CVE-2025-40328 (GCVE-0-2025-40328)
Vulnerability from cvelistv5
Published
2025-12-09 04:09
Modified
2025-12-09 04:09
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: smb: client: fix potential UAF in smb2_close_cached_fid() find_or_create_cached_dir() could grab a new reference after kref_put() had seen the refcount drop to zero but before cfid_list_lock is acquired in smb2_close_cached_fid(), leading to use-after-free. Switch to kref_put_lock() so cfid_release() is called with cfid_list_lock held, closing that gap.
References
Impacted products
Vendor Product Version
Linux Linux Version: ebe98f1447bbccf8228335c62d86af02a0ed23f7
Version: ebe98f1447bbccf8228335c62d86af02a0ed23f7
Version: ebe98f1447bbccf8228335c62d86af02a0ed23f7
Version: ebe98f1447bbccf8228335c62d86af02a0ed23f7
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/client/cached_dir.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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          "product": "Linux",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.1"
            },
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              "lessThan": "6.1",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.117",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.58",
              "versionType": "semver"
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            {
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              "status": "unaffected",
              "version": "6.17.8",
              "versionType": "semver"
            },
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              "version": "6.18",
              "versionType": "original_commit_for_fix"
            }
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        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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                  "vulnerable": true
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                  "vulnerable": true
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                  "versionEndExcluding": "6.18",
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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\nsmb: client: fix potential UAF in smb2_close_cached_fid()\n\nfind_or_create_cached_dir() could grab a new reference after kref_put()\nhad seen the refcount drop to zero but before cfid_list_lock is acquired\nin smb2_close_cached_fid(), leading to use-after-free.\n\nSwitch to kref_put_lock() so cfid_release() is called with\ncfid_list_lock held, closing that gap."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-09T04:09:44.876Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/cb52d9c86d70298de0ab7c7953653898cbc0efd6"
        },
        {
          "url": "https://git.kernel.org/stable/c/065bd62412271a2d734810dd50336cae88c54427"
        },
        {
          "url": "https://git.kernel.org/stable/c/bdb596ceb4b7c3f28786a33840263728217fbcf5"
        },
        {
          "url": "https://git.kernel.org/stable/c/734e99623c5b65bf2c03e35978a0b980ebc3c2f8"
        }
      ],
      "title": "smb: client: fix potential UAF in smb2_close_cached_fid()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40328",
    "datePublished": "2025-12-09T04:09:44.876Z",
    "dateReserved": "2025-04-16T07:20:57.186Z",
    "dateUpdated": "2025-12-09T04:09:44.876Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-40328\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-09T16:17:42.903\",\"lastModified\":\"2025-12-09T18:37:13.640\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nsmb: client: fix potential UAF in smb2_close_cached_fid()\\n\\nfind_or_create_cached_dir() could grab a new reference after kref_put()\\nhad seen the refcount drop to zero but before cfid_list_lock is acquired\\nin smb2_close_cached_fid(), leading to use-after-free.\\n\\nSwitch to kref_put_lock() so cfid_release() is called with\\ncfid_list_lock held, closing that gap.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/065bd62412271a2d734810dd50336cae88c54427\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/734e99623c5b65bf2c03e35978a0b980ebc3c2f8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bdb596ceb4b7c3f28786a33840263728217fbcf5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cb52d9c86d70298de0ab7c7953653898cbc0efd6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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