{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-39971",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2025-39971"
  ],
  "published": "2025-10-15T07:57:23Z",
  "summary": "i40e: fix idx validation in config queues msg",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ni40e: fix idx validation in config queues msg\n\nEnsure idx is within range of active/initialized TCs when iterating over\nvf->ch[idx] in i40e_vc_config_queues_msg().",
  "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-2025-39971"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a6ff2af78343eceb0f77ab1a2fe802183bc21648"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f5f91d164af22e7147130ef8bebbdb28d8ecc6e2"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1fa0aadade34481c567cdf4a897c0d4e4d548bd1"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8b9c7719b0987b1c6c5fc910599f3618a558dbde"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2cc26dac0518d2fa9b67ec813ee60e183480f98a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/bfcc1dff429d4b99ba03e40ddacc68ea4be2b32b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5c1f96123113e0bdc6d8dc2b0830184c93da9f65"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f1ad24c5abe1eaef69158bac1405a74b3c365115"
    }
  ],
  "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 malicious input arrives as a `VIRTCHNL_OP_CONFIG_VSI_QUEUES` message on the SR-IOV VF\u2192PF admin-queue mailbox, a PCIe transport, not a network protocol. The attacker needs local control of an assigned VF (guest VM or VF-owning container), so this is local reachability rather than network or adjacent.\nAC:L - The attacker fully controls every input \u2014 `num_tc` and per-TC `count` via ENABLE_CHANNELS, then `num_queue_pairs` and the qpair array via CONFIG_VSI_QUEUES \u2014 so shrinking `num_tc` to leave stale `ch[]` entries and then walking `idx` into them is deterministic on the first attempt with no memory grooming or race. The only precondition, spoofchk disabled, is inherent to any ADq-enabled SR-IOV deployment and is a standard runtime configuration.\nPR:L - The attacker only needs to drive the VF's admin queue \u2014 kernel/root inside the assigned guest, or possession of the VFIO device \u2014 which is a low-privileged position relative to the host PF driver under attack. No privileges of any kind on the host are required.\nUI:N - The malicious VF sends the virtchnl message sequence entirely on its own initiative. No host administrator or other user action is needed at any stage.\nS:C - The attacking VF sits in a guest VM (or VF-assigned container) while the stale-index read and the resulting hardware queue-context programming occur in the host PF driver's security authority. The corrupted resources \u2014 HMC LAN Tx/Rx contexts and QTX_CTL bindings of VSIs belonging to the PF or to other VFs \u2014 are outside the attacker's scope, crossing the guest/host and inter-tenant SR-IOV boundary.\nC:H - Using a stale `ch[idx].vsi_id`, the VF resolves and reprograms the Rx queue context of a VSI it does not own, setting `rx_ctx.base` from its own `dma_ring_addr` so another VSI's received traffic is DMA'd into attacker-designated memory \u2014 interception of host and cross-guest traffic. On pre-5.2 kernels the same defect additionally reads past the end of `vf->ch[]` into adjacent `struct i40e_vf` state.\nI:H - `i40e_config_vsi_rx_queue()` performs no ownership check and `i40e_config_vsi_tx_queue()` validates only the VF-supplied `info->vsi_id`, so the stale ID lets the VF clear and rewrite the LAN HMC Tx/Rx contexts of a foreign VSI's queues and issue a `QTX_CTL` write rebinding that PF queue to itself. This is attacker-controlled modification of host- and peer-owned hardware state.\nA:H - Clearing and rewriting queue contexts belonging to the PF's main VSI or another guest's VSI stalls or wedges those queues, and out-of-range `pf_queue_id` values (`I40E_QUEUE_END_OF_LIST`) drive HMC operations that trigger adapter error paths, PF/VF reset storms and loss of host networking. The VF can repeat the sequence at will, and a downed host PF takes every guest on the adapter with it."
    }
  }
}