GHSA-6GRR-36F8-J7PV

Vulnerability from github – Published: 2026-05-05 18:33 – Updated: 2026-05-05 18:33
VLAI?
Details

In the Linux kernel, the following vulnerability has been resolved:

serial: 8250: Fix TX deadlock when using DMA

dmaengine_terminate_async does not guarantee that the __dma_tx_complete callback will run. The callback is currently the only place where dma->tx_running gets cleared. If the transaction is canceled and the callback never runs, then dma->tx_running will never get cleared and we will never schedule new TX DMA transactions again.

This change makes it so we clear dma->tx_running after we terminate the DMA transaction. This is "safe" because serial8250_tx_dma_flush is holding the UART port lock. The first thing the callback does is also grab the UART port lock, so access to dma->tx_running is serialized.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-43061"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-05T16:16:15Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nserial: 8250: Fix TX deadlock when using DMA\n\n`dmaengine_terminate_async` does not guarantee that the\n`__dma_tx_complete` callback will run. The callback is currently the\nonly place where `dma-\u003etx_running` gets cleared. If the transaction is\ncanceled and the callback never runs, then `dma-\u003etx_running` will never\nget cleared and we will never schedule new TX DMA transactions again.\n\nThis change makes it so we clear `dma-\u003etx_running` after we terminate\nthe DMA transaction. This is \"safe\" because `serial8250_tx_dma_flush`\nis holding the UART port lock. The first thing the callback does is also\ngrab the UART port lock, so access to `dma-\u003etx_running` is serialized.",
  "id": "GHSA-6grr-36f8-j7pv",
  "modified": "2026-05-05T18:33:25Z",
  "published": "2026-05-05T18:33:24Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43061"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2a72403b985aea6b4aac3171830492f9a387f9e1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5f6b17562f03fc65c7d3474ef8f1959b19d1ca41"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/79a19bd936bb35f56ef0ccab1b3b59ebce8c762d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8190f9ab6ad90cb97652adbebd238b874a4ef70d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a424a34b8faddf97b5af41689087e7a230f79ba7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b5ad887339503103d0fbe9827b16ad287597c275"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d2719a0a9c3439abf67843a5504b7afccd9ded93"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f76d91271bcacbd759a2e4ee3ea61faa6a727ccf"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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