CVE-2026-97925
In the Linux kernel, the following vulnerability has been resolved:
tick/broadcast: Plug clockevents replacement race
朱恺乾 reported and decoded the following race condition when a broadcast device is replaced:
If the original broadcast device has a restricted interrupt affinity mask and the last CPU in that mask goes offline then the BUG() in tick_cleanup_dead_cpu() triggers because the clockevent device is not in detached state.
The reason for this is that tick_install_broadcast_device() is not serialized vs. tick broadcast operations.
The obvious cure is to serialize tick_install_broadcast_device() with tick_broadcast_lock against a concurrent tick broadcast operation.
Leer descripción completaMostrar menos
That requires to split clockevents_exchange_device() into two parts, one which does the exchange, shutdown and detach operation and the other which drops the module reference count. This is required because the module reference cannot be dropped while holding tick_broadcast_lock.
Let clockevents_exchange_device() do both operations as before, but let the broadcast device code take the two step approach and do the device exchange under tick_broadcast_lock and drop the module reference count after releasing it.
Detalles técnicos trazas, registros y código del informe original
CPUA CPUB
__tick_broadcast_oneshot_control()
bc = tick_broadcast_device.evtdev;
tick_install_broadcast_device(dev)
clockevents_exchange_device(cur, dev)
shutdown(cur);
detach(cur);
cur->handler = noop;
tick_broadcast_device.evtdev = dev;
tick_broadcast_set_event(bc, next_event); <- FAIL: arms a detached device.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: 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).
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/113a9796effe3376d2ec5aabcca1fef4fef4cd62
- https://git.kernel.org/stable/c/292b7a8ed84032cfdfc9076a690360f7d3f640d4
- https://git.kernel.org/stable/c/338d6859cd1580617807290f6d7e92b1662d4695
- https://git.kernel.org/stable/c/3525b94b2f258e0b99d1ee5a82a80b51bc1cc818
- https://git.kernel.org/stable/c/3da55616db2b6b7d9caa3b7ff1e8983224e0ed52
- https://git.kernel.org/stable/c/757aa9f548c18b96da1d56d11f65be8188a16d59
JSON original (NVD)
Mostrar
{
"id": "CVE-2026-97925",
"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": "f8381cba04ba8173fd5a2b8e5cd8b3290ee13a98",
"lessThan": "338d6859cd1580617807290f6d7e92b1662d4695",
"versionType": "git"
},
{
"status": "affected",
"version": "f8381cba04ba8173fd5a2b8e5cd8b3290ee13a98",
"lessThan": "757aa9f548c18b96da1d56d11f65be8188a16d59",
"versionType": "git"
},
{
"status": "affected",
"version": "f8381cba04ba8173fd5a2b8e5cd8b3290ee13a98",
"lessThan": "3da55616db2b6b7d9caa3b7ff1e8983224e0ed52",
"versionType": "git"
},
{
"status": "affected",
"version": "f8381cba04ba8173fd5a2b8e5cd8b3290ee13a98",
"lessThan": "3525b94b2f258e0b99d1ee5a82a80b51bc1cc818",
"versionType": "git"
},
{
"status": "affected",
"version": "f8381cba04ba8173fd5a2b8e5cd8b3290ee13a98",
"lessThan": "292b7a8ed84032cfdfc9076a690360f7d3f640d4",
"versionType": "git"
},
{
"status": "affected",
"version": "f8381cba04ba8173fd5a2b8e5cd8b3290ee13a98",
"lessThan": "113a9796effe3376d2ec5aabcca1fef4fef4cd62",
"versionType": "git"
}
],
"programFiles": [
"kernel/time/clockevents.c",
"kernel/time/tick-broadcast.c",
"kernel/time/tick-internal.h"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.21"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.21",
"versionType": "semver"
},
{
"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": [
"kernel/time/clockevents.c",
"kernel/time/tick-broadcast.c",
"kernel/time/tick-internal.h"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2026-09-25T11:17:19.680",
"references": [
{
"url": "https://git.kernel.org/stable/c/113a9796effe3376d2ec5aabcca1fef4fef4cd62",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/292b7a8ed84032cfdfc9076a690360f7d3f640d4",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/338d6859cd1580617807290f6d7e92b1662d4695",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/3525b94b2f258e0b99d1ee5a82a80b51bc1cc818",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/3da55616db2b6b7d9caa3b7ff1e8983224e0ed52",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/757aa9f548c18b96da1d56d11f65be8188a16d59",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Received",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntick/broadcast: Plug clockevents replacement race\n\n朱恺乾 reported and decoded the following race condition when a broadcast\ndevice is replaced:\n\nCPUA\t\t\t\t\tCPUB\n __tick_broadcast_oneshot_control()\n bc = tick_broadcast_device.evtdev;\n\t\t\t\t\ttick_install_broadcast_device(dev)\n \t\t\t\tclockevents_exchange_device(cur, dev)\n\t\t\t\t\t shutdown(cur);\n\t\t\t\t\t detach(cur);\n\t\t\t\t\t cur->handler = noop;\n\t\t\t\t\t tick_broadcast_device.evtdev = dev;\n\n tick_broadcast_set_event(bc, next_event); <- FAIL: arms a detached device.\n\nIf the original broadcast device has a restricted interrupt affinity mask\nand the last CPU in that mask goes offline then the BUG() in\ntick_cleanup_dead_cpu() triggers because the clockevent device is not in\ndetached state.\n\nThe reason for this is that tick_install_broadcast_device() is not\nserialized vs. tick broadcast operations.\n\nThe obvious cure is to serialize tick_install_broadcast_device() with\ntick_broadcast_lock against a concurrent tick broadcast operation.\n\nThat requires to split clockevents_exchange_device() into two parts, one\nwhich does the exchange, shutdown and detach operation and the other which\ndrops the module reference count. This is required because the module\nreference cannot be dropped while holding tick_broadcast_lock.\n\nLet clockevents_exchange_device() do both operations as before, but let the\nbroadcast device code take the two step approach and do the device\nexchange under tick_broadcast_lock and drop the module reference count\nafter releasing it."
}
],
"lastModified": "2026-10-03T11:18:10.290",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}