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

Vulnerability from cvelistv5 – Published: 2026-08-10 11:51 – Updated: 2026-08-17 04:58
VLAI
Title
Bluetooth: hci_uart: clear HCI_UART_SENDING when write_work is canceled
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.
Severity
8 (High)
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
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)
guessed Create a notification for this product.
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)
guessed Create a notification for this product.
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          "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."
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            "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": [
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              "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."
            }
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        "dateUpdated": "2026-08-17T04:58:33.786Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/d52446b3e735cfdbdc2a58342163803bc2e64249"
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          "url": "https://git.kernel.org/stable/c/b9dd39cf1667e378b25a082ca796d495d578c5d3"
        },
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        },
        {
          "url": "https://git.kernel.org/stable/c/1b0d946d6f08bd39211385bc703a440911b41e46"
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      ],
      "title": "Bluetooth: hci_uart: clear HCI_UART_SENDING when write_work is canceled",
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    "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"
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      "date": "2026-08-20",
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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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/bluetooth/hci_ldisc.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"81c7a3c22a0f2808cf4ae0b4908f59763b23606d\",\"lessThan\":\"d52446b3e735cfdbdc2a58342163803bc2e64249\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"192cb0f1ca706d9a1bc36ae0ad5f666d1e4fd894\",\"lessThan\":\"b9dd39cf1667e378b25a082ca796d495d578c5d3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c1bb9336ae6b54a5f6a353c4bd4ed9a4307e429b\",\"lessThan\":\"714d861d35d937f23375a4517569b13917bbbe51\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c1bb9336ae6b54a5f6a353c4bd4ed9a4307e429b\",\"lessThan\":\"1b0d946d6f08bd39211385bc703a440911b41e46\",\"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\",\"status\":\"affected\"},{\"version\":\"6.12.92\",\"lessThan\":\"6.12.96\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.18.34\",\"lessThan\":\"6.18.39\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.10.258\",\"lessThan\":\"5.11\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.15.209\",\"lessThan\":\"5.16\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.1.175\",\"lessThan\":\"6.2\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.6.142\",\"lessThan\":\"6.7\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"7.0.11\",\"lessThan\":\"7.1\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/bluetooth/hci_ldisc.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"7.1\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"7.1\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.96\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.39\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.4\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":8.0,\"baseSeverity\":\"HIGH\",\"attackVector\":\"ADJACENT_NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.1,\"impactScore\":5.9}]},\"references\":[{\"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\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-13T23:19:07+00:00",
      "cve": "CVE-2026-68085",
      "id": "CVE-2026-68085",
      "initial_release_date": "2026-08-10T00:00:00+00:00",
      "product_status:known_affected": "198",
      "product_status:known_not_affected": "76",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Bluetooth: hci_uart: clear HCI_UART_SENDING when write_work is canceled",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68085.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "low",
      "current_release_date": "2026-08-11T23:48:53Z",
      "cve": "CVE-2026-68085",
      "id": "CVE-2026-68085",
      "initial_release_date": "2026-08-11T23:48:53Z",
      "product_status:known_affected": "209",
      "product_status:known_not_affected": "87",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-68085",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68085.json",
      "version": "2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.