{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-39972",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2025-39972"
  ],
  "published": "2025-10-15T07:57:23Z",
  "summary": "i40e: fix idx validation in i40e_validate_queue_map",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ni40e: fix idx validation in i40e_validate_queue_map\n\nEnsure idx is within range of active/initialized TCs when iterating over\nvf->ch[idx] in i40e_validate_queue_map().",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-39972"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b6cb93a7ff208f324c7ec581d72995f80e115e0e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6f15a7b34fae75e745bdc2ec05e06ddfd0dd2f3c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/34dfac0c904829967d500c51f216916ce1452957"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/4d5e804a9e19b639b18fd13664dbad3c03c79e61"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/50a1e2f50f6c22b93b94eb8d168a1be3c05bf5cd"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/cc4191e8ef40d2249c1b9a8617d22ec8a976b574"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d4e3eaaa3cb3af77836d806c89cd6ebf533a7320"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/aa68d3c3ac8d1dcec40d52ae27e39f6d32207009"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T12:19:11Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 8.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The vulnerable code is the host PF driver's virtchnl mailbox handler, reached by a VF writing a `VIRTCHNL_OP_CONFIG_IRQ_MAP` message over PCIe, not by any network protocol. This is the standard local/guest-to-host vector used for SR-IOV VF-to-PF interface bugs.\nAC:L - The attacker fully controls both preconditions from inside the VF \u2014 it sends `VIRTCHNL_OP_ENABLE_CHANNELS` with `num_tc < 4` and then a crafted `CONFIG_IRQ_MAP` with high queue-map bits set; the sequence is deterministic with no race or memory-layout dependency. The `spoofchk off` requirement is inherent to every deployment where ADq is used at all, i.e. exactly the deployments where the code is reachable.\nPR:L - The attacker needs only control of a VF that has been legitimately assigned to them \u2014 root inside their own guest VM or container, which is the normal granted privilege level of an SR-IOV tenant. No privilege on the host or in the PF's security authority is required, and the PF handler applies no capability or \"trusted VF\" check to this opcode.\nUI:N - The malicious VF driver sends the virtchnl messages entirely on its own initiative. No action by the host administrator or any other tenant is needed once a VF is assigned.\nS:C - The attacker is confined to a VF/guest security authority, but the bypassed validation causes the host PF driver to program hardware queue-interrupt registers (`I40E_QINT_RQCTL`/`I40E_QINT_TQCTL`) for queues outside the VF's allocation \u2014 resources owned by the PF (host) and by other VFs (other tenants). Impact therefore lands beyond the vulnerable component's security authority, as in a guest-to-host/cross-tenant escape.\nC:H - `i40e_vc_isvalid_queue_id()` is invoked with a stale/zero VSI id and performs no ownership check, letting a VF get its queue map validated against a VSI belonging to the PF or another VF and then attach foreign queues to its own MSI-X vector, exposing another tenant's data-path activity. Cross-tenant exposure of resources the VF has no right to observe warrants High.\nI:H - When the gate wrongly passes, `i40e_config_irq_link_list()` writes MMIO interrupt-control registers at PF-relative queue indices derived from unvalidated VF input, modifying hardware state owned by the PF and by other VFs. Unauthorized modification of another security authority's device configuration is a High integrity impact.\nA:H - Misprogramming `QINT_RQCTL`/`QINT_TQCTL` for queues belonging to the PF or other VFs breaks their Rx/Tx interrupt delivery, stalling the host's and co-tenant VMs' network data paths; queue contexts can also be pointed at `I40E_QUEUE_END_OF_LIST`, wedging the link list. A single unprivileged VF can repeat this at will, denying service to the whole port."
    }
  }
}