",
              "version": "7.0.11",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/bluetooth/hci_ldisc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "7.1"
            },
            {
              "lessThan": "7.1",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.96",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.39",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.4",
              "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_uart: clear HCI_UART_SENDING when write_work is canceled\n\nHCI_UART_SENDING bit in tx_state means write_work is pending and blocks\nqueueing it again.  Currently this bit is not cleared when canceling the\nwork in hci_uart_close(), which blocks future writes when device is\nreopened later if write_work was pending.\n\nFix by clearing HCI_UART_SENDING when canceling the work.\n\nAlso make clearing of tx_skb safe by using disable_work_sync +\nenable_work instead of just cancel_work_sync.  hci_uart_flush() purges\nthe proto tx queue so we can cancel the pending write_work there,\ninstead of doing it just in hci_uart_close().  Re-enable and possibly\nrequeue the work after queue flush."
    }
  ],
  "id": "CVE-2026-68085",
  "lastModified": "2026-08-17T05:18:07.737",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "ADJACENT_NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.0,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.1,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-08-10T12:17:21.060",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1b0d946d6f08bd39211385bc703a440911b41e46"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/714d861d35d937f23375a4517569b13917bbbe51"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b9dd39cf1667e378b25a082ca796d495d578c5d3"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d52446b3e735cfdbdc2a58342163803bc2e64249"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

CVE-2026-68085 (GCVE-0-2026-68085)

Vulnerability from cvelistv5 – Published: 2026-08-10 11:51 – Updated: 2026-08-17 04:58

Title

Bluetooth: hci_uart: clear HCI_UART_SENDING when write_work is canceled

Summary

Severity

8 (High)


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

Assigner

Linux mitre root Scorecard

References

4 references

URL	Tags
https://git.kernel.org/stable/c/d52446b3e735cfdbd…
https://git.kernel.org/stable/c/b9dd39cf1667e378b…
https://git.kernel.org/stable/c/714d861d35d937f23…
https://git.kernel.org/stable/c/1b0d946d6f08bd392…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 81c7a3c22a0f2808cf4ae0b4908f59763b23606d , < d52446b3e735cfdbdc2a58342163803bc2e64249 (git) Affected: 192cb0f1ca706d9a1bc36ae0ad5f666d1e4fd894 , < b9dd39cf1667e378b25a082ca796d495d578c5d3 (git) Affected: c1bb9336ae6b54a5f6a353c4bd4ed9a4307e429b , < 714d861d35d937f23375a4517569b13917bbbe51 (git) Affected: c1bb9336ae6b54a5f6a353c4bd4ed9a4307e429b , < 1b0d946d6f08bd39211385bc703a440911b41e46 (git) Affected: 78aad93e938f013d9272fe0ee168f27883afa95c (git) Affected: e2d19969c8d9198ecc3090bcd5312ecd503a3339 (git) Affected: c85cff648a2bc92322912db5f1727ad05afae7b6 (git) Affected: 9d20d48be2c4a071fb015eb09bda2cecd25daf34 (git) Affected: 7338031946bd06f6dff149e67b60c4cd083bfea8 (git) Affected: 6.12.92 , < 6.12.96 (semver) Affected: 6.18.34 , < 6.18.39 (semver) Affected: 5.10.258 , < 5.11 (semver) Affected: 5.15.209 , < 5.16 (semver) Affected: 6.1.175 , < 6.2 (semver) Affected: 6.6.142 , < 6.7 (semver) Affected: 7.0.11 , < 7.1 (semver)
Linux	Linux	Affected: 7.1 Unaffected: 0 , < 7.1 (semver) Unaffected: 6.12.96 , ≤ 6.12.* (semver) Unaffected: 6.18.39 , ≤ 6.18.* (semver) Unaffected: 7.1.4 , ≤ 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": [
            "drivers/bluetooth/hci_ldisc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "d52446b3e735cfdbdc2a58342163803bc2e64249",
              "status": "affected",
              "version": "81c7a3c22a0f2808cf4ae0b4908f59763b23606d",
              "versionType": "git"
            },
            {
              "lessThan": "b9dd39cf1667e378b25a082ca796d495d578c5d3",
              "status": "affected",
              "version": "192cb0f1ca706d9a1bc36ae0ad5f666d1e4fd894",
              "versionType": "git"
            },
            {
              "lessThan": "714d861d35d937f23375a4517569b13917bbbe51",
              "status": "affected",
              "version": "c1bb9336ae6b54a5f6a353c4bd4ed9a4307e429b",
              "versionType": "git"
            },
            {
              "lessThan": "1b0d946d6f08bd39211385bc703a440911b41e46",
              "status": "affected",
              "version": "c1bb9336ae6b54a5f6a353c4bd4ed9a4307e429b",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "78aad93e938f013d9272fe0ee168f27883afa95c",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "e2d19969c8d9198ecc3090bcd5312ecd503a3339",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "c85cff648a2bc92322912db5f1727ad05afae7b6",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "9d20d48be2c4a071fb015eb09bda2cecd25daf34",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "7338031946bd06f6dff149e67b60c4cd083bfea8",
              "versionType": "git"
            },
            {
              "lessThan": "6.12.96",
              "status": "affected",
              "version": "6.12.92",
              "versionType": "semver"
            },
            {
              "lessThan": "6.18.39",
              "status": "affected",
              "version": "6.18.34",
              "versionType": "semver"
            },
            {
              "lessThan": "5.11",
              "status": "affected",
              "version": "5.10.258",
              "versionType": "semver"
            },
            {
              "lessThan": "5.16",
              "status": "affected",
              "version": "5.15.209",
              "versionType": "semver"
            },
            {
              "lessThan": "6.2",
              "status": "affected",
              "version": "6.1.175",
              "versionType": "semver"
            },
            {
              "lessThan": "6.7",
              "status": "affected",
              "version": "6.6.142",
              "versionType": "semver"
            },
            {
              "lessThan": "7.1",
              "status": "affected",
              "version": "7.0.11",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/bluetooth/hci_ldisc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "7.1"
            },
            {
              "lessThan": "7.1",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.96",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.39",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.4",
              "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": "6.12.96",
                  "versionStartIncluding": "6.12.92",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.39",
                  "versionStartIncluding": "6.18.34",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.4",
                  "versionStartIncluding": "7.1",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "7.1",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "5.10.258",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "5.15.209",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "6.1.175",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "6.6.142",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "7.0.11",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_uart: clear HCI_UART_SENDING when write_work is canceled\n\nHCI_UART_SENDING bit in tx_state means write_work is pending and blocks\nqueueing it again.  Currently this bit is not cleared when canceling the\nwork in hci_uart_close(), which blocks future writes when device is\nreopened later if write_work was pending.\n\nFix by clearing HCI_UART_SENDING when canceling the work.\n\nAlso make clearing of tx_skb safe by using disable_work_sync +\nenable_work instead of just cancel_work_sync.  hci_uart_flush() purges\nthe proto tx queue so we can cancel the pending write_work there,\ninstead of doing it just in hci_uart_close().  Re-enable and possibly\nrequeue the work after queue flush."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:L/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 UART TX teardown path; an adjacent Bluetooth peer can drive HCI traffic to keep write_work pending while privileged stack management (HCIDEVRESET/close during adapter recovery) executes hci_uart_close/flush.\nAC:L - An attacker controls both sides of the race by generating HCI TX to set HCI_UART_SENDING and concurrently triggering adapter close/reset (e.g., HCIDEVRESET), making the stuck-bit and tx_skb teardown races reliably reachable.\nPR:L - Direct exploitation requires CAP_NET_ADMIN to attach the N_HCI TTY line discipline and issue HCIDEVDOWN/HCIDEVRESET ioctls; this capability is available to unprivileged users inside user namespaces, not only init-namespace root.\nUI:N - No victim interaction is required beyond normal Bluetooth operation; exploitation is achieved through attacker-driven HCI traffic and adapter close/reset timing without the user opening files or confirming prompts.\nS:U - Impact is confined to kernel Bluetooth/UART state on the host (permanent TX failure or kernel crash); it does not cross a VM, container, or IOMMU security boundary to affect a different authority.\nC:H - The vulnerable hci_uart_flush path can race with protocol timers requeueing write_work, causing tx_skb double-free/UAF heap corruption that can expose kernel memory contents, not merely a functional TX stall.\nI:H - Concurrent flush and write_work on tx_skb enables heap corruption primitives typical of double-free/UAF bugs in the kernel slab allocator, which can be leveraged for arbitrary memory writes and code execution.\nA:H - Leaving HCI_UART_SENDING set after cancel permanently blocks all future Bluetooth transmissions after reopen until full teardown, and the tx_skb corruption race can trigger kernel oops/panic."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T04:58:33.786Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/d52446b3e735cfdbdc2a58342163803bc2e64249"
        },
        {
          "url": "https://git.kernel.org/stable/c/b9dd39cf1667e378b25a082ca796d495d578c5d3"
        },
        {
          "url": "https://git.kernel.org/stable/c/714d861d35d937f23375a4517569b13917bbbe51"
        },
        {
          "url": "https://git.kernel.org/stable/c/1b0d946d6f08bd39211385bc703a440911b41e46"
        }
      ],
      "title": "Bluetooth: hci_uart: clear HCI_UART_SENDING when write_work is canceled",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-68085",
    "datePublished": "2026-08-10T11:51:39.079Z",
    "dateReserved": "2026-07-30T09:28:09.367Z",
    "dateUpdated": "2026-08-17T04:58:33.786Z",
    "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.

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.

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FKIE_CVE-2026-68085

CVE-2026-68085 (GCVE-0-2026-68085)

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Related by attack behaviour