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CVE-2026-68394 (GCVE-0-2026-68394)

Vulnerability from cvelistv5 – Published: 2026-08-10 12:04 – Updated: 2026-08-17 05:04
VLAI
Title
Bluetooth: MGMT: revalidate LOAD_CONN_PARAM queued update
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: MGMT: revalidate LOAD_CONN_PARAM queued update MGMT_OP_LOAD_CONN_PARAM queues conn_update_sync() when a single parameter update changes an existing LE central connection. The queued work currently stores a borrowed hci_conn_params entry from hdev->le_conn_params. A later LOAD_CONN_PARAM request can clear disabled parameters and free that entry before hci_cmd_sync_work() runs the queued callback. Do not keep the borrowed hci_conn_params pointer in queued work. Queue the hci_conn instead and hold a reference until the queued callback completes. When the work runs, revalidate that the connection is still present, look up the current hci_conn_params entry, and cancel the update if userspace removed that entry while the work was pending. Copy the interval values from the current params entry under hdev->lock, then drop the lock and keep using hci_le_conn_update_sync() to issue the update. Validation reproduced this kernel report: BUG: KASAN: slab-use-after-free in conn_update_sync+0x2a/0xf0 [bluetooth] Read of size 1 at addr ffff88810c697126 by task kworker/u17:0/377 Workqueue: hci0 hci_cmd_sync_work [bluetooth] Call Trace: <TASK> dump_stack_lvl+0x66/0xa0 print_report+0xce/0x5f0 kasan_report+0xe0/0x110 conn_update_sync+0x2a/0xf0 [bluetooth] hci_cmd_sync_work+0x187/0x210 [bluetooth] process_one_work+0x4fd/0xbc0 worker_thread+0x2d8/0x570 kthread+0x1ad/0x1f0 ret_from_fork+0x3c9/0x540 ret_from_fork_asm+0x1a/0x30 Allocated by task 466: hci_conn_params_add+0xa6/0x240 [bluetooth] load_conn_param+0x4e1/0x850 [bluetooth] hci_sock_sendmsg+0x96b/0xf80 [bluetooth] Freed by task 474: kfree+0x313/0x590 hci_conn_params_clear_disabled+0x9b/0xc0 [bluetooth] load_conn_param+0x4bf/0x850 [bluetooth] hci_sock_sendmsg+0x96b/0xf80 [bluetooth]
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: 0ece498c27d8cd2fdad6f49a6abc34b8badd8fbc , < 65ce6fe1b92112ba9064ded932c03180da3dd230 (git)
Affected: 0ece498c27d8cd2fdad6f49a6abc34b8badd8fbc , < 57059ff14d81df4a970b2ea8d8f54431bb91a025 (git)
Affected: 0ece498c27d8cd2fdad6f49a6abc34b8badd8fbc , < b82802b5ab26a7c69fc2e7a0f2baa3c13a6c21aa (git)
Affected: 0ece498c27d8cd2fdad6f49a6abc34b8badd8fbc , < 2bf282f8f715f5d05d6f4c49ffb3bd241c5e667e (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.11
Unaffected: 0 , < 6.11 (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)
guessed Create a notification for this product.
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{
  "containers": {
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      "affected": [
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
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      "cpeApplicability": [
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                  "versionEndExcluding": "6.12.101",
                  "versionStartIncluding": "6.11",
                  "vulnerable": true
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: MGMT: revalidate LOAD_CONN_PARAM queued update\n\nMGMT_OP_LOAD_CONN_PARAM queues conn_update_sync() when a single parameter\nupdate changes an existing LE central connection. The queued work currently\nstores a borrowed hci_conn_params entry from hdev-\u003ele_conn_params. A later\nLOAD_CONN_PARAM request can clear disabled parameters and free that entry\nbefore hci_cmd_sync_work() runs the queued callback.\n\nDo not keep the borrowed hci_conn_params pointer in queued work. Queue the\nhci_conn instead and hold a reference until the queued callback completes.\nWhen the work runs, revalidate that the connection is still present, look\nup the current hci_conn_params entry, and cancel the update if userspace\nremoved that entry while the work was pending.\n\nCopy the interval values from the current params entry under hdev-\u003elock,\nthen drop the lock and keep using hci_le_conn_update_sync() to issue the\nupdate.\n\nValidation reproduced this kernel report:\nBUG: KASAN: slab-use-after-free in conn_update_sync+0x2a/0xf0 [bluetooth]\nRead of size 1 at addr ffff88810c697126 by task kworker/u17:0/377\nWorkqueue: hci0 hci_cmd_sync_work [bluetooth]\n\nCall Trace:\n \u003cTASK\u003e\n dump_stack_lvl+0x66/0xa0\n print_report+0xce/0x5f0\n kasan_report+0xe0/0x110\n conn_update_sync+0x2a/0xf0 [bluetooth]\n hci_cmd_sync_work+0x187/0x210 [bluetooth]\n process_one_work+0x4fd/0xbc0\n worker_thread+0x2d8/0x570\n kthread+0x1ad/0x1f0\n ret_from_fork+0x3c9/0x540\n ret_from_fork_asm+0x1a/0x30\n\nAllocated by task 466:\n hci_conn_params_add+0xa6/0x240 [bluetooth]\n load_conn_param+0x4e1/0x850 [bluetooth]\n hci_sock_sendmsg+0x96b/0xf80 [bluetooth]\n\nFreed by task 474:\n kfree+0x313/0x590\n hci_conn_params_clear_disabled+0x9b/0xc0 [bluetooth]\n load_conn_param+0x4bf/0x850 [bluetooth]\n hci_sock_sendmsg+0x96b/0xf80 [bluetooth]"
        }
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        {
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            "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 - The vulnerability is triggered entirely through local interfaces \u2014 two MGMT_OP_LOAD_CONN_PARAM commands written to a local AF_BLUETOOTH/BTPROTO_HCI socket bound to HCI_CHANNEL_CONTROL, reaching load_conn_param() via hci_sock_sendmsg()/hci_mgmt_cmd(). No over-the-air interaction from a remote Bluetooth peer is required.\nAC:L - The attacker controls both sides of the race: it issues the LOAD_CONN_PARAM that queues conn_update_sync() and then immediately issues a second LOAD_CONN_PARAM whose hci_conn_params_clear_disabled() frees the borrowed entry before hci_cmd_sync_work() dequeues it, and it can grool the slab by repeated hci_conn_params_add() calls.\nPR:L - Reaching load_conn_param() needs a trusted MGMT socket (CAP_NET_ADMIN at bind), which is exactly the privilege held by the unprivileged Bluetooth service account on Android and desktop Linux (bluetoothd / com.android.bluetooth) \u2014 a low-privilege, externally exposed daemon, not real root, and the standard scoring for MGMT-socket flaws.\nUI:N - Exploitation requires only that the attacker send its own MGMT commands over an existing LE central connection it can itself establish; no action by any other user or victim application is needed.\nS:U - The use-after-free corrupts kernel slab memory and its impact stays within the kernel\u0027s own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - This is a slab use-after-free read: conn_update_sync() reads addr/addr_type and the four interval fields from a freed hci_conn_params and places them into the HCI_OP_LE_CONN_UPDATE command, leaking reallocated heap contents; more generally a UAF gives the attacker control over freed-object contents and can be leveraged into arbitrary kernel memory disclosure.\nI:H - The attacker grooms the freed hci_conn_params slot with controlled data, so freed memory dictates which connection is looked up and what parameters are programmed into the controller; a use-after-free of this kind is a standard primitive for heap manipulation and control-flow/data corruption in the kernel.\nA:H - The bug is a confirmed KASAN slab-use-after-free (BUG: KASAN: slab-use-after-free in conn_update_sync+0x2a/0xf0) in a workqueue context, which panics on KASAN/panic_on_warn kernels and readily causes oopses or unpredictable Bluetooth-stack state otherwise."
            }
          ]
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        "dateUpdated": "2026-08-17T05:04:42.328Z",
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        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/65ce6fe1b92112ba9064ded932c03180da3dd230"
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          "url": "https://git.kernel.org/stable/c/2bf282f8f715f5d05d6f4c49ffb3bd241c5e667e"
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      ],
      "title": "Bluetooth: MGMT: revalidate LOAD_CONN_PARAM queued update",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-68394",
    "datePublished": "2026-08-10T12:04:13.562Z",
    "dateReserved": "2026-07-30T09:28:09.389Z",
    "dateUpdated": "2026-08-17T05:04:42.328Z",
    "state": "PUBLISHED"
  },
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      "date": "2026-09-11",
      "epss": "0.00125",
      "percentile": "0.02513"
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Queue the\\nhci_conn instead and hold a reference until the queued callback completes.\\nWhen the work runs, revalidate that the connection is still present, look\\nup the current hci_conn_params entry, and cancel the update if userspace\\nremoved that entry while the work was pending.\\n\\nCopy the interval values from the current params entry under hdev-\u003elock,\\nthen drop the lock and keep using hci_le_conn_update_sync() to issue the\\nupdate.\\n\\nValidation reproduced this kernel report:\\nBUG: KASAN: slab-use-after-free in conn_update_sync+0x2a/0xf0 [bluetooth]\\nRead of size 1 at addr ffff88810c697126 by task kworker/u17:0/377\\nWorkqueue: hci0 hci_cmd_sync_work [bluetooth]\\n\\nCall Trace:\\n \u003cTASK\u003e\\n dump_stack_lvl+0x66/0xa0\\n print_report+0xce/0x5f0\\n kasan_report+0xe0/0x110\\n conn_update_sync+0x2a/0xf0 [bluetooth]\\n hci_cmd_sync_work+0x187/0x210 [bluetooth]\\n process_one_work+0x4fd/0xbc0\\n worker_thread+0x2d8/0x570\\n kthread+0x1ad/0x1f0\\n ret_from_fork+0x3c9/0x540\\n ret_from_fork_asm+0x1a/0x30\\n\\nAllocated by task 466:\\n hci_conn_params_add+0xa6/0x240 [bluetooth]\\n load_conn_param+0x4e1/0x850 [bluetooth]\\n hci_sock_sendmsg+0x96b/0xf80 [bluetooth]\\n\\nFreed by task 474:\\n kfree+0x313/0x590\\n hci_conn_params_clear_disabled+0x9b/0xc0 [bluetooth]\\n load_conn_param+0x4bf/0x850 [bluetooth]\\n hci_sock_sendmsg+0x96b/0xf80 [bluetooth]\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/bluetooth/mgmt.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"0ece498c27d8cd2fdad6f49a6abc34b8badd8fbc\",\"lessThan\":\"65ce6fe1b92112ba9064ded932c03180da3dd230\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0ece498c27d8cd2fdad6f49a6abc34b8badd8fbc\",\"lessThan\":\"57059ff14d81df4a970b2ea8d8f54431bb91a025\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0ece498c27d8cd2fdad6f49a6abc34b8badd8fbc\",\"lessThan\":\"b82802b5ab26a7c69fc2e7a0f2baa3c13a6c21aa\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0ece498c27d8cd2fdad6f49a6abc34b8badd8fbc\",\"lessThan\":\"2bf282f8f715f5d05d6f4c49ffb3bd241c5e667e\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/bluetooth/mgmt.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.11\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.11\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.101\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.42\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.6\",\"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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2bf282f8f715f5d05d6f4c49ffb3bd241c5e667e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/57059ff14d81df4a970b2ea8d8f54431bb91a025\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/65ce6fe1b92112ba9064ded932c03180da3dd230\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b82802b5ab26a7c69fc2e7a0f2baa3c13a6c21aa\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-31T11:24:17+00:00",
      "cve": "CVE-2026-68394",
      "id": "CVE-2026-68394",
      "initial_release_date": "2026-08-10T00:00:00+00:00",
      "product_status:known_affected": "183",
      "product_status:known_not_affected": "94",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Bluetooth: MGMT: revalidate LOAD_CONN_PARAM queued update",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68394.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-08-13T16:22:32Z",
      "cve": "CVE-2026-68394",
      "id": "CVE-2026-68394",
      "initial_release_date": "2026-08-13T16:22:32Z",
      "product_status:known_not_affected": "296",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-68394",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68394.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.