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CVE-2026-68391 (GCVE-0-2026-68391)

Vulnerability from cvelistv5 – Published: 2026-08-10 12:04 – Updated: 2026-08-17 05:04
VLAI
Title
Bluetooth: mgmt: hold reference for hci_conn in mgmt_pending_cmds
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: mgmt: hold reference for hci_conn in mgmt_pending_cmds Dereferencing RCU-protected pointers outside critical sections is invalid and may lead to UAF. Use of hci_conn in hci_sync callbacks also needs to hold refcount to avoid UAF. Take appropriate locks for hci_conn lookups, and take refcount for hci_conn pointers stored in mgmt_pending_cmd so that the pointer stays valid. When accessing conn->state, ensure hdev->lock is held to avoid data race.
Severity
7.8 (High)
CVSS:3.1/AV:L/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: 7b445e220db9a2c58be5d09bbbd322abf1b1452a , < b56f2ecafc08f372bf0529f9c4f3f429cb1702dc (git)
Affected: 7b445e220db9a2c58be5d09bbbd322abf1b1452a , < f915e74b6f18293d1d69a2a3305ef321ff7c0172 (git)
Affected: 7b445e220db9a2c58be5d09bbbd322abf1b1452a , < d5b3b484b62bb0f4542e7622789d28871626cdf0 (git)
Affected: 7b445e220db9a2c58be5d09bbbd322abf1b1452a , < ecdcb55ea1c01dda074406f38058785a69526734 (git)
Affected: 7b445e220db9a2c58be5d09bbbd322abf1b1452a , < da55f570191d5d72f10c607a7043b947eb05ea46 (git)
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Linux Linux Affected: 6.0
Unaffected: 0 , < 6.0 (semver)
Unaffected: 6.6.148 , ≤ 6.6.* (semver)
Unaffected: 6.12.101 , ≤ 6.12.* (semver)
Unaffected: 6.18.42 , ≤ 6.18.* (semver)
Unaffected: 7.1.6 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/mgmt.c"
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          "vendor": "Linux",
          "versions": [
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              "version": "0",
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              "versionType": "semver"
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              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.18.42",
              "versionType": "semver"
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              "version": "7.1.6",
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              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
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        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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                  "versionStartIncluding": "6.0",
                  "vulnerable": true
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: mgmt: hold reference for hci_conn in mgmt_pending_cmds\n\nDereferencing RCU-protected pointers outside critical sections is\ninvalid and may lead to UAF.  Use of hci_conn in hci_sync callbacks also\nneeds to hold refcount to avoid UAF.\n\nTake appropriate locks for hci_conn lookups, and take refcount for\nhci_conn pointers stored in mgmt_pending_cmd so that the pointer stays\nvalid.\n\nWhen accessing conn-\u003estate, ensure hdev-\u003elock is held to avoid data\nrace."
        }
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            "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"
          },
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              "lang": "en",
              "value": "AV:L - Both sides of the race are local: the vulnerable path is entered only by writing MGMT_OP_GET_CONN_INFO/MGMT_OP_GET_CLOCK_INFO to an AF_BLUETOOTH/BTPROTO_HCI socket bound to HCI_CHANNEL_CONTROL, and the free is driven by a local disconnect/device-teardown. A remote or adjacent Bluetooth peer cannot inject mgmt commands, so the vector is local even though the subsystem is Bluetooth.\nAC:L - The attacker owns both sides of the race: one thread loops GET_CONN_INFO/GET_CLOCK_INFO, whose sync callback blocks in __hci_cmd_sync waiting on the controller for up to HCI_CMD_TIMEOUT, while another issues MGMT_OP_DISCONNECT or HCIDEVDOWN to free the hci_conn inside that wide window; with an emulated controller the response timing is fully controlled, and the sequence can be retried indefinitely.\nPR:L - The opcodes lack HCI_MGMT_UNTRUSTED so they need a trusted mgmt socket (CAP_NET_ADMIN), which kernel CNA practice for the Bluetooth mgmt interface treats as low privilege: it is a delegable capability held by the non-root bluetoothd service account and Android\u0027s sandboxed Bluetooth process rather than full init-namespace root.\nUI:N - The attacker performs every step itself \u2014 queueing the mgmt command and tearing down the connection or the HCI index \u2014 with no victim action, pairing, or user-initiated Bluetooth operation required.\nS:U - The use-after-free and the resulting heap corruption stay entirely within the kernel\u0027s own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - get_conn_info_complete()/get_clock_info_complete() read rssi, tx_power, max_tx_power, clock and clock_accuracy from a freed hci_conn and return them to userspace over the mgmt socket; hci_conn comes from a general-purpose kmalloc cache, so grooming the reclaimed slab turns this into a repeatable kernel-memory disclosure oracle.\nI:H - The dangling cmd-\u003euser_data points at a freed, sprayable struct-device-embedded object that can be reclaimed with attacker-shaped data and is later put/released, and the unlocked lookup also propagates a stale conn-\u003ehandle into hci_read_rssi_sync/hci_read_clock_sync so the host acts on a handle that may have been reused by another link \u2014 sufficient for controlled corruption after heap grooming.\nA:H - Dereferencing the freed hci_conn in the hci_cmd_sync completion callback is a slab use-after-free that produces a KASAN splat and can oops or panic the kernel when the slab has been returned to the page allocator, and it can be re-triggered in a loop for sustained denial of service."
            }
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        }
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      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:04:39.043Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/b56f2ecafc08f372bf0529f9c4f3f429cb1702dc"
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          "url": "https://git.kernel.org/stable/c/f915e74b6f18293d1d69a2a3305ef321ff7c0172"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-68391",
    "datePublished": "2026-08-10T12:04:10.564Z",
    "dateReserved": "2026-07-30T09:28:09.388Z",
    "dateUpdated": "2026-08-17T05:04:39.043Z",
    "state": "PUBLISHED"
  },
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      "date": "2026-09-10",
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      "percentile": "0.02822"
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-13T23:28:20+00:00",
      "cve": "CVE-2026-68391",
      "id": "CVE-2026-68391",
      "initial_release_date": "2026-08-10T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Bluetooth: mgmt: hold reference for hci_conn in mgmt_pending_cmds",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68391.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-09T00:03:36Z",
      "cve": "CVE-2026-68391",
      "id": "CVE-2026-68391",
      "initial_release_date": "2026-08-13T16:22:38Z",
      "product_status:first_fixed": "83",
      "product_status:known_affected": "88",
      "product_status:known_not_affected": "269",
      "product_status:recommended": "11",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-68391",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68391.json",
      "version": "3"
    }
  }
}



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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.