FKIE_CVE-2025-39870
Vulnerability from fkie_nvd - Published: 2025-09-23 06:15 - Updated: 2026-10-19 21:10
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved:
dmaengine: idxd: Fix double free in idxd_setup_wqs()
The clean up in idxd_setup_wqs() has had a couple bugs because the error
handling is a bit subtle. It's simpler to just re-write it in a cleaner
way. The issues here are:
1) If "idxd->max_wqs" is <= 0 then we call put_device(conf_dev) when
"conf_dev" hasn't been initialized.
2) If kzalloc_node() fails then again "conf_dev" is invalid. It's
either uninitialized or it points to the "conf_dev" from the
previous iteration so it leads to a double free.
It's better to free partial loop iterations within the loop and then
the unwinding at the end can handle whole loop iterations. I also
renamed the labels to describe what the goto does and not where the goto
was located.
References
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | 6.15 | |
| linux | linux_kernel | 6.15 | |
| linux | linux_kernel | 6.17 | |
| linux | linux_kernel | 6.17 | |
| linux | linux_kernel | 6.17 | |
| linux | linux_kernel | 6.17 | |
| linux | linux_kernel | 6.17 | |
| debian | debian_linux | 11.0 |
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{
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"product": "Linux",
"programFiles": [
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],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
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"versionType": "git"
},
{
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},
{
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"versionType": "git"
},
{
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"versionType": "git"
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"status": "affected",
"version": "6.6.92",
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},
{
"lessThan": "6.12.48",
"status": "affected",
"version": "6.12.30",
"versionType": "semver"
},
{
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}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/dma/idxd/init.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.15"
},
{
"lessThan": "6.15",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.153",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.107",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.48",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.16.*",
"status": "unaffected",
"version": "6.16.8",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.17",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"configurations": [
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"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: idxd: Fix double free in idxd_setup_wqs()\n\nThe clean up in idxd_setup_wqs() has had a couple bugs because the error\nhandling is a bit subtle. It\u0027s simpler to just re-write it in a cleaner\nway. The issues here are:\n\n1) If \"idxd-\u003emax_wqs\" is \u003c= 0 then we call put_device(conf_dev) when\n \"conf_dev\" hasn\u0027t been initialized.\n2) If kzalloc_node() fails then again \"conf_dev\" is invalid. It\u0027s\n either uninitialized or it points to the \"conf_dev\" from the\n previous iteration so it leads to a double free.\n\nIt\u0027s better to free partial loop iterations within the loop and then\nthe unwinding at the end can handle whole loop iterations. I also\nrenamed the labels to describe what the goto does and not where the goto\nwas located."
},
{
"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ndmaengine: idxd: Correcci\u00f3n de doble liberaci\u00f3n en idxd_setup_wqs()\n\nLa limpieza en idxd_setup_wqs() ha tenido un par de errores porque el manejo de errores es un poco sutil. Es m\u00e1s simple simplemente reescribirlo de una manera m\u00e1s limpia. Los problemas aqu\u00ed son:\n\n1) Si \u0027idxd-\u003emax_wqs\u0027 es menor o igual que 0, entonces llamamos a put_device(conf_dev) cuando \u0027conf_dev\u0027 no ha sido inicializado.\n2) Si kzalloc_node() falla, entonces nuevamente \u0027conf_dev\u0027 es inv\u00e1lido. Est\u00e1 sin inicializar o apunta al \u0027conf_dev\u0027 de la iteraci\u00f3n anterior, lo que lleva a una doble liberaci\u00f3n.\n\nEs mejor liberar iteraciones parciales del bucle dentro del bucle y luego el desenrollado al final puede manejar iteraciones completas del bucle. Tambi\u00e9n renombr\u00e9 las etiquetas para describir lo que hace el goto y no d\u00f3nde estaba ubicado el goto."
}
],
"id": "CVE-2025-39870",
"lastModified": "2026-10-19T21:10:00.160",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"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"
},
"exploitabilityScore": 1.8,
"impactScore": 5.9,
"source": "nvd@nist.gov",
"type": "Primary"
}
]
},
"published": "2025-09-23T06:15:46.240",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
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"tags": [
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"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"type": "Primary"
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]
}
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Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
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They have not been verified by an analyst and are provided for guidance only.
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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.