CVE-2026-68189 (GCVE-0-2026-68189)
Vulnerability from cvelistv5
Published
2026-08-10 12:00
Modified
2026-08-19 16:31
Severity ?
7.8 (High) - CVSS:3.1/AV:L/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_sync: Protect UUID list traversal The hci_sync conversion moved class-of-device and EIR generation from an HCI request built under hdev->lock to asynchronous command sync work. The worker holds hdev->req_lock, but that lock does not serialize access to hdev->uuids against add_uuid() and remove_uuid(), which update the list under hdev->lock. The following interleaving can therefore occur: CPU0 (command sync work) CPU1 (management socket) fetch uuid from the list list_del(&uuid->list) kfree(uuid) read uuid->size KASAN reports the resulting use-after-free: BUG: KASAN: slab-use-after-free in eir_create+0xb8f/0xee0 Read of size 1 at addr ffff88810dbd8620 by task kworker/u17:0/87 Workqueue: hci0 hci_cmd_sync_work Call Trace: eir_create+0xb8f/0xee0 hci_update_eir_sync+0x1c0/0x330 hci_cmd_sync_work+0x13c/0x290 process_one_work+0x63a/0x1070 worker_thread+0x45b/0xd10 Allocated by task 86: __kasan_kmalloc+0x8f/0xa0 add_uuid+0x18a/0x4b0 hci_sock_sendmsg+0x1033/0x1ea0 Freed by task 92: __kasan_slab_free+0x43/0x70 kfree+0x131/0x3c0 remove_uuid+0x25e/0x560 hci_sock_sendmsg+0x1033/0x1ea0 Hold hdev->lock while generating and committing the class-of-device and EIR snapshots. Release it before sending an HCI command, so controller waits do not happen under the device lock. This protects all UUID list walks in these paths and restores the serialization lost in the command sync conversion.
References
Impacted products
Vendor Product Version
Linux Linux Version: 161510ccf91c961638940b03abb1ee804be53a97
Version: 161510ccf91c961638940b03abb1ee804be53a97
Version: 161510ccf91c961638940b03abb1ee804be53a97
Version: 161510ccf91c961638940b03abb1ee804be53a97
Version: 161510ccf91c961638940b03abb1ee804be53a97
Version: 161510ccf91c961638940b03abb1ee804be53a97
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/hci_sync.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "30bc6248f035a792d1b1f4cc761b32fd5827b55f",
              "status": "affected",
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            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/hci_sync.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.17"
            },
            {
              "lessThan": "5.17",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.183",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.148",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.101",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.42",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.6",
              "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": "6.1.183",
                  "versionStartIncluding": "5.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.148",
                  "versionStartIncluding": "5.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.101",
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                  "vulnerable": true
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.42",
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.6",
                  "versionStartIncluding": "5.17",
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                {
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                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "5.17",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sync: Protect UUID list traversal\n\nThe hci_sync conversion moved class-of-device and EIR generation from an\nHCI request built under hdev-\u003elock to asynchronous command sync work.\nThe worker holds hdev-\u003ereq_lock, but that lock does not serialize access\nto hdev-\u003euuids against add_uuid() and remove_uuid(), which update the\nlist under hdev-\u003elock.\n\nThe following interleaving can therefore occur:\n\n  CPU0 (command sync work)       CPU1 (management socket)\n  fetch uuid from the list\n                                list_del(\u0026uuid-\u003elist)\n                                kfree(uuid)\n  read uuid-\u003esize\n\nKASAN reports the resulting use-after-free:\n\n  BUG: KASAN: slab-use-after-free in eir_create+0xb8f/0xee0\n  Read of size 1 at addr ffff88810dbd8620 by task kworker/u17:0/87\n  Workqueue: hci0 hci_cmd_sync_work\n  Call Trace:\n   eir_create+0xb8f/0xee0\n   hci_update_eir_sync+0x1c0/0x330\n   hci_cmd_sync_work+0x13c/0x290\n   process_one_work+0x63a/0x1070\n   worker_thread+0x45b/0xd10\n\n  Allocated by task 86:\n   __kasan_kmalloc+0x8f/0xa0\n   add_uuid+0x18a/0x4b0\n   hci_sock_sendmsg+0x1033/0x1ea0\n\n  Freed by task 92:\n   __kasan_slab_free+0x43/0x70\n   kfree+0x131/0x3c0\n   remove_uuid+0x25e/0x560\n   hci_sock_sendmsg+0x1033/0x1ea0\n\nHold hdev-\u003elock while generating and committing the class-of-device and\nEIR snapshots.  Release it before sending an HCI command, so controller\nwaits do not happen under the device lock.  This protects all UUID list\nwalks in these paths and restores the serialization lost in the command\nsync conversion."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "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 - Exploitation requires concurrent MGMT_OP_ADD_UUID/MGMT_REMOVE_UUID commands through a local AF_BLUETOOTH HCI management socket (hci_sock_sendmsg), not reception of over-the-air Bluetooth protocol traffic from a remote peer.\nAC:L - The attacker controls both sides of the race by issuing concurrent management socket commands from threads or processes they own; KASAN shows reliable interleaving between hci_cmd_sync_work and remove_uuid without attacker-uncontrollable timing or memory layout.\nPR:L - MGMT_OP_ADD_UUID and MGMT_OP_REMOVE_UUID require HCI_SOCK_TRUSTED, set only when the socket binder holds CAP_NET_ADMIN; per kernel CNA guidance CAP_NET_ADMIN reachable via user namespaces (unshare -Urn) maps to PR:L, not PR:H.\nUI:N - No victim interaction is required; the attacker directly issues local management commands that queue hci_cmd_sync_work and concurrently modify the UUID list to trigger the use-after-free.\nS:U - The vulnerability causes kernel heap corruption and local privilege escalation within the same host security authority; it does not cross VM, container, or IOMMU security boundaries.\nC:H - KASAN-confirmed slab use-after-free reading freed bt_uuid fields (uuid-\u003esize and uuid data) during eir_create traversal enables arbitrary kernel memory disclosure via heap spraying and reuse of freed kmalloc objects.\nI:H - Slab UAF on bt_uuid during list traversal enables attacker-controlled reallocation of freed objects, providing heap corruption primitives that can be leveraged for arbitrary kernel writes and control-flow hijacking.\nA:H - The confirmed use-after-free in eir_create on the hci_cmd_sync_work path causes kernel oops or panic; repeated concurrent add/remove UUID operations can reliably crash or hang the system."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-19T16:31:01.944Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/30bc6248f035a792d1b1f4cc761b32fd5827b55f"
        },
        {
          "url": "https://git.kernel.org/stable/c/e4fa2c5c261d736b8e58759fdef3a968d510630c"
        },
        {
          "url": "https://git.kernel.org/stable/c/a351f68fb24828b23a971e00b8238ee0e8a40380"
        },
        {
          "url": "https://git.kernel.org/stable/c/a42f5536ea9c00e13f0c0fbb330feed95e2365ca"
        },
        {
          "url": "https://git.kernel.org/stable/c/fe13adc258df88d95789e5673c7ba5178b5f8b28"
        },
        {
          "url": "https://git.kernel.org/stable/c/e9027ffbf5a0f3c12ca8900822e884eae9f0821b"
        }
      ],
      "title": "Bluetooth: hci_sync: Protect UUID list traversal",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-68189",
    "datePublished": "2026-08-10T12:00:01.711Z",
    "dateReserved": "2026-07-30T09:28:09.373Z",
    "dateUpdated": "2026-08-19T16:31:01.944Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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