{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-53228",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-53228"
  ],
  "published": "2026-06-25T08:41:40Z",
  "summary": "ipv6: sit: reload inner IPv6 header after GSO offloads",
  "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.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f0e42f0c4337b1f220de1ddd63f47197c7dee4de"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 9.8,
      "cvss_v3_severity": "Critical",
      "scenario": "AV:N - The vulnerable SIT transmit path can be reached by network-triggered IPv6 traffic in a reasonable deployment where a public service or router sends large TCP/GSO packets through a configured SIT tunnel.\nAC:L - There is no race or fragile timing requirement; GSO and header-cloned TCP skbs are normal for large TCP transmissions, and the attacker can repeatedly trigger them with network traffic.\nPR:N - In the network-triggered scenario, the attacker does not need local privileges or authentication; the required SIT configuration is an environmental precondition on the victim.\nUI:N - No victim user action is required beyond the system processing network traffic through the configured SIT tunnel.\nS:U - The impact remains within the kernel and its networking security authority, with no VM, IOMMU, or separate security-scope boundary crossed.\nC:H - The stale inner IPv6 header pointer can read from freed skb head memory after `skb_header_unclone()`/`pskb_expand_head()`, making this a kernel use-after-free read. Per kernel CVSS guidance, use-after-free conditions are scored with high confidentiality impact.\nI:H - Although the immediate stale access feeds header fields, it is a kernel use-after-free in attacker-triggerable networking memory, and kernel UAFs are treated as potentially exploitable for heap manipulation and integrity compromise.\nA:H - Use-after-free in the kernel networking transmit path can lead to oops, panic, or repeated crash conditions, especially under memory debugging or unfavorable heap reuse."
    }
  }
}