tty: serial: fsl_lpuart: disable dma rx/tx use flags in lpuart_dma_shutdown

{
  "id": "d290c56e8b33ad48c7f83f15fa79a843b98f23d2a29f613411d3099596275b59",
  "url": "https://osv.dev/vulnerability/CVE-2022-50375",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "tty: serial: fsl_lpuart: disable dma rx/tx use flags in lpuart_dma_shutdown",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: tty: serial: fsl_lpuart: disable dma rx/tx use flags in lpuart_dma_shutdown lpuart_dma_shutdown tears down lpuart dma, but lpuart_flush_buffer can still occur which in turn tries to access dma apis if lpuart_dma_tx_use flag is true. At this point since dma is torn down, these dma apis can abort. Set lpuart_dma_tx_use and the corresponding rx flag lpuart_dma_rx_use to false in lpuart_dma_shutdown so that dmas are not accessed after they are relinquished. Otherwise, when try to kill btattach, kernel may panic. This patch may fix this issue. root@imx8ulpevk:~# btattach -B /dev/ttyLP2 -S 115200 ^C[ 90.182296] Internal error: synchronous external abort: 96000210 [#1] PREEMPT SMP [ 90.189806] Modules linked in: moal(O) mlan(O) [ 90.194258] CPU: 0 PID: 503 Comm: btattach Tainted: G O 5.15.32-06136-g34eecdf2f9e4 #37 [ 90.203554] Hardware name: NXP i.MX8ULP 9X9 EVK (DT) [ 90.208513] pstate: 600000c5 (nZCv daIF -PAN -UAO -TCO -DIT -SSBS BTYPE=--) [ 90.215470] pc : fsl_edma3_disable_request+0x8/0x60 [ 90.220358] lr : fsl_edma3_terminate_all+0x34/0x20c [ 90.225237] sp : ffff800013f0bac0 [ 90.228548] x29: ffff800013f0bac0 x28: 0000000000000001 x27: ffff000008404800 [ 90.235681] x26: ffff000008404960 x25: ffff000008404a08 x24: ffff000008404a00 [ 90.242813] x23: ffff000008404a60 x22: 0000000000000002 x21: 0000000000000000 [ 90.249946] x20: ffff800013f0baf8 x19: ffff00000559c800 x18: 0000000000000000 [ 90.257078] x17: 000000",
    "evidence": "osv:CVE-2022-50375",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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            "evidence": "/affected/1/ranges"
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            "value": "5.10.150",
            "evidence": "/affected/1/ranges"
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          {
            "value": "5.15.75",
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          {
            "value": "5.19.17",
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          {
            "value": "6.0.3",
            "evidence": "/affected/1/ranges"
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        "affected_versions": []
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    ],
    "severity": "medium",
    "structured": {
      "id": "CVE-2022-50375",
      "aliases": [
        "CVE-2022-50375"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
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          "package": {
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            "ecosystem": "Linux"
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      ],
      "modified": "2026-10-28T02:30:32.461264782Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/29b897ac7b990882c74bd08605692214e7e58b83",
        "https://git.kernel.org/stable/c/316ae95c175a7d770d1bfe4c011192712f57aa4a",
        "https://git.kernel.org/stable/c/3953e7f261e2f4d9c35f0c025df9f166f46aa626",
        "https://git.kernel.org/stable/c/9a56ade124d4891a31ab1300c57665f07f5b24d5",
        "https://git.kernel.org/stable/c/c4293def8860fd587a84400ccba5b49cec56e2c3",
        "https://git.kernel.org/stable/c/d554c14eb73ee91d76fc9aece4616f0b687c295d",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50375.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2022-50375",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
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      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50375.json"
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        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
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  "source_id": "core-osv",
  "document_id": 499312,
  "published_at": "2025-09-18T13:32:58.361+00:00"
}