CVE-2025-38306 (GCVE-0-2025-38306)
Vulnerability from cvelistv5
Published
2025-07-10 07:42
Modified
2025-09-09 17:06
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: fs/fhandle.c: fix a race in call of has_locked_children() may_decode_fh() is calling has_locked_children() while holding no locks. That's an oopsable race... The rest of the callers are safe since they are holding namespace_sem and are guaranteed a positive refcount on the mount in question. Rename the current has_locked_children() to __has_locked_children(), make it static and switch the fs/namespace.c users to it. Make has_locked_children() a wrapper for __has_locked_children(), calling the latter under read_seqlock_excl(&mount_lock).
References
Impacted products
Vendor Product Version
Linux Linux Version: 620c266f394932e5decc4b34683a75dfc59dc2f4
Version: 620c266f394932e5decc4b34683a75dfc59dc2f4
Version: 620c266f394932e5decc4b34683a75dfc59dc2f4
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/namespace.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
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              "versionType": "git"
            },
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              "status": "affected",
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          ]
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        {
          "defaultStatus": "affected",
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          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.11"
            },
            {
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.46",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.15.*",
              "status": "unaffected",
              "version": "6.15.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.16",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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          "nodes": [
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                  "versionStartIncluding": "6.11",
                  "vulnerable": true
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                  "vulnerable": true
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                  "versionEndExcluding": "6.16",
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                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/fhandle.c: fix a race in call of has_locked_children()\n\nmay_decode_fh() is calling has_locked_children() while holding no locks.\nThat\u0027s an oopsable race...\n\nThe rest of the callers are safe since they are holding namespace_sem and\nare guaranteed a positive refcount on the mount in question.\n\nRename the current has_locked_children() to __has_locked_children(), make\nit static and switch the fs/namespace.c users to it.\n\nMake has_locked_children() a wrapper for __has_locked_children(), calling\nthe latter under read_seqlock_excl(\u0026mount_lock)."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-09-09T17:06:11.491Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/6482c3dccbfb8d20e2856ce67c75856859930b3f"
        },
        {
          "url": "https://git.kernel.org/stable/c/287c7d34eedd37af1272dfb3b6e8656f4f026424"
        },
        {
          "url": "https://git.kernel.org/stable/c/1f282cdc1d219c4a557f7009e81bc792820d9d9a"
        }
      ],
      "title": "fs/fhandle.c: fix a race in call of has_locked_children()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38306",
    "datePublished": "2025-07-10T07:42:16.806Z",
    "dateReserved": "2025-04-16T04:51:24.002Z",
    "dateUpdated": "2025-09-09T17:06:11.491Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38306\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-07-10T08:15:29.440\",\"lastModified\":\"2025-09-09T17:15:44.660\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nfs/fhandle.c: fix a race in call of has_locked_children()\\n\\nmay_decode_fh() is calling has_locked_children() while holding no locks.\\nThat\u0027s an oopsable race...\\n\\nThe rest of the callers are safe since they are holding namespace_sem and\\nare guaranteed a positive refcount on the mount in question.\\n\\nRename the current has_locked_children() to __has_locked_children(), make\\nit static and switch the fs/namespace.c users to it.\\n\\nMake has_locked_children() a wrapper for __has_locked_children(), calling\\nthe latter under read_seqlock_excl(\u0026mount_lock).\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: fs/fhandle.c: se corrige una ejecuci\u00f3n en la llamada a has_locked_children(). may_decode_fh() llama a has_locked_children() sin bloqueos. Esta es una ejecuci\u00f3n que puede fallar. El resto de los invocadores est\u00e1n seguros, ya que mantienen namespace_sem y se les garantiza un recuento de referencias positivo en el montaje en cuesti\u00f3n. Cambie el nombre de has_locked_children() actual a __has_locked_children(), convi\u00e9rtalo en est\u00e1tico y cambie los usuarios de fs/namespace.c a \u00e9l. Convierta has_locked_children() en un contenedor para __has_locked_children(), invoc\u00e1ndolo bajo read_seqlock_excl(\u0026amp;mount_lock).\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1f282cdc1d219c4a557f7009e81bc792820d9d9a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/287c7d34eedd37af1272dfb3b6e8656f4f026424\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6482c3dccbfb8d20e2856ce67c75856859930b3f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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