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

Vulnerability from cvelistv5 – Published: 2026-01-14 15:07 – Updated: 2026-01-14 15:07
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 ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: f316cdff8d677db9ad9c90acb44c4cd535b0ee27 , < fbf57f5e453dadadb3d29b2d1dbe067e3dc4e236 (git)
Affected: f316cdff8d677db9ad9c90acb44c4cd535b0ee27 , < eb1f3a6ab3efee2b52361879cdc2dc6b11f499c0 (git)
Affected: f316cdff8d677db9ad9c90acb44c4cd535b0ee27 , < a317f63255ebc3dac378c79c5bff4f8d0561c290 (git)
Affected: f316cdff8d677db9ad9c90acb44c4cd535b0ee27 , < cf33f0b7df13685234ccea7be7bfe316b60db4db (git)
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    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-rc1 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/clk/samsung/clk-exynos-clkout.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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              "versionType": "git"
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        {
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          "product": "Linux",
          "programFiles": [
            "drivers/clk/samsung/clk-exynos-clkout.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "6.6"
            },
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.120",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.64",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.19-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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          "nodes": [
            {
              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.120",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.64",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.4",
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                },
                {
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                  "versionEndExcluding": "6.19-rc1",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-01-14T15:07:55.828Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/fbf57f5e453dadadb3d29b2d1dbe067e3dc4e236"
        },
        {
          "url": "https://git.kernel.org/stable/c/eb1f3a6ab3efee2b52361879cdc2dc6b11f499c0"
        },
        {
          "url": "https://git.kernel.org/stable/c/a317f63255ebc3dac378c79c5bff4f8d0561c290"
        },
        {
          "url": "https://git.kernel.org/stable/c/cf33f0b7df13685234ccea7be7bfe316b60db4db"
        }
      ],
      "title": "clk: samsung: exynos-clkout: Assign .num before accessing .hws",
      "x_generator": {
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      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-71143",
    "datePublished": "2026-01-14T15:07:55.828Z",
    "dateReserved": "2026-01-13T15:30:19.661Z",
    "dateUpdated": "2026-01-14T15:07:55.828Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-71143\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-01-14T15:16:04.113\",\"lastModified\":\"2026-01-14T16:25:12.057\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"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.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/a317f63255ebc3dac378c79c5bff4f8d0561c290\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cf33f0b7df13685234ccea7be7bfe316b60db4db\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/eb1f3a6ab3efee2b52361879cdc2dc6b11f499c0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fbf57f5e453dadadb3d29b2d1dbe067e3dc4e236\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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  • 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.
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