CVE-2025-40103 (GCVE-0-2025-40103)
Vulnerability from cvelistv5 – Published: 2025-10-30 09:48 – Updated: 2026-05-11 21:42
VLAI
EPSS
VEX
Title
smb: client: Fix refcount leak for cifs_sb_tlink
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
6 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
8ceb984379462f94bdebef3288d569c6e1f912ea , < d3c8ea197055c260119a13360e8202a27e53e1e4
(git)
Affected: 8ceb984379462f94bdebef3288d569c6e1f912ea , < 790282abe9d805f08618c1c24ea2529e7259b692 (git) Affected: 8ceb984379462f94bdebef3288d569c6e1f912ea , < d7dd034c14928306db1b46be277ae439b84dacf9 (git) Affected: 8ceb984379462f94bdebef3288d569c6e1f912ea , < e15605b68b490186da2ad8029c0351a9cfb0b9af (git) Affected: 8ceb984379462f94bdebef3288d569c6e1f912ea , < 896bb31e1416f582503db1350cf1bd10dc64e5a6 (git) Affected: 8ceb984379462f94bdebef3288d569c6e1f912ea , < c2b77f42205ef485a647f62082c442c1cd69d3fc (git) |
guessed | |
| Linux | Linux |
Affected:
3.7
Unaffected: 0 , < 3.7 (semver) Unaffected: 5.15.203 , ≤ 5.15.* (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) |
guessed |
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"fs/smb/client/inode.c",
"fs/smb/client/smb2ops.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "d3c8ea197055c260119a13360e8202a27e53e1e4",
"status": "affected",
"version": "8ceb984379462f94bdebef3288d569c6e1f912ea",
"versionType": "git"
},
{
"lessThan": "790282abe9d805f08618c1c24ea2529e7259b692",
"status": "affected",
"version": "8ceb984379462f94bdebef3288d569c6e1f912ea",
"versionType": "git"
},
{
"lessThan": "d7dd034c14928306db1b46be277ae439b84dacf9",
"status": "affected",
"version": "8ceb984379462f94bdebef3288d569c6e1f912ea",
"versionType": "git"
},
{
"lessThan": "e15605b68b490186da2ad8029c0351a9cfb0b9af",
"status": "affected",
"version": "8ceb984379462f94bdebef3288d569c6e1f912ea",
"versionType": "git"
},
{
"lessThan": "896bb31e1416f582503db1350cf1bd10dc64e5a6",
"status": "affected",
"version": "8ceb984379462f94bdebef3288d569c6e1f912ea",
"versionType": "git"
},
{
"lessThan": "c2b77f42205ef485a647f62082c442c1cd69d3fc",
"status": "affected",
"version": "8ceb984379462f94bdebef3288d569c6e1f912ea",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"fs/smb/client/inode.c",
"fs/smb/client/smb2ops.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "3.7"
},
{
"lessThan": "3.7",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.203",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.158",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.114",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.55",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.17.*",
"status": "unaffected",
"version": "6.17.5",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.18",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.203",
"versionStartIncluding": "3.7",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.158",
"versionStartIncluding": "3.7",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.114",
"versionStartIncluding": "3.7",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.55",
"versionStartIncluding": "3.7",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.17.5",
"versionStartIncluding": "3.7",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18",
"versionStartIncluding": "3.7",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"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": "2026-05-11T21:42:34.498Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/d3c8ea197055c260119a13360e8202a27e53e1e4"
},
{
"url": "https://git.kernel.org/stable/c/790282abe9d805f08618c1c24ea2529e7259b692"
},
{
"url": "https://git.kernel.org/stable/c/d7dd034c14928306db1b46be277ae439b84dacf9"
},
{
"url": "https://git.kernel.org/stable/c/e15605b68b490186da2ad8029c0351a9cfb0b9af"
},
{
"url": "https://git.kernel.org/stable/c/896bb31e1416f582503db1350cf1bd10dc64e5a6"
},
{
"url": "https://git.kernel.org/stable/c/c2b77f42205ef485a647f62082c442c1cd69d3fc"
}
],
"title": "smb: client: Fix refcount leak for cifs_sb_tlink",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2025-40103",
"datePublished": "2025-10-30T09:48:08.421Z",
"dateReserved": "2025-04-16T07:20:57.164Z",
"dateUpdated": "2026-05-11T21:42:34.498Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2025-40103",
"date": "2026-09-20",
"epss": "0.00193",
"percentile": "0.09217"
},
"microsoft_vex": {
"current_release_date": "2025-12-07T01:44:07.000Z",
"cve": "CVE-2025-40103",
"id": "msrc_CVE-2025-40103",
"initial_release_date": "2025-10-02T00:00:00.000Z",
"product_status:fixed": "1",
"product_status:known_affected": "2",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "smb: client: Fix refcount leak for cifs_sb_tlink",
"url": "https://msrc.microsoft.com/csaf/vex/2025/msrc_cve-2025-40103.json",
"version": "2"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"fs/smb/client/inode.c",
"fs/smb/client/smb2ops.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "d3c8ea197055c260119a13360e8202a27e53e1e4",
"status": "affected",
"version": "8ceb984379462f94bdebef3288d569c6e1f912ea",
"versionType": "git"
},
{
"lessThan": "790282abe9d805f08618c1c24ea2529e7259b692",
"status": "affected",
"version": "8ceb984379462f94bdebef3288d569c6e1f912ea",
"versionType": "git"
},
{
"lessThan": "d7dd034c14928306db1b46be277ae439b84dacf9",
"status": "affected",
"version": "8ceb984379462f94bdebef3288d569c6e1f912ea",
"versionType": "git"
},
{
"lessThan": "e15605b68b490186da2ad8029c0351a9cfb0b9af",
"status": "affected",
"version": "8ceb984379462f94bdebef3288d569c6e1f912ea",
"versionType": "git"
},
{
"lessThan": "896bb31e1416f582503db1350cf1bd10dc64e5a6",
"status": "affected",
"version": "8ceb984379462f94bdebef3288d569c6e1f912ea",
"versionType": "git"
},
{
"lessThan": "c2b77f42205ef485a647f62082c442c1cd69d3fc",
"status": "affected",
"version": "8ceb984379462f94bdebef3288d569c6e1f912ea",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"fs/smb/client/inode.c",
"fs/smb/client/smb2ops.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "3.7"
},
{
"lessThan": "3.7",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.203",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.158",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.114",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.55",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.17.*",
"status": "unaffected",
"version": "6.17.5",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.18",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"cveTags": [],
"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."
}
],
"id": "CVE-2025-40103",
"lastModified": "2026-06-17T09:21:16.167",
"metrics": {},
"published": "2025-10-30T10:15:34.693",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/790282abe9d805f08618c1c24ea2529e7259b692"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/896bb31e1416f582503db1350cf1bd10dc64e5a6"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/c2b77f42205ef485a647f62082c442c1cd69d3fc"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/d3c8ea197055c260119a13360e8202a27e53e1e4"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/d7dd034c14928306db1b46be277ae439b84dacf9"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/e15605b68b490186da2ad8029c0351a9cfb0b9af"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Deferred"
}
},
"redhat_vex": {
"aggregate_severity": "Low",
"current_release_date": "2026-06-30T10:20:48+00:00",
"cve": "CVE-2025-40103",
"id": "CVE-2025-40103",
"initial_release_date": "2025-10-30T00:00:00+00:00",
"product_status:known_affected": "232",
"product_status:known_not_affected": "42",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: smb: client: Fix refcount leak for cifs_sb_tlink",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-40103.json",
"version": "3"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- 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.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- 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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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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