{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-63987",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-63987"
  ],
  "published": "2026-07-19T14:56:29Z",
  "summary": "ethtool: coalesce: cap profile updates at NET_DIM_PARAMS_NUM_PROFILES",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nethtool: coalesce: cap profile updates at NET_DIM_PARAMS_NUM_PROFILES\n\nethnl_update_profile() walks the ETHTOOL_A_PROFILE_IRQ_MODERATION\nnest list with an index 'i' and writes new_profile[i++] without\nbounding i. The destination is kmemdup()'d at NET_DIM_PARAMS_NUM_PROFILES\nentries (5), but the Netlink nest count is entirely user-controlled.\nNetlink policies do not have support for constraining the number\nof nested entries (or number of multi-attr entries).",
  "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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      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-63987"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d4c9cc7c47781c6f4fa29d80a1193a8bcd1525bc"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0c02c190bcd9822477038ff2cee10ea584ac1b1d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6205f7166d2dd14a017a5802c81e5bd1421a8635"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/7281b096b072f6c6e30420e3467d738f2e4c4b57"
    }
  ],
  "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": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The bug is reached only through the ETHTOOL_MSG_COALESCE_SET generic-netlink ioctl path (ethnl_default_set_doit \u2192 ethnl_set_coalesce \u2192 ethnl_update_profile), not via remote network packets or physical bus access.\nAC:L - An attacker with CAP_NET_ADMIN can send a crafted netlink message with more than five nested ETHTOOL_A_PROFILE_IRQ_MODERATION attributes and deterministically trigger a heap buffer overflow past the five-entry kmemdup buffer.\nPR:L - ETHTOOL_MSG_COALESCE_SET is gated by GENL_UNS_ADMIN_PERM, which requires CAP_NET_ADMIN in the socket's network namespace user namespace; this capability is obtainable by an unprivileged user via user namespaces (unshare -Urn) or containers granted NET_ADMIN (e.g., hostNetwork pods).\nUI:N - Exploitation requires only the attacker's own ethtool netlink SET_COALESCE request with a malformed profile nest; no action by another user or victim is needed.\nS:U - The vulnerability corrupts kernel heap memory within the same kernel security domain; it does not by itself cross a VM, container, or IOMMU boundary to affect a separate security authority.\nC:H - The out-of-bounds writes past the 120-byte (5 \u00d7 24-byte dim_cq_moder) kmalloc allocation can corrupt adjacent slab objects, providing a standard heap-corruption primitive that can be leveraged for arbitrary kernel memory disclosure.\nI:H - The attacker fully controls the overflowed u16 profile fields (usec, pkts, comps) written beyond the allocation boundary, enabling heap metadata or adjacent-object corruption that can be developed into arbitrary kernel write or code execution.\nA:H - Heap corruption from unbounded profile indexing can cause immediate kernel oops/panic during the write or when the corrupted profile is subsequently used by DIM/virtio-net interrupt moderation paths."
    }
  }
}