CVE-2026-58084
Full vulnerability record from the local CVENow database.
Description
To retrieve the previous timer value, the kernel calls realtimer_gettime(), which obtains the current time for the timer's clock. For a timer using CLOCK_TAI this can fail when no TAI offset has been configured, but the error return was not checked, so the uninitialized output buffer was copied to userspace. An unprivileged local user can obtain uninitialized kernel stack memory by creating a POSIX timer with CLOCK_TAI and calling timer_settime(2), potentially disclosing sensitive kernel data.
Severity
MEDIUM
CVSS score
5.5
(v3.1)
Vulnerability status
Analyzed
Source identifier
Published
2026-08-19 08:17:12.570000
Last modified
2026-10-27 12:10:00.343000
View original CVE JSON
{
"id": "CVE-2026-58084",
"sourceIdentifier": "[email protected]",
"published": "2026-08-19T08:17:12.570",
"lastModified": "2026-10-27T12:10:00.343",
"vulnStatus": "Analyzed",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "To retrieve the previous timer value, the kernel calls realtimer_gettime(), which obtains the current time for the timer's clock. For a timer using CLOCK_TAI this can fail when no TAI offset has been configured, but the error return was not checked, so the uninitialized output buffer was copied to userspace.\n\nAn unprivileged local user can obtain uninitialized kernel stack memory by creating a POSIX timer with CLOCK_TAI and calling timer_settime(2), potentially disclosing sensitive kernel data."
},
{
"lang": "es",
"value": "Para recuperar el valor anterior del temporizador, el kernel llama a realtimer_gettime(), que obtiene la hora actual para el reloj del temporizador. Para un temporizador que usa CLOCK_TAI, esto puede fallar cuando no se ha configurado ningún desplazamiento TAI, pero el retorno de error no fue verificado, por lo que el búfer de salida no inicializado fue copiado al espacio de usuario.\n\nUn usuario local no privilegiado puede obtener memoria de pila del kernel no inicializada al crear un temporizador POSIX con CLOCK_TAI y al llamar a timer_settime(2), potencialmente revelando datos sensibles del kernel."
}
],
"affected": [
{
"source": "[email protected]",
"affectedData": [
{
"vendor": "FreeBSD",
"product": "FreeBSD",
"defaultStatus": "unknown",
"modules": [
"ktimer"
],
"versions": [
{
"version": "15.1-RELEASE",
"lessThan": "p2",
"versionType": "release",
"status": "affected"
},
{
"version": "15.0-RELEASE",
"lessThan": "p12",
"versionType": "release",
"status": "affected"
}
]
}
]
}
],
"metrics": {
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"attackVector": "LOCAL",
"attackComplexity": "LOW",
"privilegesRequired": "LOW",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"availabilityImpact": "NONE"
},
"exploitabilityScore": 1.8,
"impactScore": 3.6
}
],
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"ssvcData": {
"timestamp": "2026-08-26T19:45:49.244510Z",
"id": "CVE-2026-58084",
"options": [
{
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},
{
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{
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],
"role": "CISA Coordinator",
"version": "2.0.3"
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},
"weaknesses": [
{
"source": "[email protected]",
"type": "Secondary",
"description": [
{
"lang": "en",
"value": "CWE-908"
}
]
}
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"references": [
{
"url": "https://security.freebsd.org/advisories/FreeBSD-SA-26:51.ktimer.asc",
"source": "[email protected]",
"tags": [
"Vendor Advisory"
]
}
]
}