CVE-2025-22040 (GCVE-0-2025-22040)
Vulnerability from cvelistv5 – Published: 2025-04-16 14:11 – Updated: 2026-08-05 11:56
VLAI
EPSS
VEX
Title
ksmbd: fix session use-after-free in multichannel connection
Summary
In the Linux kernel, the following vulnerability has been resolved:
ksmbd: fix session use-after-free in multichannel connection
There is a race condition between session setup and
ksmbd_sessions_deregister. The session can be freed before the connection
is added to channel list of session.
This patch check reference count of session before freeing it.
Severity
8.8 (High)
7.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-04-21 14:57 UTC
CWE
- CWE-416 - Use After Free
Assigner
References
7 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
0626e6641f6b467447c81dd7678a69c66f7746cf , < 596407adb9af1ee75fe7c7529607783d31b66e7f
(git)
Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < 3980770cb1470054e6400fd97668665975726737 (git) Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < 9069939d762138e232a6f79e3e1462682ed6a17d (git) Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < 94c281721d4ed2d972232414b91d98a6f5bdb16b (git) Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < 7dfbd4c43eed91dd2548a95236908025707a8dfd (git) Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < fa4cdb8cbca7d6cb6aa13e4d8d83d1103f6345db (git) |
guessed | |
| Linux | Linux |
Affected:
5.15
Unaffected: 0 , < 5.15 (semver) Unaffected: 6.1.134 , ≤ 6.1.* (semver) Unaffected: 6.6.87 , ≤ 6.6.* (semver) Unaffected: 6.12.23 , ≤ 6.12.* (semver) Unaffected: 6.13.11 , ≤ 6.13.* (semver) Unaffected: 6.14.2 , ≤ 6.14.* (semver) Unaffected: 6.15 , ≤ * (original_commit_for_fix) |
guessed |
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},
"suse_vex": {
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"current_release_date": "2026-08-30T02:03:00Z",
"cve": "CVE-2025-22040",
"id": "CVE-2025-22040",
"initial_release_date": "2025-04-18T23:20:24Z",
"product_status:known_not_affected": "562",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2025-22040",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-22040.json",
"version": "9"
},
"vulnrichment": {
"containers": {
"adp": [
{
"providerMetadata": {
"dateUpdated": "2025-11-03T19:41:21.699Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
},
"references": [
{
"url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html"
}
],
"title": "CVE Program Container"
},
{
"metrics": [
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"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2025-22040",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2025-04-21T14:57:48.411411Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-416",
"description": "CWE-416 Use After Free",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2025-04-21T14:57:50.108Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
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"product": "Linux",
"programFiles": [
"fs/smb/server/auth.c",
"fs/smb/server/mgmt/user_session.c",
"fs/smb/server/smb2pdu.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"
},
{
"lessThan": "3980770cb1470054e6400fd97668665975726737",
"status": "affected",
"version": "0626e6641f6b467447c81dd7678a69c66f7746cf",
"versionType": "git"
},
{
"lessThan": "9069939d762138e232a6f79e3e1462682ed6a17d",
"status": "affected",
"version": "0626e6641f6b467447c81dd7678a69c66f7746cf",
"versionType": "git"
},
{
"lessThan": "94c281721d4ed2d972232414b91d98a6f5bdb16b",
"status": "affected",
"version": "0626e6641f6b467447c81dd7678a69c66f7746cf",
"versionType": "git"
},
{
"lessThan": "7dfbd4c43eed91dd2548a95236908025707a8dfd",
"status": "affected",
"version": "0626e6641f6b467447c81dd7678a69c66f7746cf",
"versionType": "git"
},
{
"lessThan": "fa4cdb8cbca7d6cb6aa13e4d8d83d1103f6345db",
"status": "affected",
"version": "0626e6641f6b467447c81dd7678a69c66f7746cf",
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}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"fs/smb/server/auth.c",
"fs/smb/server/mgmt/user_session.c",
"fs/smb/server/smb2pdu.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.15"
},
{
"lessThan": "5.15",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.134",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.87",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.23",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.13.*",
"status": "unaffected",
"version": "6.13.11",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.14.*",
"status": "unaffected",
"version": "6.14.2",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.15",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
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"versionStartIncluding": "5.15",
"vulnerable": true
},
{
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"versionEndExcluding": "6.6.87",
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"vulnerable": true
},
{
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"versionEndExcluding": "6.12.23",
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"vulnerable": true
},
{
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"vulnerable": true
},
{
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"versionEndExcluding": "6.14.2",
"versionStartIncluding": "5.15",
"vulnerable": true
},
{
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"versionEndExcluding": "6.15",
"versionStartIncluding": "5.15",
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}
],
"negate": false,
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}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix session use-after-free in multichannel connection\n\nThere is a race condition between session setup and\nksmbd_sessions_deregister. The session can be freed before the connection\nis added to channel list of session.\nThis patch check reference count of session before freeing it."
}
],
"metrics": [
{
"cvssV3_1": {
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"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-04-02T08:39:28.919Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
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},
{
"url": "https://git.kernel.org/stable/c/3980770cb1470054e6400fd97668665975726737"
},
{
"url": "https://git.kernel.org/stable/c/9069939d762138e232a6f79e3e1462682ed6a17d"
},
{
"url": "https://git.kernel.org/stable/c/94c281721d4ed2d972232414b91d98a6f5bdb16b"
},
{
"url": "https://git.kernel.org/stable/c/7dfbd4c43eed91dd2548a95236908025707a8dfd"
},
{
"url": "https://git.kernel.org/stable/c/fa4cdb8cbca7d6cb6aa13e4d8d83d1103f6345db"
}
],
"title": "ksmbd: fix session use-after-free in multichannel connection",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2025-22040",
"datePublished": "2025-04-16T14:11:57.601Z",
"dateReserved": "2024-12-29T08:45:45.809Z",
"dateUpdated": "2026-04-02T08:39:28.919Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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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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