CVE-2025-38570 (GCVE-0-2025-38570)

Vulnerability from cvelistv5 – Published: 2025-08-19 17:02 – Updated: 2026-08-05 12:02
VLAI
Title
eth: fbnic: unlink NAPIs from queues on error to open
Summary
In the Linux kernel, the following vulnerability has been resolved: eth: fbnic: unlink NAPIs from queues on error to open CI hit a UaF in fbnic in the AF_XDP portion of the queues.py test. The UaF is in the __sk_mark_napi_id_once() call in xsk_bind(), NAPI has been freed. Looks like the device failed to open earlier, and we lack clearing the NAPI pointer from the queue.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 557d02238e05eb66b9aba9a1f90f3a2131c6c887 , < 21d3f8441c7f317b93ba6a8029610c8b7e3773db (git)
Affected: 557d02238e05eb66b9aba9a1f90f3a2131c6c887 , < 4b59f9deff3bdb52b223c85048f1d2924803b817 (git)
Affected: 557d02238e05eb66b9aba9a1f90f3a2131c6c887 , < 4b31bcb025cb497da2b01f87173108ff32d350d2 (git)
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Linux Linux Affected: 6.14
Unaffected: 0 , < 6.14 (semver)
Unaffected: 6.15.10 , ≤ 6.15.* (semver)
Unaffected: 6.16.1 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/meta/fbnic/fbnic_netdev.c"
          ],
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              "versionType": "semver"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\neth: fbnic: unlink NAPIs from queues on error to open\n\nCI hit a UaF in fbnic in the AF_XDP portion of the queues.py test.\nThe UaF is in the __sk_mark_napi_id_once() call in xsk_bind(),\nNAPI has been freed. Looks like the device failed to open earlier,\nand we lack clearing the NAPI pointer from the queue."
        }
      ],
      "metrics": [
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          "cvssV3_1": {
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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              "lang": "en",
              "value": "AV:L - The dangling NAPI pointer is created by a local netdev administrative operation (link up) and dereferenced through local syscalls \u2014 `bind()` on an AF_XDP socket or a netdev-genl queue query. No remote peer data reaches this code path.\nAC:L - Once the failed open leaves the pointers dangling, the UAF is a persistent state rather than a race window, and `xsk_bind()` with `XDP_COPY` reaches `rxq-\u003enapi-\u003enapi_id` deterministically on the down device for every queue index, repeatable at will. The open failure itself is attacker-influenceable (`-ENOMEM` in `fbnic_tlv_msg_alloc()`/`request_irq()` under attacker-generated memory pressure, or an unready FW mailbox) and link-up can be retried indefinitely.\nPR:L - Both required capabilities are namespaced \u2014 `ns_capable(net-\u003euser_ns, CAP_NET_ADMIN)` for RTM_SETLINK link-up and `ns_capable(net-\u003euser_ns, CAP_NET_RAW)` for AF_XDP socket creation \u2014 so an unprivileged user in a user-namespace-owned netns with the NIC delegated (container/passthrough deployments) can perform the whole sequence without real root.\nUI:N - The attacker performs both the link-up that fails and the subsequent AF_XDP bind; no action by any other user or victim process is needed.\nS:U - The freed object and the corrupted pointers both live in kernel memory under the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - This is a use-after-free read of a freed `fbnic_napi_vector` slab object, and the attacker can spray the freed allocation before triggering the read; the value is then exfiltrated to userspace via `getsockopt(SO_INCOMING_NAPI_ID)`, giving a repeatable read primitive over reclaimed kernel heap.\nI:H - Stale `struct napi_struct *` pointers persist in the netdev\u0027s rx and tx queue structures after the backing allocation is freed; per UAF treatment this heap-reuse condition is exploitable for controlling reclaimed object contents and hijacking dependent state.\nA:H - Dereferencing the freed vector \u2014 potentially after the slab page has been returned to the page allocator \u2014 produces an oops or panic, and the condition can be re-triggered against every queue index on the affected interface."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:02:58.557Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/21d3f8441c7f317b93ba6a8029610c8b7e3773db"
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          "url": "https://git.kernel.org/stable/c/4b59f9deff3bdb52b223c85048f1d2924803b817"
        },
        {
          "url": "https://git.kernel.org/stable/c/4b31bcb025cb497da2b01f87173108ff32d350d2"
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      ],
      "title": "eth: fbnic: unlink NAPIs from queues on error to open",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38570",
    "datePublished": "2025-08-19T17:02:50.677Z",
    "dateReserved": "2025-04-16T04:51:24.025Z",
    "dateUpdated": "2026-08-05T12:02:58.557Z",
    "state": "PUBLISHED"
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    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-30T10:23:30+00:00",
      "cve": "CVE-2025-38570",
      "id": "CVE-2025-38570",
      "initial_release_date": "2025-08-19T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: eth: fbnic: unlink NAPIs from queues on error to open",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-38570.json",
      "version": "3"
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    "suse_vex": {
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      "current_release_date": "2026-07-31T01:08:31Z",
      "cve": "CVE-2025-38570",
      "id": "CVE-2025-38570",
      "initial_release_date": "2025-08-19T23:23:43Z",
      "product_status:known_not_affected": "416",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-38570",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-38570.json",
      "version": "6"
    }
  }
}



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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.