CVE-2026-97905
Estado: RecibidaSin puntuar—
In the Linux kernel, the following vulnerability has been resolved:
cpufreq: zero-initialize policy cpumask before sysfs publication
cpufreq_policy_alloc() allocates policy->cpus with alloc_cpumask_var(), i.e. without __GFP_ZERO, unlike the sibling related_cpus and real_cpus masks. With CONFIG_CPUMASK_OFFSTACK=y the mask is a separate kmalloc_node() allocation, so its bitmap holds whatever the slab allocator left behind:
This leaves a window in which the sysfs attributes are already reachable while policy->cpus is still garbage. show()/store() gate on policy_is_inactive(), i.e. cpumask_empty(policy->cpus), so a non-zero bitmap makes them run the attribute callbacks on a policy that is not initialized yet.
Leer descripción completaMostrar menos
Fix this by using zalloc_cpumask_var() for policy->cpus.
Detalles técnicos trazas, registros y código del informe original
cpufreq_online()
cpufreq_policy_alloc()
alloc_cpumask_var(&policy->cpus) /* bitmap is uninitialized */
kobject_init_and_add() /* policy%u/ appears in sysfs */
cpufreq_policy_online()
cpumask_copy(policy->cpus, cpumask_of(cpu)) /* first valid value */CVSS
NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.21%
- Percentil entre todas las CVEs puntuadas: 10
- Fecha de la puntuación: 5/10/2026
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).
Tecnologías afectadas (1)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
Referencias
- https://git.kernel.org/stable/c/06f273d29e5e0fe5c775a65c563fbeed8cd94c7a
- https://git.kernel.org/stable/c/0de2f3918fbbbb767e7e716178194b66560dd12a
- https://git.kernel.org/stable/c/54d37bcf2f497140b9207968557ddb484058e749
- https://git.kernel.org/stable/c/6e166b9281dec98aed19213a84235250e5fdb081
- https://git.kernel.org/stable/c/bbc0472d2270bf732142ca71579d6ede636174ed
- https://git.kernel.org/stable/c/ca52482508b3ac9febe74ca4f732647d394727b8
- https://git.kernel.org/stable/c/e13370c5b549712f49f80234df249303381c53b4
- https://git.kernel.org/stable/c/e807920031ca32b668f9e7a1efbd21858f03d64b
JSON original (NVD)
Mostrar
{
"id": "CVE-2026-97905",
"cveTags": [],
"metrics": {},
"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": "2fc3384dc75bf7333384c7a16d12c796f61c3f56",
"lessThan": "e13370c5b549712f49f80234df249303381c53b4",
"versionType": "git"
},
{
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"versionType": "git"
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{
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"lessThan": "ca52482508b3ac9febe74ca4f732647d394727b8",
"versionType": "git"
},
{
"status": "affected",
"version": "2fc3384dc75bf7333384c7a16d12c796f61c3f56",
"lessThan": "06f273d29e5e0fe5c775a65c563fbeed8cd94c7a",
"versionType": "git"
},
{
"status": "affected",
"version": "2fc3384dc75bf7333384c7a16d12c796f61c3f56",
"lessThan": "0de2f3918fbbbb767e7e716178194b66560dd12a",
"versionType": "git"
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{
"status": "affected",
"version": "2fc3384dc75bf7333384c7a16d12c796f61c3f56",
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"versionType": "git"
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{
"status": "affected",
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"versionType": "git"
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{
"status": "affected",
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"lessThan": "54d37bcf2f497140b9207968557ddb484058e749",
"versionType": "git"
}
],
"programFiles": [
"drivers/cpufreq/cpufreq.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.2"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.2",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.271",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.222",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.189",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.158",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.111",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.53",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.7",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3-rc3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/cpufreq/cpufreq.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2026-09-25T11:17:17.403",
"references": [
{
"url": "https://git.kernel.org/stable/c/06f273d29e5e0fe5c775a65c563fbeed8cd94c7a",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/0de2f3918fbbbb767e7e716178194b66560dd12a",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/54d37bcf2f497140b9207968557ddb484058e749",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/6e166b9281dec98aed19213a84235250e5fdb081",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/bbc0472d2270bf732142ca71579d6ede636174ed",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/ca52482508b3ac9febe74ca4f732647d394727b8",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/e13370c5b549712f49f80234df249303381c53b4",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/e807920031ca32b668f9e7a1efbd21858f03d64b",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Received",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncpufreq: zero-initialize policy cpumask before sysfs publication\n\ncpufreq_policy_alloc() allocates policy->cpus with alloc_cpumask_var(),\ni.e. without __GFP_ZERO, unlike the sibling related_cpus and real_cpus\nmasks. With CONFIG_CPUMASK_OFFSTACK=y the mask is a separate\nkmalloc_node() allocation, so its bitmap holds whatever the slab allocator\nleft behind:\n\n cpufreq_online()\n cpufreq_policy_alloc()\n alloc_cpumask_var(&policy->cpus) /* bitmap is uninitialized */\n kobject_init_and_add() /* policy%u/ appears in sysfs */\n cpufreq_policy_online()\n cpumask_copy(policy->cpus, cpumask_of(cpu)) /* first valid value */\n\nThis leaves a window in which the sysfs attributes are already reachable\nwhile policy->cpus is still garbage. show()/store() gate on\npolicy_is_inactive(), i.e. cpumask_empty(policy->cpus), so a non-zero\nbitmap makes them run the attribute callbacks on a policy that is not\ninitialized yet.\n\nFix this by using zalloc_cpumask_var() for policy->cpus."
}
],
"lastModified": "2026-10-03T11:18:08.840",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}