{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "cfb6eeb4c860592edd123fdea908d23c6ad1c7dc"
            },
            {
              "fixed": "821c8751fdeecdeecabeb11704dd33439c9e4bbc"
            },
            {
              "fixed": "ff44ec94d4fc8348600a69de0a8fa1102c23bce8"
            },
            {
              "fixed": "345a9530756528d7ca407663d659c3c40e75c3dd"
            },
            {
              "fixed": "5d305a95130a8d08b9545e47f1e18d29d59866cb"
            },
            {
              "fixed": "02669e2a4d207068edce7e8b5fafd85822018ce6"
            },
            {
              "fixed": "ae3831b44f477de048287493e184fc3ff913b624"
            },
            {
              "fixed": "b502e97e29d791ff7a8051f29a414535739be218"
            },
            {
              "fixed": "46d0d6f50dab706637f4c18a470aac20a21900d3"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.6.20"
            },
            {
              "fixed": "5.10.253"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.210"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.167"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.130"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.78"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.19"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "6.19.9"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43383.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/tcp-md5: Fix MAC comparison to be constant-time\n\nTo prevent timing attacks, MACs need to be compared in constant\ntime.  Use the appropriate helper function for this.",
  "id": "CVE-2026-43383",
  "modified": "2026-07-08T05:37:40.251015146Z",
  "published": "2026-05-08T14:21:30.704Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/02669e2a4d207068edce7e8b5fafd85822018ce6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/345a9530756528d7ca407663d659c3c40e75c3dd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/46d0d6f50dab706637f4c18a470aac20a21900d3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5d305a95130a8d08b9545e47f1e18d29d59866cb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/821c8751fdeecdeecabeb11704dd33439c9e4bbc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ae3831b44f477de048287493e184fc3ff913b624"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b502e97e29d791ff7a8051f29a414535739be218"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ff44ec94d4fc8348600a69de0a8fa1102c23bce8"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43383.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43383"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "net/tcp-md5: Fix MAC comparison to be constant-time"
}