{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-31682",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-31682"
  ],
  "published": "2026-04-25T08:46:52Z",
  "summary": "bridge: br_nd_send: linearize skb before parsing ND options",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbridge: br_nd_send: linearize skb before parsing ND options\n\nbr_nd_send() parses neighbour discovery options from ns->opt[] and\nassumes that these options are in the linear part of request.\n\nIts callers only guarantee that the ICMPv6 header and target address\nare available, so the option area can still be non-linear. Parsing\nns->opt[] in that case can access data past the linear buffer.\n\nLinearize request before option parsing and derive ns from the linear\nnetwork header.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H"
    }
  ],
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      "url": "https://www.cve.org/CVERecord?id=CVE-2026-31682"
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      "scenario": "AV:N - The vulnerable code is reached by received IPv6/ICMPv6 Neighbor Solicitation traffic on a Linux bridge port before any protocol authentication. In bridged physical or virtual deployments, a network peer can send the crafted packet to the affected bridge path.\nAC:L - There is no race, and the attacker controls the packet contents and can repeat attempts to hit a non-linear skb receive path. Neighbor suppression and a valid neighbor/FDB state are deployment prerequisites, but not per-attempt conditions outside a reasonable affected configuration.\nPR:N - The packet receive path has no credential or authentication check before `br_nd_send()` is reached. CAP_NET_ADMIN is needed to configure bridge neighbor suppression, but exploiting an already configured bridge requires no privileges.\nUI:N - No victim user action is required once the bridge is in the affected configuration. The attacker only needs to send crafted network traffic.\nS:U - The vulnerable component and impacted resources are the same kernel networking/bridge security authority. This is not a hypervisor, IOMMU, or separate security-scope escape by itself.\nC:H - The bug is an out-of-bounds read past the skb linear area while parsing attacker-controlled ND options. The read data can influence bytes copied into the generated Neighbor Advertisement, and under the required rule an OOB read that is not strictly bounded to a few bytes is High.\nI:N - The vulnerable operation reads memory past the linear skb buffer but does not write to kernel memory or provide a direct data-modification primitive. The generated reply may be misaddressed, but the bug does not give meaningful integrity modification.\nA:H - Reading past the linear buffer can trigger a kernel fault/oops or panic depending on skb layout and memory mapping. The attack can be repeated remotely against the bridge receive path, making availability impact High."
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}