CVE-2025-40103 (GCVE-0-2025-40103)

Vulnerability from cvelistv5 – Published: 2025-10-30 09:48 – Updated: 2025-12-01 06:18
VLAI?
Summary
In the Linux kernel, the following vulnerability has been resolved: smb: client: Fix refcount leak for cifs_sb_tlink Fix three refcount inconsistency issues related to `cifs_sb_tlink`. Comments for `cifs_sb_tlink` state that `cifs_put_tlink()` needs to be called after successful calls to `cifs_sb_tlink()`. Three calls fail to update refcount accordingly, leading to possible resource leaks.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 8ceb984379462f94bdebef3288d569c6e1f912ea , < 790282abe9d805f08618c1c24ea2529e7259b692 (git)
Affected: 8ceb984379462f94bdebef3288d569c6e1f912ea , < d7dd034c14928306db1b46be277ae439b84dacf9 (git)
Affected: 8ceb984379462f94bdebef3288d569c6e1f912ea , < e15605b68b490186da2ad8029c0351a9cfb0b9af (git)
Affected: 8ceb984379462f94bdebef3288d569c6e1f912ea , < 896bb31e1416f582503db1350cf1bd10dc64e5a6 (git)
Affected: 8ceb984379462f94bdebef3288d569c6e1f912ea , < c2b77f42205ef485a647f62082c442c1cd69d3fc (git)
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    Linux Linux Affected: 3.7
Unaffected: 0 , < 3.7 (semver)
Unaffected: 6.1.158 , ≤ 6.1.* (semver)
Unaffected: 6.6.114 , ≤ 6.6.* (semver)
Unaffected: 6.12.55 , ≤ 6.12.* (semver)
Unaffected: 6.17.5 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
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{
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/client/inode.c",
            "fs/smb/client/smb2ops.c"
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          "vendor": "Linux",
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            {
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              "status": "unaffected",
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              "lessThanOrEqual": "6.17.*",
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              "versionType": "semver"
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            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18",
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      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "negate": false,
              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: Fix refcount leak for cifs_sb_tlink\n\nFix three refcount inconsistency issues related to `cifs_sb_tlink`.\n\nComments for `cifs_sb_tlink` state that `cifs_put_tlink()` needs to be\ncalled after successful calls to `cifs_sb_tlink()`. Three calls fail to\nupdate refcount accordingly, leading to possible resource leaks."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-01T06:18:06.031Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/790282abe9d805f08618c1c24ea2529e7259b692"
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        },
        {
          "url": "https://git.kernel.org/stable/c/c2b77f42205ef485a647f62082c442c1cd69d3fc"
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      ],
      "title": "smb: client: Fix refcount leak for cifs_sb_tlink",
      "x_generator": {
        "engine": "bippy-1.2.0"
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  },
  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40103",
    "datePublished": "2025-10-30T09:48:08.421Z",
    "dateReserved": "2025-04-16T07:20:57.164Z",
    "dateUpdated": "2025-12-01T06:18:06.031Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
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  "vulnerability-lookup:meta": {
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  }
}


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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.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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