CVE-2026-43061 (GCVE-0-2026-43061)
Vulnerability from cvelistv5
Published
2026-05-05 15:17
Modified
2026-05-23 16:06
Severity ?
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 7c47e637dfadfbc691dd297b91d81ef939ca2080
Version: bf3f395b9c37956eca866c9e1679769ed7dcce68
Version: d470522c597b73e63cca04f3012aec28185113b7
Version: 5e00346deb7bf40a4cf70e3716ac8e9a2409eb55
Version: c8a52c772c7c6de72257a435bcad03d3bb914a70
Version: 9e512eaaf8f4008c44ede3dfc0fbc9d9c5118583
Version: 9e512eaaf8f4008c44ede3dfc0fbc9d9c5118583
Version: 9e512eaaf8f4008c44ede3dfc0fbc9d9c5118583
Version: bbec5998d7bd349730f59c959a8b00cfff816e34
Version: 59f751db7f392fa7a58cbd972205982f7f4f5854
Version: 5.10.235   ≤
Version: 5.15.179   ≤
Version: 6.1.129   ≤
Version: 6.6.79   ≤
Version: 6.12.16   ≤
Version: 5.4.291   ≤
Version: 6.13.4   ≤
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      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-23T16:06:10.956Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/8190f9ab6ad90cb97652adbebd238b874a4ef70d"
        },
        {
          "url": "https://git.kernel.org/stable/c/79a19bd936bb35f56ef0ccab1b3b59ebce8c762d"
        },
        {
          "url": "https://git.kernel.org/stable/c/f76d91271bcacbd759a2e4ee3ea61faa6a727ccf"
        },
        {
          "url": "https://git.kernel.org/stable/c/d2719a0a9c3439abf67843a5504b7afccd9ded93"
        },
        {
          "url": "https://git.kernel.org/stable/c/2a72403b985aea6b4aac3171830492f9a387f9e1"
        },
        {
          "url": "https://git.kernel.org/stable/c/5f6b17562f03fc65c7d3474ef8f1959b19d1ca41"
        },
        {
          "url": "https://git.kernel.org/stable/c/b5ad887339503103d0fbe9827b16ad287597c275"
        },
        {
          "url": "https://git.kernel.org/stable/c/a424a34b8faddf97b5af41689087e7a230f79ba7"
        }
      ],
      "title": "serial: 8250: Fix TX deadlock when using DMA",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43061",
    "datePublished": "2026-05-05T15:17:27.079Z",
    "dateReserved": "2026-05-01T14:12:55.981Z",
    "dateUpdated": "2026-05-23T16:06:10.956Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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