CVE-2026-74654 (GCVE-0-2026-74654)

Vulnerability from cvelistv5 – Published: 2026-08-22 15:32 – Updated: 2026-08-22 15:32
VLAI
Title
serial: 8250_dma: Clear stale RX state on shutdown
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 0fcb7901f9d61a325b4c5b88c600383bcbeb97fe , < bf4fb620e02962b2b52500a4b3d8420f351eb46a (git)
Affected: 0fcb7901f9d61a325b4c5b88c600383bcbeb97fe , < e10f06ee050a08930e2339b6fec7148fd0b2a8f6 (git)
Affected: 0fcb7901f9d61a325b4c5b88c600383bcbeb97fe , < d06cfb1add4a2d5b393e9e31f49ebbd168beea49 (git)
Affected: 0fcb7901f9d61a325b4c5b88c600383bcbeb97fe , < e7a5d792cf64a2096e18f1d573cc3d01cba15e92 (git)
Affected: 0fcb7901f9d61a325b4c5b88c600383bcbeb97fe , < 9f2444f4c0e4b06f61bae38da87c9c94c78efa86 (git)
Affected: 0fcb7901f9d61a325b4c5b88c600383bcbeb97fe , < ae05d9e50b6b9f246c110b3bdc03676145c2d0d4 (git)
Affected: 0fcb7901f9d61a325b4c5b88c600383bcbeb97fe , < e7e3cc6709caa49d1d6ce6c1f7cb305e38675cc9 (git)
Affected: 0fcb7901f9d61a325b4c5b88c600383bcbeb97fe , < e2fe6a0efecbef00e3ecc2db64dd5afa8c212b41 (git)
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Linux Linux Affected: 3.19
Unaffected: 0 , < 3.19 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.152 , ≤ 6.6.* (semver)
Unaffected: 6.12.104 , ≤ 6.12.* (semver)
Unaffected: 6.18.45 , ≤ 6.18.* (semver)
Unaffected: 7.1.9 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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              "status": "unaffected",
              "version": "6.18.45",
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              "status": "unaffected",
              "version": "7.1.9",
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              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
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        }
      ],
      "cpeApplicability": [
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                  "versionEndExcluding": "5.10.265",
                  "versionStartIncluding": "3.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.216",
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                  "vulnerable": true
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      "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"
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          "url": "https://git.kernel.org/stable/c/e10f06ee050a08930e2339b6fec7148fd0b2a8f6"
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        {
          "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"
  },
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  "dataVersion": "5.2",
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      "date": "2026-08-29",
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      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "serial: 8250_dma: Clear stale RX state on shutdown",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74654.json",
      "version": "2"
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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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/tty/serial/8250/8250_dma.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"0fcb7901f9d61a325b4c5b88c600383bcbeb97fe\",\"lessThan\":\"bf4fb620e02962b2b52500a4b3d8420f351eb46a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0fcb7901f9d61a325b4c5b88c600383bcbeb97fe\",\"lessThan\":\"e10f06ee050a08930e2339b6fec7148fd0b2a8f6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0fcb7901f9d61a325b4c5b88c600383bcbeb97fe\",\"lessThan\":\"d06cfb1add4a2d5b393e9e31f49ebbd168beea49\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0fcb7901f9d61a325b4c5b88c600383bcbeb97fe\",\"lessThan\":\"e7a5d792cf64a2096e18f1d573cc3d01cba15e92\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0fcb7901f9d61a325b4c5b88c600383bcbeb97fe\",\"lessThan\":\"9f2444f4c0e4b06f61bae38da87c9c94c78efa86\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0fcb7901f9d61a325b4c5b88c600383bcbeb97fe\",\"lessThan\":\"ae05d9e50b6b9f246c110b3bdc03676145c2d0d4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0fcb7901f9d61a325b4c5b88c600383bcbeb97fe\",\"lessThan\":\"e7e3cc6709caa49d1d6ce6c1f7cb305e38675cc9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0fcb7901f9d61a325b4c5b88c600383bcbeb97fe\",\"lessThan\":\"e2fe6a0efecbef00e3ecc2db64dd5afa8c212b41\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/tty/serial/8250/8250_dma.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.19\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.19\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.265\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.216\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.183\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.152\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.104\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.45\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.9\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/9f2444f4c0e4b06f61bae38da87c9c94c78efa86\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ae05d9e50b6b9f246c110b3bdc03676145c2d0d4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bf4fb620e02962b2b52500a4b3d8420f351eb46a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d06cfb1add4a2d5b393e9e31f49ebbd168beea49\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e10f06ee050a08930e2339b6fec7148fd0b2a8f6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e2fe6a0efecbef00e3ecc2db64dd5afa8c212b41\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e7a5d792cf64a2096e18f1d573cc3d01cba15e92\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e7e3cc6709caa49d1d6ce6c1f7cb305e38675cc9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-08-25T10:02:44+00:00",
      "cve": "CVE-2026-74654",
      "id": "CVE-2026-74654",
      "initial_release_date": "2026-08-22T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: serial: 8250_dma: Clear stale RX state on shutdown",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74654.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.