{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-31683",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-31683"
  ],
  "published": "2026-04-25T08:46:52Z",
  "summary": "batman-adv: avoid OGM aggregation when skb tailroom is insufficient",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: avoid OGM aggregation when skb tailroom is insufficient\n\nWhen OGM aggregation state is toggled at runtime, an existing forwarded\npacket may have been allocated with only packet_len bytes, while a later\npacket can still be selected for aggregation. Appending in this case can\nhit skb_put overflow conditions.\n\nReject aggregation when the target skb tailroom cannot accommodate the new\npacket. The caller then falls back to creating a new forward packet\ninstead of appending.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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      "url": "https://www.cve.org/CVERecord?id=CVE-2026-31683"
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    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
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      "scenario": "AV:L - A fully attacker-controlled trigger requires local control of batman-adv setup and the OGM aggregation toggle while injecting OGM traffic. Adjacent OGM frames can reach an existing mesh, but that path depends on a runtime aggregation toggle not controlled by the packet sender.\nAC:L - With local namespace control, the attacker can create the mesh setup, toggle aggregation, and send OGM traffic to deterministically reach the undersized queued skb append. No uncontrolled race or probabilistic condition is required in that scenario.\nPR:L - The required configuration control is CAP_NET_ADMIN, but batman-adv generic netlink uses namespace-capable admin permission, so an unprivileged local user can obtain it in a user namespace. No real init-namespace root privilege is required for that path.\nUI:N - Exploitation does not require a victim user to open a file, mount anything, or otherwise interact once the attacker controls the local namespace setup. The attacker can drive the trigger directly.\nS:U - The vulnerability corrupts or crashes kernel networking state within the same host kernel security authority. It does not cross a VM, IOMMU, or separate sandbox boundary by itself.\nC:H - The missing tailroom check creates an out-of-bounds skb append condition in kernel memory. Although common kernels may hit skb_over_panic first, the underlying memory-safety condition is defensibly scored as capable of exposing kernel data.\nI:H - The vulnerable path appends attacker-controlled OGM bytes past the allocated skb tailroom when the guard is absent. As a kernel out-of-bounds write condition, this is defensibly scored as high integrity impact.\nA:H - At minimum, insufficient tailroom reaches skb_put overflow handling, which triggers a BUG/oops/panic class failure. This can crash or destabilize the kernel, causing high availability impact."
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}