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CVE-2026-68389 (GCVE-0-2026-68389)

Vulnerability from cvelistv5 – Published: 2026-08-10 12:04 – Updated: 2026-08-17 05:04
VLAI
Title
Bluetooth: hci_qca: Clear memdump state on invalid dump size
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_qca: Clear memdump state on invalid dump size qca_controller_memdump() allocates qca->qca_memdump before processing the first dump packet. For a sequence-zero packet it then disables IBS, marks memdump collection active, and reads the advertised dump size. If the controller reports a zero dump size, the error path frees the local qca_memdump object and returns without clearing qca->qca_memdump or undoing the collection state. A later memdump work item initializes its local pointer from qca->qca_memdump and skips allocation when that pointer is non-NULL, so it can operate on freed memory. The stale collection and IBS-disabled flags can also leave waiters or later transmit handling blocked behind an aborted dump. Clear the saved pointer and memdump state before returning from the invalid-size path, matching the cleanup used when hci_devcd_init() fails. A static analysis checker reported the stale memdump state, and manual source review confirmed the invalid-size failure path.
Severity
8.8 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 06d3fdfcdf5cefb06f2024b9d3dad356779399cf , < 5a3945e8dea6c9a8ec9e981169ac9487e1d6ad6a (git)
Affected: 06d3fdfcdf5cefb06f2024b9d3dad356779399cf , < 069258d5111eed9ac9586bee42d03d38e2975715 (git)
Affected: 06d3fdfcdf5cefb06f2024b9d3dad356779399cf , < cefb44c367b2b52e50f97bc8526d39df9bcf5e60 (git)
Affected: 06d3fdfcdf5cefb06f2024b9d3dad356779399cf , < 2363a757694752426fc47f3eadde15cf5f791fa5 (git)
Affected: 06d3fdfcdf5cefb06f2024b9d3dad356779399cf , < bf587a10c33e5571a299742e45bc18960b9912e7 (git)
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Linux Linux Affected: 6.6
Unaffected: 0 , < 6.6 (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": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_qca: Clear memdump state on invalid dump size\n\nqca_controller_memdump() allocates qca-\u003eqca_memdump before processing\nthe first dump packet. For a sequence-zero packet it then disables IBS,\nmarks memdump collection active, and reads the advertised dump size.\n\nIf the controller reports a zero dump size, the error path frees the\nlocal qca_memdump object and returns without clearing qca-\u003eqca_memdump\nor undoing the collection state. A later memdump work item initializes\nits local pointer from qca-\u003eqca_memdump and skips allocation when that\npointer is non-NULL, so it can operate on freed memory. The stale\ncollection and IBS-disabled flags can also leave waiters or later\ntransmit handling blocked behind an aborted dump.\n\nClear the saved pointer and memdump state before returning from the\ninvalid-size path, matching the cleanup used when hci_devcd_init() fails.\n\nA static analysis checker reported the stale memdump state, and manual\nsource review confirmed the invalid-size failure path."
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            "version": "3.1"
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              "value": "AV:A - The vulnerable memdump packets arrive as QCA vendor HCI events (QCA_SSR_DUMP_HANDLE) emitted by the Bluetooth controller after a firmware crash/SSR, a state a nearby attacker induces or controls by attacking QCA controller firmware over the radio link, matching the CNA convention of scoring controller-event-driven Bluetooth driver bugs as Adjacent.\nAC:L - An attacker controlling the controller-to-host HCI stream deterministically triggers the flaw by sending a sequence-0 memdump packet with dump_size 0 followed by any further memdump packet; there is no race and no attacker-uncontrollable timing or memory-layout precondition.\nPR:N - No host credentials or authentication are needed: the memdump event is consumed unconditionally by qca_recv_event() on the driver receive path with no pairing, bonding, or capability check before qca_controller_memdump() runs.\nUI:N - SSR/memdump handling is fully automatic \u2014 qca_controller_memdump_event() queues the work item on receipt, so no local user has to open, mount, or confirm anything.\nS:U - The dangling pointer, use-after-free writes, and double free all occur in the host kernel\u0027s own heap and authority; no VM escape, IOMMU bypass, or sandbox boundary is crossed.\nC:H - The stale qca-\u003eqca_memdump gives a use-after-free on a kmalloc-16 object that an attacker can reclaim with another kernel allocation, and the freed fields (received_dump/ram_dump_size) then drive hci_devcd_append() length arithmetic, yielding attacker-influenced kernel memory disclosure per UAF exploitation.\nI:H - The reused freed object receives attacker-supplied 32-bit values (ram_dump_size straight from the packet, plus current_seq_no/received_dump) and is later kfree()d again, providing a controlled heap write and double-free primitive usable for arbitrary write and control-flow hijack.\nA:H - Beyond the use-after-free/double-free oops (KASAN slab-use-after-free), the uncleared QCA_MEMDUMP_COLLECTION and QCA_IBS_DISABLED flags leave wait_on_bit_timeout() waiters and the IBS transmit path stalled behind an aborted dump, persistently wedging the Bluetooth device."
            }
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      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:04:36.839Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-68389",
    "datePublished": "2026-08-10T12:04:08.306Z",
    "dateReserved": "2026-07-30T09:28:09.388Z",
    "dateUpdated": "2026-08-17T05:04:36.839Z",
    "state": "PUBLISHED"
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    },
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-31T11:24:08+00:00",
      "cve": "CVE-2026-68389",
      "id": "CVE-2026-68389",
      "initial_release_date": "2026-08-10T00:00:00+00:00",
      "product_status:known_not_affected": "277",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Bluetooth: hci_qca: Clear memdump state on invalid dump size",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68389.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-08-13T16:22:42Z",
      "cve": "CVE-2026-68389",
      "id": "CVE-2026-68389",
      "initial_release_date": "2026-08-13T16:22:42Z",
      "product_status:known_not_affected": "296",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-68389",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68389.json",
      "version": "2"
    }
  }
}



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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.
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