CVE-2026-98198
In the Linux kernel, the following vulnerability has been resolved:
hwmon: (pwm-fan) Stop RPM timer before freeing tach data
sample_timer() rearms the RPM timer and accesses the devm-managed ctx->tachs and ctx->pulses_per_revolution arrays. The cleanup action which stops the timer is registered before those arrays are allocated.
Since devres releases entries in reverse order, driver detach can free the arrays before pwm_fan_cleanup() shuts down the timer. A timer expiry in that window accesses the freed tach data.
With a KASAN kernel, a test-only kprobe delayed entry to pwm_fan_cleanup() while normal sysfs unbind ran.
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Each of three runs reported three four-byte reads and two four-byte writes in sample_timer() after its backing devm allocations had been freed. The helper did not invoke the timer callback, cleanup actions or free functions.
With the fix, three matching unbind runs completed without KASAN, BUG, WARNING, Oops or panic. Instrumentation confirmed that timer retirement completed before the first timer backing allocation was released.
Split timer retirement from the power cleanup and register its devres action after the timer backing data and IRQ actions are installed. This preserves the early power rollback action while ensuring the timer is retired before its backing data is released. Use timer_shutdown_sync() because the callback can rearm itself.
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: 0.18%
- Percentil entre todas las CVEs puntuadas: 6
- 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
JSON original (NVD)
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{
"id": "CVE-2026-98198",
"cveTags": [],
"metrics": {},
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
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"vendor": "Linux",
"product": "Linux",
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{
"status": "affected",
"version": "01695410d4529e38fea6159fa9f1260c598290b0",
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{
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"lessThan": "26d5ff79768548efb1e604bb6e8697c101e06269",
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}
],
"programFiles": [
"drivers/hwmon/pwm-fan.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.12"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.12",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.12.112",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.54",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.8",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3-rc4",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/hwmon/pwm-fan.c"
],
"defaultStatus": "affected"
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],
"published": "2026-10-06T09:18:05.440",
"references": [
{
"url": "https://git.kernel.org/stable/c/1e824fdb14a187ce56697e803b02b1e86243a755",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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{
"url": "https://git.kernel.org/stable/c/26d5ff79768548efb1e604bb6e8697c101e06269",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/b48339b0a577783e4590a69e4cd2f2760ce33154",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Received",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (pwm-fan) Stop RPM timer before freeing tach data\n\nsample_timer() rearms the RPM timer and accesses the devm-managed\nctx->tachs and ctx->pulses_per_revolution arrays. The cleanup action\nwhich stops the timer is registered before those arrays are allocated.\n\nSince devres releases entries in reverse order, driver detach can free\nthe arrays before pwm_fan_cleanup() shuts down the timer. A timer expiry\nin that window accesses the freed tach data.\n\nWith a KASAN kernel, a test-only kprobe delayed entry to\npwm_fan_cleanup() while normal sysfs unbind ran. Each of three runs\nreported three four-byte reads and two four-byte writes in sample_timer()\nafter its backing devm allocations had been freed. The helper did not\ninvoke the timer callback, cleanup actions or free functions.\n\nWith the fix, three matching unbind runs completed without KASAN, BUG,\nWARNING, Oops or panic. Instrumentation confirmed that timer retirement\ncompleted before the first timer backing allocation was released.\n\nSplit timer retirement from the power cleanup and register its devres\naction after the timer backing data and IRQ actions are installed. This\npreserves the early power rollback action while ensuring the timer is\nretired before its backing data is released. Use timer_shutdown_sync()\nbecause the callback can rearm itself."
}
],
"lastModified": "2026-10-06T09:18:05.440",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}