{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-64007",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-64007"
  ],
  "published": "2026-07-19T14:56:29Z",
  "summary": "netfilter: synproxy: refresh tcphdr after skb_ensure_writable",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: synproxy: refresh tcphdr after skb_ensure_writable\n\nsynproxy_tstamp_adjust() rewrites the TCP timestamp option in place\nand then patches the TCP checksum via inet_proto_csum_replace4() on\nthe caller-supplied tcphdr pointer.  Both ipv4_synproxy_hook() and\nipv6_synproxy_hook() obtain that pointer with skb_header_pointer()\nbefore calling in, so it may either alias skb->head directly or\npoint at the caller's on-stack _tcph buffer.\n\nBetween obtaining the pointer and using it, the function calls\nskb_ensure_writable(skb, optend), which on a cloned or non-linear\nskb invokes pskb_expand_head() and frees the old skb->head.  After\nthat point the cached th is stale:\n\n    caller (ipv[46]_synproxy_hook)\n      th = skb_header_pointer(skb, ..., &_tcph)\n      synproxy_tstamp_adjust(skb, protoff, th, ...)\n        skb_ensure_writable(skb, optend)\n          pskb_expand_head()        /* kfree(old skb->head) */\n        ...\n        inet_proto_csum_replace4(&th->check, ...)\n                                    /* writes into freed head, or\n                                       into the caller's stack copy\n                                       leaving the on-wire checksum\n                                       stale */\n\nThe option bytes are written through skb->data and are fine; only\nthe checksum update goes through th and so lands in the wrong\nplace.  The result is either a write into freed slab memory or a\npacket leaving with a checksum that does not match its payload.\n\nFix by re-deriving th from skb->data + protoff immediately after\nskb_ensure_writable() succeeds, so the subsequent checksum update\ntargets the linear, writable header.",
  "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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      "cvss_v3_score": 9.8,
      "cvss_v3_severity": "Critical",
      "scenario": "AV:N - The bug is triggered when remote TCP packets traverse SYNPROXY netfilter hooks (NF_INET_LOCAL_IN / NF_INET_POST_ROUTING) on a host with SYNPROXY configured, which is the standard internet-facing firewall/router deployment for this subsystem.\nAC:L - An attacker who controls a TCP session through SYNPROXY can reliably send timestamp-bearing packets to hit the vulnerable path; the stale-pointer UAF write occurs whenever skb_ensure_writable() must expand a cloned skb, which the attacker can influence by sustaining traffic on the proxied connection.\nPR:N - Exploitation requires only that the victim already runs SYNPROXY (normal for protected services); the remote attacker needs no credentials or local privileges on the target system to send the triggering TCP packets.\nUI:N - No victim user action is required beyond normal network operation; exploitation is fully automated via crafted or sustained TCP traffic through the SYNPROXY session.\nS:U - Impact is confined to kernel memory on the affected host running SYNPROXY; this is standard kernel privilege escalation/memory corruption, not a cross-VM or cross-security-boundary escape.\nC:H - The stale tcphdr pointer causes inet_proto_csum_replace4() to write into freed slab memory, a use-after-free class bug that can be leveraged for arbitrary kernel memory read via heap grooming techniques.\nI:H - The out-of-bounds write into freed slab memory via a stale tcphdr pointer is a use-after-free write primitive that can be developed into arbitrary kernel memory writes and local privilege escalation.\nA:H - Writing into freed slab memory can corrupt adjacent kernel objects and cause kernel oops, panic, or crash, and UAF conditions are inherently capable of destabilizing the system even during exploitation attempts."
    }
  }
}