CVE-2025-22038 (GCVE-0-2025-22038)
Vulnerability from cvelistv5 – Published: 2025-04-16 14:11 – Updated: 2026-08-05 11:56
VLAI
EPSS
VEX
Title
ksmbd: validate zero num_subauth before sub_auth is accessed
Summary
In the Linux kernel, the following vulnerability has been resolved:
ksmbd: validate zero num_subauth before sub_auth is accessed
Access psid->sub_auth[psid->num_subauth - 1] without checking
if num_subauth is non-zero leads to an out-of-bounds read.
This patch adds a validation step to ensure num_subauth != 0
before sub_auth is accessed.
Severity
8.3 (High)
7.1 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-10-01 18:13 UTC
CWE
- CWE-125 - Out-of-bounds Read
Assigner
References
7 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
0626e6641f6b467447c81dd7678a69c66f7746cf , < 3ac65de111c686c95316ade660f8ba7aea3cd3cc
(git)
Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < 0e36a3e080d6d8bd7a34e089345d043da4ac8283 (git) Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < 56de7778a48560278c334077ace7b9ac4bfb2fd1 (git) Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < 68c6c3142bfcdb049839d40a9a59ebe8ea865002 (git) Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < c8bfe1954a0b89e7b29b3a3e7f4c5e0ebd295e20 (git) Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < bf21e29d78cd2c2371023953d9c82dfef82ebb36 (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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"url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-125"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
},
{
"description": [
{
"lang": "en",
"value": "CWE-125"
}
],
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"type": "Secondary"
}
]
}
},
"redhat_vex": {
"aggregate_severity": "Important",
"current_release_date": "2026-07-30T09:10:59+00:00",
"cve": "CVE-2025-22038",
"id": "CVE-2025-22038",
"initial_release_date": "2025-04-16T00:00:00+00:00",
"product_status:known_not_affected": "274",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: ksmbd: validate zero num_subauth before sub_auth is accessed",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-22038.json",
"version": "3"
},
"vulnrichment": {
"containers": {
"adp": [
{
"providerMetadata": {
"dateUpdated": "2025-11-03T19:41:20.321Z",
"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": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.1,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2025-22038",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2025-10-01T18:13:11.878668Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-125",
"description": "CWE-125 Out-of-bounds Read",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2025-10-01T14:40:34.717Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"fs/smb/server/smbacl.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "3ac65de111c686c95316ade660f8ba7aea3cd3cc",
"status": "affected",
"version": "0626e6641f6b467447c81dd7678a69c66f7746cf",
"versionType": "git"
},
{
"lessThan": "0e36a3e080d6d8bd7a34e089345d043da4ac8283",
"status": "affected",
"version": "0626e6641f6b467447c81dd7678a69c66f7746cf",
"versionType": "git"
},
{
"lessThan": "56de7778a48560278c334077ace7b9ac4bfb2fd1",
"status": "affected",
"version": "0626e6641f6b467447c81dd7678a69c66f7746cf",
"versionType": "git"
},
{
"lessThan": "68c6c3142bfcdb049839d40a9a59ebe8ea865002",
"status": "affected",
"version": "0626e6641f6b467447c81dd7678a69c66f7746cf",
"versionType": "git"
},
{
"lessThan": "c8bfe1954a0b89e7b29b3a3e7f4c5e0ebd295e20",
"status": "affected",
"version": "0626e6641f6b467447c81dd7678a69c66f7746cf",
"versionType": "git"
},
{
"lessThan": "bf21e29d78cd2c2371023953d9c82dfef82ebb36",
"status": "affected",
"version": "0626e6641f6b467447c81dd7678a69c66f7746cf",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"fs/smb/server/smbacl.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": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.134",
"versionStartIncluding": "5.15",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.87",
"versionStartIncluding": "5.15",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.23",
"versionStartIncluding": "5.15",
"vulnerable": true
},
{
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"versionEndExcluding": "6.13.11",
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"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.14.2",
"versionStartIncluding": "5.15",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.15",
"versionStartIncluding": "5.15",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: validate zero num_subauth before sub_auth is accessed\n\nAccess psid-\u003esub_auth[psid-\u003enum_subauth - 1] without checking\nif num_subauth is non-zero leads to an out-of-bounds read.\nThis patch adds a validation step to ensure num_subauth != 0\nbefore sub_auth is accessed."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 8.3,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:N - ksmbd is the in-kernel SMB server listening on TCP/445, and the malformed security descriptor is delivered entirely inside an SMB2 SET_INFO or CREATE request from a remote peer. No local access is required.\nAC:L - The attacker simply emits one SMB2 request containing an owner or group SID with num_subauth=0; parse_sid() explicitly permits that encoding and sid_to_id() is reached deterministically with no race, memory-layout, or timing dependency.\nPR:L - Both reachable paths require a completed SMB2 SESSION_SETUP, a writable TREE_CONNECT, and (for SET_INFO) an open file handle, so an ordinary authenticated share user is needed. This is not a pre-authentication path, but no administrative rights are required.\nUI:N - The attacker drives the entire sequence \u2014 session setup, tree connect, open, and the crafted set-security-descriptor request. No action by any local user or administrator is involved.\nS:U - The faulty read and its consequences stay inside the kernel\u0027s own security authority; there is no VM, IOMMU, or sandbox boundary crossed.\nC:H - sid_to_id() reads memory preceding the declared sub_auth[] array and the resulting value is committed as the file\u0027s owner uid/gid, which the attacker can read straight back through an SMB2 QUERY_INFO security-descriptor request \u2014 a repeatable, remotely-observable disclosure oracle over out-of-bounds-indexed kernel buffer contents.\nI:L - A zero-subauth SID that the code intends to reject (the fix returns -EIO) is instead accepted, so notify_change() applies a uid/gid synthesized from misinterpreted bytes \u2014 an unintended modification of file ownership metadata, but not an arbitrary write or control-flow hijack.\nA:H - The negative-index dereference is an unchecked read outside the intended array bounds; on hardened or KASAN-enabled builds this is a fatal report, and the resulting bogus uid/gid chown corrupts share state. Any such kernel-side out-of-bounds access is treated as crash-capable."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T11:56:11.103Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
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},
{
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},
{
"url": "https://git.kernel.org/stable/c/56de7778a48560278c334077ace7b9ac4bfb2fd1"
},
{
"url": "https://git.kernel.org/stable/c/68c6c3142bfcdb049839d40a9a59ebe8ea865002"
},
{
"url": "https://git.kernel.org/stable/c/c8bfe1954a0b89e7b29b3a3e7f4c5e0ebd295e20"
},
{
"url": "https://git.kernel.org/stable/c/bf21e29d78cd2c2371023953d9c82dfef82ebb36"
}
],
"title": "ksmbd: validate zero num_subauth before sub_auth is accessed",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2025-22038",
"datePublished": "2025-04-16T14:11:56.316Z",
"dateReserved": "2024-12-29T08:45:45.809Z",
"dateUpdated": "2026-08-05T11:56:11.103Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
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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.