CVE-2026-74654 (GCVE-0-2026-74654)
Vulnerability from cvelistv5
Published
2026-08-22 15:32
Modified
2026-08-22 15:32
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: serial: 8250_dma: Clear stale RX state on shutdown serial8250_release_dma() terminates RX DMA and releases the channel, but leaves rx_running set. If the port is closed while an RX transfer is active, the stale state remains while rxchan is NULL until the channel is requested again on the next open. The DesignWare BUSY workaround added by commit a7b9ce39fbe4 ("serial: 8250_dw: Ensure BUSY is deasserted") calls serial8250_rx_dma_flush() from the LCR write path during startup. This happens before serial8250_request_dma() obtains a new RX channel. On reopen, the stale rx_running state therefore makes the flush path pass a NULL channel to dmaengine_pause(), causing a kernel Oops. Clear rx_running after terminating RX DMA, matching the TX cleanup. Also make the flush helper return if the DMA object or RX channel is not available so startup and teardown paths cannot pass a NULL channel to the DMAengine API.
References
Impacted products
Vendor Product Version
Linux Linux Version: 0fcb7901f9d61a325b4c5b88c600383bcbeb97fe
Version: 0fcb7901f9d61a325b4c5b88c600383bcbeb97fe
Version: 0fcb7901f9d61a325b4c5b88c600383bcbeb97fe
Version: 0fcb7901f9d61a325b4c5b88c600383bcbeb97fe
Version: 0fcb7901f9d61a325b4c5b88c600383bcbeb97fe
Version: 0fcb7901f9d61a325b4c5b88c600383bcbeb97fe
Version: 0fcb7901f9d61a325b4c5b88c600383bcbeb97fe
Version: 0fcb7901f9d61a325b4c5b88c600383bcbeb97fe
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/tty/serial/8250/8250_dma.c"
          ],
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          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.19"
            },
            {
              "lessThan": "3.19",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.265",
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            },
            {
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              "status": "unaffected",
              "version": "5.15.216",
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            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.183",
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            },
            {
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              "status": "unaffected",
              "version": "6.6.152",
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            },
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              "status": "unaffected",
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              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
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                {
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                  "versionEndExcluding": "7.2",
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                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nserial: 8250_dma: Clear stale RX state on shutdown\n\nserial8250_release_dma() terminates RX DMA and releases the channel, but\nleaves rx_running set.  If the port is closed while an RX transfer is\nactive, the stale state remains while rxchan is NULL until the channel is\nrequested again on the next open.\n\nThe DesignWare BUSY workaround added by commit a7b9ce39fbe4\n(\"serial: 8250_dw: Ensure BUSY is deasserted\") calls\nserial8250_rx_dma_flush() from the LCR write path during startup.  This\nhappens before serial8250_request_dma() obtains a new RX channel.  On\nreopen, the stale rx_running state therefore makes the flush path pass a\nNULL channel to dmaengine_pause(), causing a kernel Oops.\n\nClear rx_running after terminating RX DMA, matching the TX cleanup.  Also\nmake the flush helper return if the DMA object or RX channel is not\navailable so startup and teardown paths cannot pass a NULL channel to the\nDMAengine API."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-22T15:32:29.263Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/bf4fb620e02962b2b52500a4b3d8420f351eb46a"
        },
        {
          "url": "https://git.kernel.org/stable/c/e10f06ee050a08930e2339b6fec7148fd0b2a8f6"
        },
        {
          "url": "https://git.kernel.org/stable/c/d06cfb1add4a2d5b393e9e31f49ebbd168beea49"
        },
        {
          "url": "https://git.kernel.org/stable/c/e7a5d792cf64a2096e18f1d573cc3d01cba15e92"
        },
        {
          "url": "https://git.kernel.org/stable/c/9f2444f4c0e4b06f61bae38da87c9c94c78efa86"
        },
        {
          "url": "https://git.kernel.org/stable/c/ae05d9e50b6b9f246c110b3bdc03676145c2d0d4"
        },
        {
          "url": "https://git.kernel.org/stable/c/e7e3cc6709caa49d1d6ce6c1f7cb305e38675cc9"
        },
        {
          "url": "https://git.kernel.org/stable/c/e2fe6a0efecbef00e3ecc2db64dd5afa8c212b41"
        }
      ],
      "title": "serial: 8250_dma: Clear stale RX state on shutdown",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74654",
    "datePublished": "2026-08-22T15:32:29.263Z",
    "dateReserved": "2026-08-15T05:44:03.923Z",
    "dateUpdated": "2026-08-22T15:32:29.263Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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