CVE-2025-23131
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: dlm: prevent NPD when writing a positive value to event_done do_uevent returns the value written to event_done. In case it is a positive value, new_lockspace would undo all the work, and lockspace would not be set. __dlm_new_lockspace, however, would treat that positive value as a success due to commit 8511a2728ab8 ("dlm: fix use count with multiple joins"). Down the line, device_create_lockspace would pass that NULL lockspace to dlm_find_lockspace_local, leading to a NULL pointer dereference. Treating such positive values as successes prevents the problem. Given this has been broken for so long, this is unlikely to break userspace expectations.
Severity
MEDIUM
CVSS score
5.5
(v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2025-04-16 15:16:07.547000
Last modified
2026-11-05 21:17:49.580000
View original CVE JSON
{
"id": "CVE-2025-23131",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2025-04-16T15:16:07.547",
"lastModified": "2026-11-05T21:17:49.580",
"vulnStatus": "Modified",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndlm: prevent NPD when writing a positive value to event_done\n\ndo_uevent returns the value written to event_done. In case it is a\npositive value, new_lockspace would undo all the work, and lockspace\nwould not be set. __dlm_new_lockspace, however, would treat that\npositive value as a success due to commit 8511a2728ab8 (\"dlm: fix use\ncount with multiple joins\").\n\nDown the line, device_create_lockspace would pass that NULL lockspace to\ndlm_find_lockspace_local, leading to a NULL pointer dereference.\n\nTreating such positive values as successes prevents the problem. Given\nthis has been broken for so long, this is unlikely to break userspace\nexpectations."
},
{
"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: dlm: impide NPD al escribir un valor positivo en event_done. do_uevent devuelve el valor escrito en event_done. En caso de ser un valor positivo, new_lockspace desharía todo el trabajo y no se establecería el espacio de bloqueo. Sin embargo, __dlm_new_lockspace trataría ese valor positivo como un éxito debido a el commit 8511a2728ab8 (\"dlm: corrige el recuento de uso con múltiples uniones\"). Posteriormente, device_create_lockspace pasaría ese espacio de bloqueo nulo a dlm_find_lockspace_local, lo que provocaría una desreferencia de puntero nulo. Tratar estos valores positivos como éxitos evita el problema. Dado que esto ha estado roto durante tanto tiempo, es improbable que esto altere las expectativas del espacio de usuario."
}
],
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"fs/dlm/lockspace.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "8511a2728ab82cab398e39d019f5cf1246021c1c",
"lessThan": "a1c41aebb184d9228a440dcb6761224e65b0e49a",
"versionType": "git",
"status": "affected"
},
{
"version": "8511a2728ab82cab398e39d019f5cf1246021c1c",
"lessThan": "ee28d99d789b077565cbe0377374d1e826c64d93",
"versionType": "git",
"status": "affected"
},
{
"version": "8511a2728ab82cab398e39d019f5cf1246021c1c",
"lessThan": "c7837e2c96559663c33f43da403d9cf3cf77cfa7",
"versionType": "git",
"status": "affected"
},
{
"version": "8511a2728ab82cab398e39d019f5cf1246021c1c",
"lessThan": "7109d69bec6edce546dc870e66bd2b668a3d5549",
"versionType": "git",
"status": "affected"
},
{
"version": "8511a2728ab82cab398e39d019f5cf1246021c1c",
"lessThan": "10b7a59814765d18d43555c9cef4eb3048b7e8a3",
"versionType": "git",
"status": "affected"
},
{
"version": "8511a2728ab82cab398e39d019f5cf1246021c1c",
"lessThan": "b73c4ad4d387fe5bc988145bd9f1bc0de76afd5c",
"versionType": "git",
"status": "affected"
},
{
"version": "8511a2728ab82cab398e39d019f5cf1246021c1c",
"lessThan": "8e2bad543eca5c25cd02cbc63d72557934d45f13",
"versionType": "git",
"status": "affected"
}
]
},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "affected",
"programFiles": [
"fs/dlm/lockspace.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "2.6.31",
"status": "affected"
},
{
"version": "0",
"lessThan": "2.6.31",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "5.10.260",
"lessThanOrEqual": "5.10.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "5.15.211",
"lessThanOrEqual": "5.15.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.1.177",
"lessThanOrEqual": "6.1.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.6.144",
"lessThanOrEqual": "6.6.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.12.95",
"lessThanOrEqual": "6.12.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.14.2",
"lessThanOrEqual": "6.14.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.15",
"lessThanOrEqual": "*",
"versionType": "original_commit_for_fix",
"status": "unaffected"
}
]
}
]
},
{
"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
"affectedData": [
{
"vendor": "Siemens",
"product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem",
"defaultStatus": "unknown",
"versions": [
{
"version": "0",
"lessThan": "*",
"versionType": "custom",
"status": "affected"
}
]
}
]
}
],
"metrics": {
"cvssMetricV31": [
{
"source": "[email protected]",
"type": "Primary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"attackVector": "LOCAL",
"attackComplexity": "LOW",
"privilegesRequired": "LOW",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"availabilityImpact": "HIGH"
},
"exploitabilityScore": 1.8,
"impactScore": 3.6
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"timestamp": "2026-11-05T20:39:12.296610Z",
"id": "CVE-2025-23131",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
]
},
"weaknesses": [
{
"source": "[email protected]",
"type": "Primary",
"description": [
{
"lang": "en",
"value": "CWE-476"
}
]
}
],
"configurations": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.6.31",
"versionEndExcluding": "6.14.2",
"matchCriteriaId": "F58D37CF-20C2-423F-AA5A-598AE9F724C5"
}
]
}
]
}
],
"references": [
{
"url": "https://git.kernel.org/stable/c/10b7a59814765d18d43555c9cef4eb3048b7e8a3",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/7109d69bec6edce546dc870e66bd2b668a3d5549",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/8e2bad543eca5c25cd02cbc63d72557934d45f13",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
]
},
{
"url": "https://git.kernel.org/stable/c/a1c41aebb184d9228a440dcb6761224e65b0e49a",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/b73c4ad4d387fe5bc988145bd9f1bc0de76afd5c",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
]
},
{
"url": "https://git.kernel.org/stable/c/c7837e2c96559663c33f43da403d9cf3cf77cfa7",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/ee28d99d789b077565cbe0377374d1e826c64d93",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html",
"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"
}
]
}