GHSA-5Q2P-7748-G6QP

Vulnerability from github – Published: 2026-06-25 09:31 – Updated: 2026-10-15 03:36
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

ipv6: sit: reload inner IPv6 header after GSO offloads

ipip6_tunnel_xmit() caches the inner IPv6 header pointer at function entry and continues using it after iptunnel_handle_offloads().

For GSO skbs, iptunnel_handle_offloads() calls skb_header_unclone(). When the skb header is cloned, skb_header_unclone() can call pskb_expand_head(), which may move the skb head. The pskb_expand_head() contract requires pointers into the skb header to be reloaded after the call.

If the later skb_realloc_headroom() branch is not taken, SIT uses the stale iph6 pointer to read the inner hop limit and DS field. That can read from a freed skb head after the old head's remaining clone is released.

Reload iph6 after the offload helper succeeds and before subsequent reads from the inner IPv6 header. Keep the existing reload after skb_realloc_headroom(), since that branch can also replace the skb.

Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-53228"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-25T09:16:40Z",
    "severity": "CRITICAL"
  },
  "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\u0027s 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": "GHSA-5q2p-7748-g6qp",
  "modified": "2026-10-15T03:36:16Z",
  "published": "2026-06-25T09:31:21Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53228"
    },
    {
      "type": "WEB",
      "url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"
    },
    {
      "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"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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