{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-68127",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-68127"
  ],
  "published": "2026-08-10T12:08:00Z",
  "summary": "ila: reload IPv6 header after pskb_may_pull in checksum adjust",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nila: reload IPv6 header after pskb_may_pull in checksum adjust\n\nila_csum_adjust_transport() caches ip6h = ipv6_hdr(skb) before calling\npskb_may_pull(). On a non-linear skb whose transport header sits in a page\nfragment, pskb_may_pull() can call __pskb_pull_tail() / pskb_expand_head()\nand free the old skb head, leaving ip6h dangling; the following\nget_csum_diff(ip6h, p) then reads freed memory. ila_update_ipv6_locator()\nuses ip6h (and the iaddr derived from it) again after the csum-adjust\ncall and additionally writes the new locator through that pointer.\n\nImpact: a remote IPv6 packet routed through a configured ILA\ncsum-adjust-transport route or receive-side mapping triggers a\nslab-use-after-free in ila_update_ipv6_locator() (KASAN). The route or\nmapping requires CAP_NET_ADMIN to configure, but trigger packets are\nunauthenticated once it exists.\n\nReload ip6h after each pskb_may_pull() in ila_csum_adjust_transport()\nbefore the csum-diff read. In ila_update_ipv6_locator() only the\nILA_CSUM_ADJUST_TRANSPORT case pulls the skb, so reload ip6h and iaddr in\nthat case alone before the destination-address write; the neutral-map\nmodes never pull and keep their cached pointers.",
  "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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            "upstream_fixed": "6.18.42"
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    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-68127"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e451a904606c571f731ef7a06b3398619dce5300"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1eadcb43893b897ade85ac5bf5c618054bc3c655"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ba353caafb06ccee57b78d3254e3cebf1dea4a93"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/896a9512d0d83c2a4b357e5585b7b62a8e3f95c1"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/7097a0280b178237265681be66d1bef11d15894b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/472aba2603ca74c4f7722cb0c0296942b0776b8d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c6a13ae00dab3a1a8c7cf2f843f0fc9e8d4b0ccc"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/92d3817649df2b0b6a008a686c8275c88d7ef594"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-19T16:47:12Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 9.8,
      "cvss_v3_severity": "Critical",
      "scenario": "AV:N - The bug is reached from ipv6_rcv() through NF_INET_PRE_ROUTING (ila_nf_input) or IPv6 routing/LWT input/output when remote IPv6 packets matching a configured ILA csum-adjust-transport mapping or route are processed; no local syscall is required on internet-facing routers, gateways, or NVO3/overlay hosts.\nAC:L - Once ILA csum-adjust-transport is configured, a remote attacker can reliably send IPv6 TCP/UDP/ICMPv6 packets whose transport headers live in skb page fragments so pskb_may_pull() reallocates the head; they control packet layout and can retry without races or uncontrollable memory layout.\nPR:N - Trigger packets are processed unauthenticated on the network datapath; although ILA routes/mappings require CAP_NET_ADMIN to install, that is operator infrastructure (also obtainable in a user netns), not a privilege the remote attacker needs to send the malformed IPv6 packets that hit ila_update_ipv6_locator().\nUI:N - No victim user action is required beyond normal IPv6 packet delivery; exploitation is fully automated once the affected ILA configuration exists and the attacker sends crafted packets to the host.\nS:U - The slab use-after-free corrupts kernel packet-processing memory within the host kernel security authority; it is not a VM escape, container breakout, or IOMMU/DMA boundary bypass.\nC:H - ila_csum_adjust_transport() reads the cached IPv6 header via get_csum_diff(ip6h, p) after pskb_may_pull() frees the old skb head, causing a slab use-after-free read of freed memory that can disclose kernel heap contents.\nI:H - ila_update_ipv6_locator() then writes iaddr->loc = p->locator through the same stale iaddr pointer derived from the freed header, giving a slab use-after-free write primitive that can be leveraged for arbitrary memory corruption and control-flow hijacking.\nA:H - The freed skb-head slab use-after-free was reproduced under KASAN and can cause kernel oops/panic during IPv6 receive/forwarding; even unsuccessful exploitation typically crashes or destabilizes the host."
    }
  }
}