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        "category": "legal_disclaimer",
        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.",
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        "summary": "Canonical URL",
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          "date": "2025-01-01T00:00:00Z",
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          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmack: /smack/doi: accept previously used values\n\nWriting to /smack/doi a value that has ever been\nwritten there in the past disables networking for\nnon-ambient labels.\nE.g.\n\n    # cat /smack/doi\n    3\n    # netlabelctl -p cipso list\n    Configured CIPSO mappings (1)\n     DOI value : 3\n       mapping type : PASS_THROUGH\n    # netlabelctl -p map list\n    Configured NetLabel domain mappings (3)\n     domain: \"_\" (IPv4)\n       protocol: UNLABELED\n     domain: DEFAULT (IPv4)\n       protocol: CIPSO, DOI = 3\n     domain: DEFAULT (IPv6)\n       protocol: UNLABELED\n\n    # cat /smack/ambient\n    _\n    # cat /proc/$$/attr/smack/current\n    _\n    # ping -c1 10.1.95.12\n    64 bytes from 10.1.95.12: icmp_seq=1 ttl=64 time=0.964 ms\n    # echo foo >/proc/$$/attr/smack/current\n    # ping -c1 10.1.95.12\n    64 bytes from 10.1.95.12: icmp_seq=1 ttl=64 time=0.956 ms\n    unknown option 86\n\n    # echo 4 >/smack/doi\n    # echo 3 >/smack/doi\n!>  [  214.050395] smk_cipso_doi:691 cipso add rc = -17\n    # echo 3 >/smack/doi\n!>  [  249.402261] smk_cipso_doi:678 remove rc = -2\n!>  [  249.402261] smk_cipso_doi:691 cipso add rc = -17\n\n    # ping -c1 10.1.95.12\n!!> ping: 10.1.95.12: Address family for hostname not supported\n\n    # echo _ >/proc/$$/attr/smack/current\n    # ping -c1 10.1.95.12\n    64 bytes from 10.1.95.12: icmp_seq=1 ttl=64 time=0.617 ms\n\nThis happens because Smack keeps decommissioned DOIs,\nfails to re-add them, and consequently refuses to add\nthe “default” domain map:\n\n    # netlabelctl -p cipso list\n    Configured CIPSO mappings (2)\n     DOI value : 3\n       mapping type : PASS_THROUGH\n     DOI value : 4\n       mapping type : PASS_THROUGH\n    # netlabelctl -p map list\n    Configured NetLabel domain mappings (2)\n     domain: \"_\" (IPv4)\n       protocol: UNLABELED\n!>  (no ipv4 map for default domain here)\n     domain: DEFAULT (IPv6)\n       protocol: UNLABELED\n\nFix by clearing decommissioned DOI definitions and\nserializing concurrent DOI updates with a new lock.\n\nAlso:\n- allow /smack/doi to live unconfigured, since\n  adding a map (netlbl_cfg_cipsov4_map_add) may fail.\n  CIPSO_V4_DOI_UNKNOWN(0) indicates the unconfigured DOI\n- add new DOI before removing the old default map,\n  so the old map remains if the add fails\n\n(2008-02-04, Casey Schaufler)",
          "title": "Vulnerability description"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
        "known_affected": [
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          "Debian-10:hyperv-daemons-0:4.19.325-1.amd64",
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          "Debian-10:linux-support-4.19.0-28-0:4.19.325-1.all"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2025-71304"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/199452f22d2f74b897fe826f81ec402b0a8461a0",
          "url": "https://git.kernel.org/stable/c/199452f22d2f74b897fe826f81ec402b0a8461a0"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/1c7ee23dfcd18d80770d8f90f2ab5bb1b2bfd8a3",
          "url": "https://git.kernel.org/stable/c/1c7ee23dfcd18d80770d8f90f2ab5bb1b2bfd8a3"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/33d589ed60ae433b483761987b85e0d24e54584e",
          "url": "https://git.kernel.org/stable/c/33d589ed60ae433b483761987b85e0d24e54584e"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/5a247a84de0ba44edbbd6be851c8a6b2aa60ff85",
          "url": "https://git.kernel.org/stable/c/5a247a84de0ba44edbbd6be851c8a6b2aa60ff85"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/6ec091c5c7eeabd249a7c46813cad1e9f555f859",
          "url": "https://git.kernel.org/stable/c/6ec091c5c7eeabd249a7c46813cad1e9f555f859"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/8beebb8ad9a003f978e53b06237986588223e15e",
          "url": "https://git.kernel.org/stable/c/8beebb8ad9a003f978e53b06237986588223e15e"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/eb718a3c8181ada679340db34cd61bce48e44749",
          "url": "https://git.kernel.org/stable/c/eb718a3c8181ada679340db34cd61bce48e44749"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/f8071500177f38cff38892bd85ac631cc6e010b2",
          "url": "https://git.kernel.org/stable/c/f8071500177f38cff38892bd85ac631cc6e010b2"
        }
      ],
      "release_date": "2026-05-27T14:16:00Z",
      "remediations": [
        {
          "category": "no_fix_planned",
          "date": "2026-07-24T15:29:29.566028Z",
          "details": "This issue is only reachable on systems that actively enable Smack and NetLabel/CIPSO, and it requires a local process with administrative capability (CAP_MAC_ADMIN) to write to the smackfs DOI control. Even when triggered, the impact is availability-only (it disrupts networking for non-ambient Smack labels) with no confidentiality or integrity effect, while unlabeled/ambient traffic continues to work. On hosts where Smack/CIPSO is not enabled—which is the default on general-purpose enterprise Linux deployments—the vulnerable path is absent, so this can be safely deprioritized.",
          "product_ids": [
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            "Debian-10:libbpf-dev-0:4.19.325-1+tuxcare.els1.amd64",
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          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 5.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
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      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ]
    }
  ]
}