CVE-2026-43061 (GCVE-0-2026-43061)

Vulnerability from cvelistv5 – Published: 2026-05-05 15:17 – Updated: 2026-05-05 15:17
VLAI?
Title
serial: 8250: Fix TX deadlock when using DMA
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 7c47e637dfadfbc691dd297b91d81ef939ca2080 , < 8190f9ab6ad90cb97652adbebd238b874a4ef70d (git)
Affected: bf3f395b9c37956eca866c9e1679769ed7dcce68 , < 79a19bd936bb35f56ef0ccab1b3b59ebce8c762d (git)
Affected: d470522c597b73e63cca04f3012aec28185113b7 , < f76d91271bcacbd759a2e4ee3ea61faa6a727ccf (git)
Affected: 5e00346deb7bf40a4cf70e3716ac8e9a2409eb55 , < d2719a0a9c3439abf67843a5504b7afccd9ded93 (git)
Affected: c8a52c772c7c6de72257a435bcad03d3bb914a70 , < 2a72403b985aea6b4aac3171830492f9a387f9e1 (git)
Affected: 9e512eaaf8f4008c44ede3dfc0fbc9d9c5118583 , < 5f6b17562f03fc65c7d3474ef8f1959b19d1ca41 (git)
Affected: 9e512eaaf8f4008c44ede3dfc0fbc9d9c5118583 , < b5ad887339503103d0fbe9827b16ad287597c275 (git)
Affected: 9e512eaaf8f4008c44ede3dfc0fbc9d9c5118583 , < a424a34b8faddf97b5af41689087e7a230f79ba7 (git)
Affected: bbec5998d7bd349730f59c959a8b00cfff816e34 (git)
Affected: 59f751db7f392fa7a58cbd972205982f7f4f5854 (git)
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    Linux Linux Affected: 6.14
Unaffected: 0 , < 6.14 (semver)
Unaffected: 5.10.253 , ≤ 5.10.* (semver)
Unaffected: 5.15.203 , ≤ 5.15.* (semver)
Unaffected: 6.1.167 , ≤ 6.1.* (semver)
Unaffected: 6.6.130 , ≤ 6.6.* (semver)
Unaffected: 6.12.78 , ≤ 6.12.* (semver)
Unaffected: 6.18.20 , ≤ 6.18.* (semver)
Unaffected: 6.19.10 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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{
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          "programFiles": [
            "drivers/tty/serial/8250/8250_dma.c"
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          "vendor": "Linux",
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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": {
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/8190f9ab6ad90cb97652adbebd238b874a4ef70d"
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        },
        {
          "url": "https://git.kernel.org/stable/c/a424a34b8faddf97b5af41689087e7a230f79ba7"
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      ],
      "title": "serial: 8250: Fix TX deadlock when using DMA",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43061",
    "datePublished": "2026-05-05T15:17:27.079Z",
    "dateReserved": "2026-05-01T14:12:55.981Z",
    "dateUpdated": "2026-05-05T15:17:27.079Z",
    "state": "PUBLISHED"
  },
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      "date": "2026-05-10",
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  }
}


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