{
  "cveId": "CVE-2026-64409",
  "url": "https://patchblox.com/security/cve/CVE-2026-64409",
  "summary": "CVE-2026-64409 is fixed in 17 products on 1 platform, first by DEBIAN-CVE-2026-64409, released July 26, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "Bluetooth: btmtksdio: fix infinite loop in btmtksdio_txrx_work()",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  Bluetooth: btmtksdio: fix infinite loop in btmtksdio_txrx_work()  Every once in a while we see a hung btmtksdio_flush() task:   INFO: task kworker/u17:0:189 blocked for more than 122 seconds.  __cancel_work_timer\u002B0x3f4/0x460  cancel_work_sync\u002B0x1c/0x2c  btmtksdio_flush\u002B0x2c/0x40  hci_dev_open_sync\u002B0x10c4/0x2190  [..]  It all boils down to incorrect time_is_before_jiffies() usage in btmtksdio_txrx_work().  The btmtksdio_txrx_work() loop is expected to be terminated if running for longer than 5*HZ.  However the timeout check is twisted:  time_is_before_jiffies(old_jiffies \u002B 5*HZ) evaluates to true when old_jiffies \u002B 5*HZ is in the past i.e. when a timeout has occurred.  Using OR with time_is_before_jiffies(txrx_timeout) means that: - before the 5-second timeout: the condition is \u0060int_status || false\u0060,   so it loops as long as there are pending interrupts. - after the 5-second timeout: the condition becomes \u0060int_status || true\u0060,   which is always true.  When the loop becomes infinite btmtksdio_txrx_work() loop never terminates and never releases the SDIO host.  Fix loop termination condition to actually enforce a 5*HZ timeout.",
  "published": "2026-07-25T10:17:24Z",
  "severity": "Moderate",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00123,
  "epssPercentile": 0.02052,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-64409",
  "fixes": [
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      "fix": "OPENSUSE-SU-2026:21910-1",
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      "released": "2026-09-22T15:26:20Z"
    },
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      "product": "kernel-64kb",
      "release": "opensuse-leap 16.0",
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      "fix": "OPENSUSE-SU-2026:21910-1",
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      "released": "2026-09-22T15:26:20Z"
    },
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      "fix": "SUSE-SU-2026:4254-1",
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      "released": "2026-10-07T22:31:36Z"
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  "dataAsOf": "2026-11-08T00:53:09Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
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    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
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}