CVE-2025-71143 (GCVE-0-2025-71143)

Vulnerability from cvelistv5 – Published: 2026-01-14 15:07 – Updated: 2026-05-11 21:55
VLAI
Title
clk: samsung: exynos-clkout: Assign .num before accessing .hws
Summary
In the Linux kernel, the following vulnerability has been resolved: clk: samsung: exynos-clkout: Assign .num before accessing .hws Commit f316cdff8d67 ("clk: Annotate struct clk_hw_onecell_data with __counted_by") annotated the hws member of 'struct clk_hw_onecell_data' with __counted_by, which informs the bounds sanitizer (UBSAN_BOUNDS) about the number of elements in .hws[], so that it can warn when .hws[] is accessed out of bounds. As noted in that change, the __counted_by member must be initialized with the number of elements before the first array access happens, otherwise there will be a warning from each access prior to the initialization because the number of elements is zero. This occurs in exynos_clkout_probe() due to .num being assigned after .hws[] has been accessed: UBSAN: array-index-out-of-bounds in drivers/clk/samsung/clk-exynos-clkout.c:178:18 index 0 is out of range for type 'clk_hw *[*]' Move the .num initialization to before the first access of .hws[], clearing up the warning.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7056 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: f316cdff8d677db9ad9c90acb44c4cd535b0ee27 , < fbf57f5e453dadadb3d29b2d1dbe067e3dc4e236 (git)
Affected: f316cdff8d677db9ad9c90acb44c4cd535b0ee27 , < eb1f3a6ab3efee2b52361879cdc2dc6b11f499c0 (git)
Affected: f316cdff8d677db9ad9c90acb44c4cd535b0ee27 , < a317f63255ebc3dac378c79c5bff4f8d0561c290 (git)
Affected: f316cdff8d677db9ad9c90acb44c4cd535b0ee27 , < cf33f0b7df13685234ccea7be7bfe316b60db4db (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.6
Unaffected: 0 , < 6.6 (semver)
Unaffected: 6.6.120 , ≤ 6.6.* (semver)
Unaffected: 6.12.64 , ≤ 6.12.* (semver)
Unaffected: 6.18.4 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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    "dateUpdated": "2026-05-11T21:55:48.662Z",
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            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nclk: samsung: exynos-clkout: Assign .num before accessing .hws\n\nCommit f316cdff8d67 (\"clk: Annotate struct clk_hw_onecell_data with\n__counted_by\") annotated the hws member of \u0027struct clk_hw_onecell_data\u0027\nwith __counted_by, which informs the bounds sanitizer (UBSAN_BOUNDS)\nabout the number of elements in .hws[], so that it can warn when .hws[]\nis accessed out of bounds. As noted in that change, the __counted_by\nmember must be initialized with the number of elements before the first\narray access happens, otherwise there will be a warning from each access\nprior to the initialization because the number of elements is zero. This\noccurs in exynos_clkout_probe() due to .num being assigned after .hws[]\nhas been accessed:\n\n  UBSAN: array-index-out-of-bounds in drivers/clk/samsung/clk-exynos-clkout.c:178:18\n  index 0 is out of range for type \u0027clk_hw *[*]\u0027\n\nMove the .num initialization to before the first access of .hws[],\nclearing up the warning."
          },
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            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nclk: samsung: exynos-clkout: Asignar .num antes de acceder a .hws\n\nEl commit f316cdff8d67 (\u0027clk: Anotar struct clk_hw_onecell_data con __counted_by\u0027) anot\u00f3 el miembro hws de \u0027struct clk_hw_onecell_data\u0027 con __counted_by, lo que informa al sanitizador de l\u00edmites (UBSAN_BOUNDS) sobre el n\u00famero de elementos en .hws[], para que pueda advertir cuando se accede a .hws[] fuera de los l\u00edmites. Como se se\u00f1al\u00f3 en ese cambio, el miembro __counted_by debe inicializarse con el n\u00famero de elementos antes de que ocurra el primer acceso al array, de lo contrario, habr\u00e1 una advertencia de cada acceso anterior a la inicializaci\u00f3n porque el n\u00famero de elementos es cero. Esto ocurre en exynos_clkout_probe() debido a que .num se asigna despu\u00e9s de que se haya accedido a .hws[]:\n\n  UBSAN: array-index-out-of-bounds en drivers/clk/samsung/clk-exynos-clkout.c:178:18\n  el \u00edndice 0 est\u00e1 fuera de rango para el tipo \u0027clk_hw *[*]\u0027\n\nMover la inicializaci\u00f3n de .num a antes del primer acceso a .hws[], eliminando la advertencia."
          }
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        "id": "CVE-2025-71143",
        "lastModified": "2026-06-17T10:03:45.050",
        "metrics": {
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            {
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                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
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              "exploitabilityScore": 1.8,
              "impactScore": 5.9,
              "source": "nvd@nist.gov",
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        "vulnStatus": "Analyzed",
        "weaknesses": [
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                "lang": "en",
                "value": "CWE-129"
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            "source": "nvd@nist.gov",
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    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-28T11:45:17+00:00",
      "cve": "CVE-2025-71143",
      "id": "CVE-2025-71143",
      "initial_release_date": "2025-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: clk: samsung: exynos-clkout: Assign .num before accessing .hws",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-71143.json",
      "version": "3"
    }
  }
}



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