CVE-2026-43427 (GCVE-0-2026-43427)

Vulnerability from cvelistv5 – Published: 2026-05-08 14:22 – Updated: 2026-05-11 22:24
VLAI
Title
usb: class: cdc-wdm: fix reordering issue in read code path
Summary
In the Linux kernel, the following vulnerability has been resolved: usb: class: cdc-wdm: fix reordering issue in read code path Quoting the bug report: Due to compiler optimization or CPU out-of-order execution, the desc->length update can be reordered before the memmove. If this happens, wdm_read() can see the new length and call copy_to_user() on uninitialized memory. This also violates LKMM data race rules [1]. Fix it by using WRITE_ONCE and memory barriers.
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 54/100 over 6619 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: afba937e540c902c989cd516fd97ea0c8499bb27 , < 638328ca9c17ae6511ad62198c57bae32ffa3c91 (git)
Affected: afba937e540c902c989cd516fd97ea0c8499bb27 , < 170e8daca24da6edb4be82ab01abf44e87af387b (git)
Affected: afba937e540c902c989cd516fd97ea0c8499bb27 , < c8fa96ed021923dae147bcd9f9205b8df7b82360 (git)
Affected: afba937e540c902c989cd516fd97ea0c8499bb27 , < 4ee3062bf2c9a722afef429826e8607eaf3fc6a0 (git)
Affected: afba937e540c902c989cd516fd97ea0c8499bb27 , < 276aef0fd2b92f41b920ac891c72cadeee957934 (git)
Affected: afba937e540c902c989cd516fd97ea0c8499bb27 , < 67ed312124bb1b61858778ac0b985b48961c862a (git)
Affected: afba937e540c902c989cd516fd97ea0c8499bb27 , < e3c874b05901dc519054b5107d16620e6d2b5fea (git)
Affected: afba937e540c902c989cd516fd97ea0c8499bb27 , < 8df672bfe3ec2268c2636584202755898e547173 (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.26
Unaffected: 0 , < 2.6.26 (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: 6.18.19 , ≤ 6.18.* (semver)
Unaffected: 6.19.9 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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        "id": "CVE-2026-43427",
        "lastModified": "2026-06-17T10:49:34.690",
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                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.2,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ]
        },
        "published": "2026-05-08T15:16:54.867",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/170e8daca24da6edb4be82ab01abf44e87af387b"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/276aef0fd2b92f41b920ac891c72cadeee957934"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/4ee3062bf2c9a722afef429826e8607eaf3fc6a0"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/638328ca9c17ae6511ad62198c57bae32ffa3c91"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/67ed312124bb1b61858778ac0b985b48961c862a"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/8df672bfe3ec2268c2636584202755898e547173"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/c8fa96ed021923dae147bcd9f9205b8df7b82360"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/e3c874b05901dc519054b5107d16620e6d2b5fea"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-125"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-02T19:16:28+00:00",
      "cve": "CVE-2026-43427",
      "id": "CVE-2026-43427",
      "initial_release_date": "2026-05-08T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: usb: class: cdc-wdm: fix reordering issue in read code path",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43427.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

Author Source Type Date Other

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.