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

Vulnerability from cvelistv5 – Published: 2026-05-05 15:17 – Updated: 2026-05-23 16:06
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
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
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)
Affected: 5.10.235 , < 5.10.253 (semver)
Affected: 5.15.179 , < 5.15.203 (semver)
Affected: 6.1.129 , < 6.1.167 (semver)
Affected: 6.6.79 , < 6.6.130 (semver)
Affected: 6.12.16 , < 6.12.78 (semver)
Affected: 5.4.291 , < 5.5 (semver)
Affected: 6.13.4 , < 6.14 (semver)
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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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                "negate": false,
                "operator": "OR"
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            ]
          }
        ],
        "cveTags": [],
        "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."
          }
        ],
        "id": "CVE-2026-43061",
        "lastModified": "2026-06-17T10:48:51.583",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 5.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ]
        },
        "published": "2026-05-05T16:16:15.210",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
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            "url": "https://git.kernel.org/stable/c/2a72403b985aea6b4aac3171830492f9a387f9e1"
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-667"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-28T07:34:59+00:00",
      "cve": "CVE-2026-43061",
      "id": "CVE-2026-43061",
      "initial_release_date": "2026-05-05T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: serial: 8250: Fix TX deadlock when using DMA",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43061.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-31T17:10:35Z",
      "cve": "CVE-2026-43061",
      "id": "CVE-2026-43061",
      "initial_release_date": "2026-05-06T01:40:43Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "424",
      "product_status:known_not_affected": "294",
      "product_status:recommended": "250",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-43061",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-43061.json",
      "version": "9"
    }
  }
}



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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.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • 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.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.