CVE-2026-93091
In the Linux kernel, the following vulnerability has been resolved:
firmware: arm_scmi: Quiesce notifications before teardown
scmi_notification_exit() clears and releases the notification instance, but transport callbacks can still deliver incoming notifications until the TX/RX channels are freed. During remove, an RX interrupt in that window can enter scmi_notify() while notification state is being torn down and then dereference freed memory. The same ordering exists on the probe error path after notification initialization.
The notification late-init worker has a separate lifetime issue: protocol event registration queues ni->init_work on the system workqueue, so destroying ni->notify_wq does not drain that work.
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If the devres group is released while init_work is still pending or running, the late-init worker can dereference the freed notification instance.
Quiesce the notification core before TX/RX channels are torn down, then clean up the channels before releasing the notification core resources. Use disable_work_sync() so future late-init queueing is rejected and any already queued or running late-init work has completed before channel teardown starts.
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: 4/10/2026
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
JSON original (NVD)
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{
"id": "CVE-2026-93091",
"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": "1e7cbfaa66d39e78bd24df0c78b55df68176b59e",
"lessThan": "6778bcabd2e0c32f73476f0bc6369013692540be",
"versionType": "git"
},
{
"status": "affected",
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{
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"versionType": "git"
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{
"status": "affected",
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"lessThan": "8e49055d0d495c9c07575ad8e111d9eaf0efb13f",
"versionType": "git"
}
],
"programFiles": [
"drivers/firmware/arm_scmi/driver.c",
"drivers/firmware/arm_scmi/notify.c",
"drivers/firmware/arm_scmi/notify.h"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.15"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.15",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.12.110",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.52",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.6",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3-rc1",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/firmware/arm_scmi/driver.c",
"drivers/firmware/arm_scmi/notify.c",
"drivers/firmware/arm_scmi/notify.h"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2026-09-17T17:18:03.063",
"references": [
{
"url": "https://git.kernel.org/stable/c/2aac23bc0a79af41104d99823bb250fae92ba144",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/5e30d3d16d1a9e599be4dcea872874e65e2c277b",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/6778bcabd2e0c32f73476f0bc6369013692540be",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/8e49055d0d495c9c07575ad8e111d9eaf0efb13f",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Received",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfirmware: arm_scmi: Quiesce notifications before teardown\n\nscmi_notification_exit() clears and releases the notification instance,\nbut transport callbacks can still deliver incoming notifications until\nthe TX/RX channels are freed. During remove, an RX interrupt in that\nwindow can enter scmi_notify() while notification state is being torn\ndown and then dereference freed memory. The same ordering exists on the\nprobe error path after notification initialization.\n\nThe notification late-init worker has a separate lifetime issue: protocol\nevent registration queues ni->init_work on the system workqueue, so\ndestroying ni->notify_wq does not drain that work. If the devres group is\nreleased while init_work is still pending or running, the late-init worker\ncan dereference the freed notification instance.\n\nQuiesce the notification core before TX/RX channels are torn down, then\nclean up the channels before releasing the notification core resources.\nUse disable_work_sync() so future late-init queueing is rejected and any\nalready queued or running late-init work has completed before channel\nteardown starts."
}
],
"lastModified": "2026-09-17T17:18:03.063",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}