CVE-2025-40024
In the Linux kernel, the following vulnerability has been resolved:
vhost: Take a reference on the task in struct vhost_task.
vhost_task_create() creates a task and keeps a reference to its task_struct. That task may exit early via a signal and its task_struct will be released. A pending vhost_task_wake() will then attempt to wake the task and access a task_struct which is no longer there.
Acquire a reference on the task_struct while creating the thread and release the reference while the struct vhost_task itself is removed. If the task exits early due to a signal, then the vhost_task_wake() will still access a valid task_struct. The wake is safe and will be skipped in this case.
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Puntuación base: 7.8
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.15%
- Percentil entre todas las CVEs puntuadas: 4
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
🎯 Técnicas ATT&CK
Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.
- Explotación
T1068Exploitation for Privilege Escalationprivilege escalation75 % - Impacto principal
T1499.004Application or System Exploitationimpact65 %
Escalada de privilegios (PR:L a C:H/I:H/A:H) mediante race condition en vhost_task. Acceso local sin interacción. Impacto: DoS por acceso en liberación de memoria.
Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.
🛡️ Mitigaciones ATT&CK que cubren estas técnicas
Tecnologías afectadas (1)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
Referencias
JSON original (NVD)
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{
"id": "CVE-2025-40024",
"cveTags": [],
"metrics": {
"cvssMetricV31": [
{
"type": "Secondary",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"cvssData": {
"scope": "UNCHANGED",
"version": "3.1",
"baseScore": 7.8,
"attackVector": "LOCAL",
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"integrityImpact": "HIGH",
"userInteraction": "NONE",
"attackComplexity": "LOW",
"availabilityImpact": "HIGH",
"privilegesRequired": "LOW",
"confidentialityImpact": "HIGH"
},
"impactScore": 5.9,
"exploitabilityScore": 1.8
}
]
},
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "f9010dbdce911ee1f1af1398a24b1f9f992e0080",
"lessThan": "82a1463c968b1a6ae598a4f2fcef17b71bb7d3a0",
"versionType": "git"
},
{
"status": "affected",
"version": "f9010dbdce911ee1f1af1398a24b1f9f992e0080",
"lessThan": "d2be773a92874a070215b51b730cb2b1eaa8fae2",
"versionType": "git"
},
{
"status": "affected",
"version": "f9010dbdce911ee1f1af1398a24b1f9f992e0080",
"lessThan": "7ce635b3d3aba43296b62b5a2d97c008bc51cbd2",
"versionType": "git"
},
{
"status": "affected",
"version": "f9010dbdce911ee1f1af1398a24b1f9f992e0080",
"lessThan": "afe16653e05db07d658b55245c7a2e0603f136c0",
"versionType": "git"
}
],
"programFiles": [
"kernel/vhost_task.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.4"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.4",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.109",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.50",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.16.10",
"versionType": "semver",
"lessThanOrEqual": "6.16.*"
},
{
"status": "unaffected",
"version": "6.17",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"kernel/vhost_task.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2025-10-24T13:15:47.647",
"references": [
{
"url": "https://git.kernel.org/stable/c/7ce635b3d3aba43296b62b5a2d97c008bc51cbd2",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/82a1463c968b1a6ae598a4f2fcef17b71bb7d3a0",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/afe16653e05db07d658b55245c7a2e0603f136c0",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/d2be773a92874a070215b51b730cb2b1eaa8fae2",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Deferred",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvhost: Take a reference on the task in struct vhost_task.\n\nvhost_task_create() creates a task and keeps a reference to its\ntask_struct. That task may exit early via a signal and its task_struct\nwill be released.\nA pending vhost_task_wake() will then attempt to wake the task and\naccess a task_struct which is no longer there.\n\nAcquire a reference on the task_struct while creating the thread and\nrelease the reference while the struct vhost_task itself is removed.\nIf the task exits early due to a signal, then the vhost_task_wake() will\nstill access a valid task_struct. The wake is safe and will be skipped\nin this case."
}
],
"lastModified": "2026-07-30T06:24:06.390",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}