{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-53235",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-53235"
  ],
  "published": "2026-06-25T08:41:40Z",
  "summary": "net: add pskb_may_pull() to skb_gro_receive_list()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: add pskb_may_pull() to skb_gro_receive_list()\n\nskb_gro_receive_list() calls skb_pull(skb, skb_gro_offset(skb)) without\nfirst ensuring the data is in the linear area via pskb_may_pull(). When\nthe skb arrives via napi_gro_frags(), skb_headlen can be 0 (all data in\npage fragments) while skb_gro_offset is non-zero (after IP+TCP header\nparsing). The skb_pull() then decrements skb->len by skb_gro_offset\nbut skb->data_len stays unchanged, hitting BUG_ON(skb->len < skb->data_len)\nin __skb_pull().\n\nThe UDP fraglist GRO path already contains this guard at\nudp_offload.c:749. Adding it to skb_gro_receive_list() itself provides\ncentralized protection for all callers (TCP, UDP, and any future\nprotocols), and ensures the precondition of skb_pull() is satisfied\nbefore it is called.\n\nOn pskb_may_pull() failure, set NAPI_GRO_CB(skb)->flush = 1 so the\nskb is not held as a new GRO head and is instead delivered through the\nnormal receive path, matching the UDP handling.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
    }
  ],
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-53235"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9e636c995b7beeb74ea882968248752821c244c4"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0cde3a004119db637b401c54e77536e4145fc0b4"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/848571dcbbbea7ba44dd4f7ebe1fbb274afe08ac"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f2bb3434544454099a5b6dec213567267b05d79d"
    }
  ],
  "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": 7.5,
      "cvss_v3_severity": "High",
      "scenario": "AV:N - The vulnerable GRO path processes received IPv4/IPv6 TCP packets in the network stack before socket authentication or routing decisions. A remote peer can send crafted same-flow packets to an exposed interface with fraglist GRO enabled.\nAC:L - Given a vulnerable deployment with rx-gro-list enabled, the attacker controls the packet stream, header layout, checksums, and sequencing needed to reach skb_gro_receive_list(). No race or victim state outside the attacker\u2019s packet timing is required.\nPR:N - The code runs on unauthenticated packet receive before any application or TCP connection authorization. No local account or kernel capability is required for a remote sender.\nUI:N - Exploitation only requires packet delivery to the target network interface. No victim user action is needed.\nS:U - The impact is within the kernel/network stack security authority of the targeted system. There is no VM, IOMMU, or sandbox boundary crossing.\nC:N - The bug triggers an internal skb length invariant failure in __skb_pull() and immediately BUGs. I found no out-of-bounds read, use-after-free, or usable information disclosure primitive before the crash.\nI:N - The vulnerable operation corrupts skb metadata only enough to trip the immediate BUG_ON path. It does not provide an attacker-controlled write or persistent data modification primitive.\nA:H - The reachable failure is BUG() in __skb_pull(), causing a kernel oops/panic or loss of system availability. A remote attacker can repeat the packet sequence to repeatedly crash affected deployments."
    }
  }
}