{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/meta/fbnic/fbnic_netdev.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "21d3f8441c7f317b93ba6a8029610c8b7e3773db",
              "status": "affected",
              "version": "557d02238e05eb66b9aba9a1f90f3a2131c6c887",
              "versionType": "git"
            },
            {
              "lessThan": "4b59f9deff3bdb52b223c85048f1d2924803b817",
              "status": "affected",
              "version": "557d02238e05eb66b9aba9a1f90f3a2131c6c887",
              "versionType": "git"
            },
            {
              "lessThan": "4b31bcb025cb497da2b01f87173108ff32d350d2",
              "status": "affected",
              "version": "557d02238e05eb66b9aba9a1f90f3a2131c6c887",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/meta/fbnic/fbnic_netdev.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.14"
            },
            {
              "lessThan": "6.14",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.15.*",
              "status": "unaffected",
              "version": "6.15.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.16.*",
              "status": "unaffected",
              "version": "6.16.1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.17",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.15.10",
                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.16.1",
                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.17",
                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "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": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "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"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/21d3f8441c7f317b93ba6a8029610c8b7e3773db"
        },
        {
          "url": "https://git.kernel.org/stable/c/4b59f9deff3bdb52b223c85048f1d2924803b817"
        },
        {
          "url": "https://git.kernel.org/stable/c/4b31bcb025cb497da2b01f87173108ff32d350d2"
        }
      ],
      "title": "eth: fbnic: unlink NAPIs from queues on error to open",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "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"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}