{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-39969",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2025-39969"
  ],
  "published": "2025-10-15T07:57:23Z",
  "summary": "i40e: fix validation of VF state in get resources",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ni40e: fix validation of VF state in get resources\n\nVF state I40E_VF_STATE_ACTIVE is not the only state in which\nVF is actually active so it should not be used to determine\nif a VF is allowed to obtain resources.\n\nUse I40E_VF_STATE_RESOURCES_LOADED that is set only in\ni40e_vc_get_vf_resources_msg() and cleared during reset.",
  "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-2025-39969"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/185745d56ec958bf8aa773828213237dfcc32f5a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f47876788a23de296c42ef9d505b5c1630f0b4b8"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8e35c80f8570426fe0f0cc92b151ebd835975f22"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6c3981fd59ef11a75005ac9978f034da5a168b6a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e748f1ee493f88e38b77363a60499f979d42c58a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6128bbc7adc25c87c2f64b5eb66a280b78ef7ab7"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a991dc56d3e9a2c3db87d0c3f03c24f6595400f1"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/877b7e6ffc23766448236e8732254534c518ba42"
    }
  ],
  "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 attack is delivered over the i40e SR-IOV virtchnl mailbox by a VF the attacker already controls (guest VM with VF passthrough, or a VFIO-owning container), not over any network protocol. This is local access from the attacking context into the host PF driver.\nAC:L - `VIRTCHNL_OP_GET_VF_RESOURCES` is accepted unconditionally whenever `I40E_VF_STATE_INIT` is set, so the VF can replay it deterministically at any time with no grooming; the deterministic damage (filter teardown, `driver_caps`/`RDMAENA` reset, spurious `ACTIVE`) needs no race at all, and the freed-VSI window is widened by the handler's own `GFP_KERNEL` sleep, which the attacker can hammer at will.\nPR:L - The attacker only needs the ability 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 with respect to the host PF driver under attack. No host-side privileges are required.\nUI:N - The malicious VF sends the virtchnl messages entirely on its own initiative. No host administrator or other user action is needed at any point.\nS:C - The attacker executes in a guest VM (or VF-assigned container) while the corrupted state, the freed-VSI accesses, and the MAC-filter/MMIO programming all occur in the host PF driver's security authority. Impact reaches the hypervisor and other VFs/guests sharing the adapter, crossing the guest/host boundary.\nC:H - The unserialized handler reads `vsi->info.pvid`, `vsi->alloc_queue_pairs` and `vsi->info.qs_handle[0]` from a VSI that `i40e_free_vf_res()` may have already released and echoes those values back to the guest in the `virtchnl_vf_resource` reply, turning a use-after-free read into a direct host-memory disclosure channel. The VF can also read back state belonging to the PF's main VSI when `lan_vsi_idx` has been zeroed.\nI:H - The same path performs `spin_lock_bh(&vsi->mac_filter_hash_lock)` and `i40e_del_mac_filter()` \u2014 lock and hash-list writes \u2014 on freed memory, a classic UAF write primitive, and can be aimed at `pf->vsi[0]` (the host's main VSI) to delete the host's own L2 filters. Re-toggling `I40E_VF_STATE_RDMAENA` additionally re-opens `i40e_config_rdma_qvlist()`, which programs `I40E_VPINT_CEQCTL` from an unvalidated VF-supplied index.\nA:H - Dereferencing a released `struct i40e_vsi` and taking a spinlock inside freed memory will oops or panic the host kernel, and tearing down a live VF's MAC filters plus corrupting the PF's ACTIVE/RDMA state wedges networking for that VF and the adapter. A host panic takes down the hypervisor and every guest on it, and the VF can retrigger the condition indefinitely."
    }
  }
}