{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "14909664e4e192f4c6f6fcdccd9919af7cf783ab"
            },
            {
              "fixed": "fddd41445a0537b093e6b3f6232c9933cad1e48b"
            },
            {
              "fixed": "1132e5edc2866c3530be17622153a597095f0e43"
            },
            {
              "fixed": "9c67b44edb3598d234efae6e44649eb993c03da5"
            },
            {
              "fixed": "0bfa7bba1f41aaf5f0604dc712bb4701493e3aa0"
            },
            {
              "fixed": "59f80c919713250fe5d25a4d9aea4e49580fa1d4"
            },
            {
              "fixed": "2fa49b2715e1bad12ce3b0fa64e234d9582c8193"
            },
            {
              "fixed": "cb658c2f5f7977c2a1c77c9f239f4bc8196edb5c"
            },
            {
              "fixed": "f0e42f0c4337b1f220de1ddd63f47197c7dee4de"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.18.0"
            },
            {
              "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-2026-53228.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: sit: reload inner IPv6 header after GSO offloads\n\nipip6_tunnel_xmit() caches the inner IPv6 header pointer at function\nentry and continues using it after iptunnel_handle_offloads().\n\nFor GSO skbs, iptunnel_handle_offloads() calls skb_header_unclone().\nWhen the skb header is cloned, skb_header_unclone() can call\npskb_expand_head(), which may move the skb head. The pskb_expand_head()\ncontract requires pointers into the skb header to be reloaded after the\ncall.\n\nIf the later skb_realloc_headroom() branch is not taken, SIT uses the\nstale iph6 pointer to read the inner hop limit and DS field. That can\nread from a freed skb head after the old head's remaining clone is\nreleased.\n\nReload iph6 after the offload helper succeeds and before subsequent\nreads from the inner IPv6 header. Keep the existing reload after\nskb_realloc_headroom(), since that branch can also replace the skb.",
  "id": "CVE-2026-53228",
  "modified": "2026-07-08T05:37:50.195871839Z",
  "published": "2026-06-25T08:39:27.893Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0bfa7bba1f41aaf5f0604dc712bb4701493e3aa0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1132e5edc2866c3530be17622153a597095f0e43"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2fa49b2715e1bad12ce3b0fa64e234d9582c8193"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/59f80c919713250fe5d25a4d9aea4e49580fa1d4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9c67b44edb3598d234efae6e44649eb993c03da5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cb658c2f5f7977c2a1c77c9f239f4bc8196edb5c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f0e42f0c4337b1f220de1ddd63f47197c7dee4de"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fddd41445a0537b093e6b3f6232c9933cad1e48b"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53228.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53228"
    },
    {
      "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:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "ipv6: sit: reload inner IPv6 header after GSO offloads"
}