ipv6: sit: reload inner IPv6 header after GSO offloads_CVE-2026-53228

{
    "lastseen": "",
    "description": "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.",
    "published": "2026-06-25T08:39:27.893Z",
    "modified": "2026-06-28T06:40:38.747Z",
    "type": "cve",
    "title": "ipv6: sit: reload inner IPv6 header after GSO offloads",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/fddd41445a0537b093e6b3f6232c9933cad1e48b\nhttps://git.kernel.org/stable/c/1132e5edc2866c3530be17622153a597095f0e43\nhttps://git.kernel.org/stable/c/9c67b44edb3598d234efae6e44649eb993c03da5\nhttps://git.kernel.org/stable/c/0bfa7bba1f41aaf5f0604dc712bb4701493e3aa0\nhttps://git.kernel.org/stable/c/59f80c919713250fe5d25a4d9aea4e49580fa1d4\nhttps://git.kernel.org/stable/c/2fa49b2715e1bad12ce3b0fa64e234d9582c8193\nhttps://git.kernel.org/stable/c/cb658c2f5f7977c2a1c77c9f239f4bc8196edb5c\nhttps://git.kernel.org/stable/c/f0e42f0c4337b1f220de1ddd63f47197c7dee4de",
    "id": "CVE-2026-53228",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Linux Linux 14909664e4e192f4c6f6fcdccd9919af7cf783ab\nLinux Linux 14909664e4e192f4c6f6fcdccd9919af7cf783ab\nLinux Linux 14909664e4e192f4c6f6fcdccd9919af7cf783ab\nLinux Linux 14909664e4e192f4c6f6fcdccd9919af7cf783ab\nLinux Linux 14909664e4e192f4c6f6fcdccd9919af7cf783ab\nLinux Linux 14909664e4e192f4c6f6fcdccd9919af7cf783ab\nLinux Linux 14909664e4e192f4c6f6fcdccd9919af7cf783ab\nLinux Linux 14909664e4e192f4c6f6fcdccd9919af7cf783ab\nLinux Linux 3.18",
    "sourceHref": "",
    "cvss": {
        "score": 9.8,
        "severity": "CRITICAL",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Linux",
    "version": "14909664e4e192f4c6f6fcdccd9919af7cf783ab",
    "vendor": "Linux",
    "ai_description": "A vulnerability in the Linux kernel allows an attacker to read from a freed skb head after the old head's remaining clone is released, potentially leading to information disclosure or other security issues.",
    "ai_severity": "Critical",
    "ai_vendor": "Linux",
    "ai_product": "Linux Kernel",
    "ai_version": "3.18, 14909664e4e192f4c6f6fcdccd9919af7cf783ab",
    "ai_score": 9.8
}