CVE-2025-40328 (GCVE-0-2025-40328)

Vulnerability from cvelistv5 – Published: 2025-12-09 04:09 – Updated: 2025-12-09 04:09
VLAI?
Title
smb: client: fix potential UAF in smb2_close_cached_fid()
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: ebe98f1447bbccf8228335c62d86af02a0ed23f7 , < cb52d9c86d70298de0ab7c7953653898cbc0efd6 (git)
Affected: ebe98f1447bbccf8228335c62d86af02a0ed23f7 , < 065bd62412271a2d734810dd50336cae88c54427 (git)
Affected: ebe98f1447bbccf8228335c62d86af02a0ed23f7 , < bdb596ceb4b7c3f28786a33840263728217fbcf5 (git)
Affected: ebe98f1447bbccf8228335c62d86af02a0ed23f7 , < 734e99623c5b65bf2c03e35978a0b980ebc3c2f8 (git)
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    Linux Linux Affected: 6.1
Unaffected: 0 , < 6.1 (semver)
Unaffected: 6.6.117 , ≤ 6.6.* (semver)
Unaffected: 6.12.58 , ≤ 6.12.* (semver)
Unaffected: 6.17.8 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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        {
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          "product": "Linux",
          "programFiles": [
            "fs/smb/client/cached_dir.c"
          ],
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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        }
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      "cpeApplicability": [
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          "nodes": [
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                }
              ],
              "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": [
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          "url": "https://git.kernel.org/stable/c/cb52d9c86d70298de0ab7c7953653898cbc0efd6"
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          "url": "https://git.kernel.org/stable/c/734e99623c5b65bf2c03e35978a0b980ebc3c2f8"
        }
      ],
      "title": "smb: client: fix potential UAF in smb2_close_cached_fid()",
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  "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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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • 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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