{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "5609c185f24dffca5f6a9c127106869da150be03"
            },
            {
              "fixed": "f24a58c72a45f4c109f3557a760cc4b60b7a6037"
            },
            {
              "fixed": "da8cbb64b47e9066b40af0de170901caf17b768c"
            },
            {
              "fixed": "4485d79617520d84ba5a14515e2b5136007d6deb"
            },
            {
              "fixed": "06ce6fc106b16dec9b535950db626261be865e5b"
            },
            {
              "fixed": "dcb1bec1c32ee5c3878354e087cf5dbee2b7c7af"
            },
            {
              "fixed": "c32f30ef5e66adbfa102348e2e8a23776eb007cb"
            },
            {
              "fixed": "da8808463882c3f3c357b072e25053c2121f1419"
            },
            {
              "fixed": "2a58899d11009bffc7b4b32a571858f381121837"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.6.0"
            },
            {
              "fixed": "5.10.259"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.210"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.176"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.143"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.94"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.36"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.0.13"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53263.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\n6lowpan: fix off-by-one in multicast context address compression\n\nThe second memcpy in lowpan_iphc_mcast_ctx_addr_compress() uses\n\u0026data[1] as destination and \u0026ipaddr-\u003es6_addr[11] as source, but\nboth should be offset by one: \u0026data[2] and \u0026ipaddr-\u003es6_addr[12]\nrespectively.\n\nThis off-by-one has two consequences:\n1. data[1] is overwritten with s6_addr[11], corrupting the RIID\n   field in the compressed multicast address\n2. data[5] is never written, so uninitialized kernel stack memory\n   is transmitted over the network via lowpan_push_hc_data(),\n   leaking kernel stack contents\n\nThe correct inline data layout must match what the decompression\nfunction lowpan_uncompress_multicast_ctx_daddr() expects:\n  data[0..1] = s6_addr[1..2]  (flags/scope + RIID)\n  data[2..5] = s6_addr[12..15] (group ID)\n\nAlso zero-initialize the data array as a defensive measure against\nsimilar bugs in the future.",
  "id": "CVE-2026-53263",
  "modified": "2026-07-09T03:51:35.943333406Z",
  "published": "2026-06-25T08:39:51.215Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/06ce6fc106b16dec9b535950db626261be865e5b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2a58899d11009bffc7b4b32a571858f381121837"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4485d79617520d84ba5a14515e2b5136007d6deb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c32f30ef5e66adbfa102348e2e8a23776eb007cb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/da8808463882c3f3c357b072e25053c2121f1419"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/da8cbb64b47e9066b40af0de170901caf17b768c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dcb1bec1c32ee5c3878354e087cf5dbee2b7c7af"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f24a58c72a45f4c109f3557a760cc4b60b7a6037"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53263.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53263"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.7.5",
  "summary": "6lowpan: fix off-by-one in multicast context address compression"
}