{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "346af67b8d116f01ef696fd47959a55deb2db8b6"
            },
            {
              "fixed": "0f37d1e65c6d71ad94ccfb5c602163c525db789d"
            },
            {
              "fixed": "257cdb960d8ff6d60bb6461b03c814b6cf0c9e64"
            },
            {
              "fixed": "c34577f517b556fb6ca173d45bf7e766ae2564ce"
            },
            {
              "fixed": "f71695e81f4cb428f3c7e2138eae88199005b52c"
            },
            {
              "fixed": "82f342b3b006ca1d65f4890c05f2ec32fcb808b6"
            },
            {
              "fixed": "50fb64defa72a3fecd0af1ca7c6b47b5c5c2b257"
            },
            {
              "fixed": "40ba329e8b4cd2fb11b0caf5e6a543ceaebb6009"
            },
            {
              "fixed": "b8dbe9648d69059cfe3a28917bfbf7e61efd7f15"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.4.0"
            },
            {
              "fixed": "5.10.253"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.203"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.168"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.134"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.81"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.22"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "6.19.12"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43020.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: MGMT: validate LTK enc_size on load\n\nLoad Long Term Keys stores the user-provided enc_size and later uses\nit to size fixed-size stack operations when replying to LE LTK\nrequests. An enc_size larger than the 16-byte key buffer can therefore\noverflow the reply stack buffer.\n\nReject oversized enc_size values while validating the management LTK\nrecord so invalid keys never reach the stored key state.",
  "id": "CVE-2026-43020",
  "modified": "2026-07-08T05:35:55.414010300Z",
  "published": "2026-05-01T14:15:23.699Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0f37d1e65c6d71ad94ccfb5c602163c525db789d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/257cdb960d8ff6d60bb6461b03c814b6cf0c9e64"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/40ba329e8b4cd2fb11b0caf5e6a543ceaebb6009"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/50fb64defa72a3fecd0af1ca7c6b47b5c5c2b257"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/82f342b3b006ca1d65f4890c05f2ec32fcb808b6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b8dbe9648d69059cfe3a28917bfbf7e61efd7f15"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c34577f517b556fb6ca173d45bf7e766ae2564ce"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f71695e81f4cb428f3c7e2138eae88199005b52c"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43020.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43020"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.7.5",
  "summary": "Bluetooth: MGMT: validate LTK enc_size on load"
}