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CVE-2025-39968 (GCVE-0-2025-39968)

Vulnerability from cvelistv5 – Published: 2025-10-15 07:55 – Updated: 2026-08-05 12:06
VLAI
Title
i40e: add max boundary check for VF filters
Summary
In the Linux kernel, the following vulnerability has been resolved: i40e: add max boundary check for VF filters There is no check for max filters that VF can request. Add it.
Severity
7.3 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: e284fc280473bed23f2e1ed324e102a48f7d17e1 , < 9176e18681cb0d34c5acc87bda224f5652af2ab8 (git)
Affected: e284fc280473bed23f2e1ed324e102a48f7d17e1 , < e490d8c5a54e0dd1ab22417d72c3a7319cf0f030 (git)
Affected: e284fc280473bed23f2e1ed324e102a48f7d17e1 , < 77a35be582dff4c80442ebcdce24d45eed8a6ce4 (git)
Affected: e284fc280473bed23f2e1ed324e102a48f7d17e1 , < 02aae5fcdd34c3a55a243d80a1b328a35852a35c (git)
Affected: e284fc280473bed23f2e1ed324e102a48f7d17e1 , < edecce7abd7152b48e279b4fa0a883d1839bb577 (git)
Affected: e284fc280473bed23f2e1ed324e102a48f7d17e1 , < d33e5d6631ac4fddda235a7815babc9d3f124299 (git)
Affected: e284fc280473bed23f2e1ed324e102a48f7d17e1 , < 8b13df5aa877b9e4541e301a58a84c42d84d2d9a (git)
Affected: e284fc280473bed23f2e1ed324e102a48f7d17e1 , < cb79fa7118c150c3c76a327894bb2eb878c02619 (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.17
Unaffected: 0 , < 4.17 (semver)
Unaffected: 5.4.300 , ≤ 5.4.* (semver)
Unaffected: 5.10.245 , ≤ 5.10.* (semver)
Unaffected: 5.15.194 , ≤ 5.15.* (semver)
Unaffected: 6.1.155 , ≤ 6.1.* (semver)
Unaffected: 6.6.109 , ≤ 6.6.* (semver)
Unaffected: 6.12.50 , ≤ 6.12.* (semver)
Unaffected: 6.16.10 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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{
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          "product": "Linux",
          "programFiles": [
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        }
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              "value": "AV:L - The trigger is a `VIRTCHNL_OP_ADD_CLOUD_FILTER` message on the SR-IOV VF\u2192PF admin-queue mailbox, a PCIe transport rather than a network protocol. The attacker needs local control of an assigned VF \u2014 kernel/root inside a guest VM, or possession of the VFIO device \u2014 so reachability is local, not network or adjacent.\nAC:L - The attacker simply loops `VIRTCHNL_OP_ADD_CLOUD_FILTER` with a filter matching its own MAC; there is no duplicate check, no race, and no memory grooming, so growth is deterministic from the first message. The only precondition \u2014 ADq enabled with spoofchk off \u2014 is inherent to any ADq-capable SR-IOV deployment and is a standard runtime configuration.\nPR:L - Only the ability to drive the VF\u0027s admin queue is needed, which is a low-privileged position relative to the host PF driver under attack, and no host privileges of any kind are required. Notably `i40e_validate_cloud_filter()` accepts basic-mode filters from an untrusted VF, so even the trusted-VF bit is unnecessary.\nUI:N - The malicious VF drives the entire message flood on its own initiative. No host administrator or other user action is required at exploitation time.\nS:C - The attacking VF resides in a guest VM (or VF-assigned container) while the unbounded allocations, leaked memory, service-task starvation and hardware filter-table exhaustion all land in the host PF driver\u0027s security authority. The damage extends to the host and to every other VF sharing the adapter, crossing the guest/host and inter-tenant SR-IOV boundary.\nC:N - The defect is a missing upper bound on counted allocations; there is no out-of-bounds read, no uninitialized data returned, and the VF only ever receives an `aq_ret` status code. The `u16` counter wrap has no consumers, so no memory contents are exposed.\nI:L - Each successful add emits an unratelimited `dev_info()` from `i40e_add_del_cloud_filter()`, so a guest can push tens of thousands of lines through the host kernel log and roll away the host\u0027s diagnostic and audit records, and can also monopolize the PF-wide hardware cloud-filter table so the host\u0027s and other tenants\u0027 legitimate steering rules fail to install. The attacker has no control over which host data is displaced, so the modification is limited rather than arbitrary.\nA:H - A guest can allocate `struct i40e_cloud_filter` objects without limit until the host OOMs, and because `i40e_free_vf_res()`/`i40e_free_vfs()` never walk `vf-\u003ecloud_filter_list`, the memory is permanently leaked across every VF reset and SR-IOV teardown. The flood also monopolizes the PF\u0027s single service-task workqueue with synchronous firmware AQ round-trips, stalling watchdog, link and reset handling and taking host networking \u2014 and thus every guest on the adapter \u2014 down with it."
            }
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        }
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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    "datePublished": "2025-10-15T07:55:52.272Z",
    "dateReserved": "2025-04-16T07:20:57.149Z",
    "dateUpdated": "2026-08-05T12:06:37.397Z",
    "state": "PUBLISHED"
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      "version": "1"
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        "id": "CVE-2025-39968",
        "lastModified": "2026-07-30T06:24:02.520",
        "metrics": {
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                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
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                "baseSeverity": "HIGH",
                "confidentialityImpact": "NONE",
                "integrityImpact": "LOW",
                "privilegesRequired": "LOW",
                "scope": "CHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:H",
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              "type": "Secondary"
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        "published": "2025-10-15T08:15:34.350",
        "references": [
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
      }
    },
    "redhat_vex": {
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      "current_release_date": "2026-07-30T08:53:49+00:00",
      "cve": "CVE-2025-39968",
      "id": "CVE-2025-39968",
      "initial_release_date": "2025-10-15T00:00:00+00:00",
      "product_status:known_affected": "260",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel i40e: Resource exhaustion via unbounded VF filter requests",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-39968.json",
      "version": "3"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.