FKIE_CVE-2025-40084
Vulnerability from fkie_nvd - Published: 2025-10-29 14:15 - Updated: 2026-10-19 21:10
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved:
ksmbd: transport_ipc: validate payload size before reading handle
handle_response() dereferences the payload as a 4-byte handle without
verifying that the declared payload size is at least 4 bytes. A malformed
or truncated message from ksmbd.mountd can lead to a 4-byte read past the
declared payload size. Validate the size before dereferencing.
This is a minimal fix to guard the initial handle read.
References
Impacted products
| Vendor | Product | Version |
|---|
{
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"fs/smb/server/transport_ipc.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "a02e432d5130da4c723aabe1205bac805889fdb2",
"status": "affected",
"version": "0626e6641f6b467447c81dd7678a69c66f7746cf",
"versionType": "git"
},
{
"lessThan": "2dc125f5da134c0915a840b62565c60a595673dd",
"status": "affected",
"version": "0626e6641f6b467447c81dd7678a69c66f7746cf",
"versionType": "git"
},
{
"lessThan": "898d527ed94c19980a4d848f10057f1fed578ffb",
"status": "affected",
"version": "0626e6641f6b467447c81dd7678a69c66f7746cf",
"versionType": "git"
},
{
"lessThan": "867ffd9d67285612da3f0498ca618297f8e41f01",
"status": "affected",
"version": "0626e6641f6b467447c81dd7678a69c66f7746cf",
"versionType": "git"
},
{
"lessThan": "6f40e50ceb99fc8ef37e5c56e2ec1d162733fef0",
"status": "affected",
"version": "0626e6641f6b467447c81dd7678a69c66f7746cf",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"fs/smb/server/transport_ipc.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": "6.1.158",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.115",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.56",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.17.*",
"status": "unaffected",
"version": "6.17.6",
"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\nksmbd: transport_ipc: validate payload size before reading handle\n\nhandle_response() dereferences the payload as a 4-byte handle without\nverifying that the declared payload size is at least 4 bytes. A malformed\nor truncated message from ksmbd.mountd can lead to a 4-byte read past the\ndeclared payload size. Validate the size before dereferencing.\n\nThis is a minimal fix to guard the initial handle read."
},
{
"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad:\n\nksmbd: transport_ipc: validar el tama\u00f1o de la carga \u00fatil antes de leer el handle\n\nhandle_response() desreferencia la carga \u00fatil como un handle de 4 bytes sin verificar que el tama\u00f1o de la carga \u00fatil declarado sea de al menos 4 bytes. Un mensaje malformado o truncado de ksmbd.mountd puede provocar una lectura de 4 bytes m\u00e1s all\u00e1 del tama\u00f1o de la carga \u00fatil declarado. Validar el tama\u00f1o antes de desreferenciar.\n\nEsta es una correcci\u00f3n m\u00ednima para proteger la lectura inicial del handle."
}
],
"id": "CVE-2025-40084",
"lastModified": "2026-10-19T21:10:00.160",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"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"
},
"exploitabilityScore": 1.8,
"impactScore": 5.2,
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary"
}
]
},
"published": "2025-10-29T14:15:55.007",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/2dc125f5da134c0915a840b62565c60a595673dd"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/6f40e50ceb99fc8ef37e5c56e2ec1d162733fef0"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/867ffd9d67285612da3f0498ca618297f8e41f01"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/898d527ed94c19980a4d848f10057f1fed578ffb"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/a02e432d5130da4c723aabe1205bac805889fdb2"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Deferred"
}
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Browse all ATT&CK techniques and the vulnerabilities related to each.
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