CVE-2026-98344
Estado: RecibidaSin puntuar—
In the Linux kernel, the following vulnerability has been resolved:
dmaengine: Fix device kref underflow in dma_chan_put()
dma_chan_get() takes chan->device->ref only on the slow path:
dma_chan_put() drops the ref unconditionally, so every fast-path get/put pair drops one extra device reference.
The bug fires when two conditions hold together: a non-private provider has a persistent client holding chan->client_count > 0 and another client cycles dmaengine_get()/dmaengine_put(). When the kref hits zero, the subsequent dma_find_channel() returns NULL even though the provider module is still loaded.
Fix this by dropping device->ref only on the last put, matching the single slow-path get.
Detalles técnicos trazas, registros y código del informe original
/* no kref on fast path */
if (chan->client_count) {
__module_get(owner);
chan->client_count++;
return 0;
}
if (!try_module_get(owner))
return -ENODEV;
if (!dma_device_get(chan->device)) { // calls kref_get_unless_zero()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: 7
- 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/036b527f92570206da4b8c40b38f8d689e29d0f3
- https://git.kernel.org/stable/c/1a0d9b406febf23054ad595fd47b29325e70fb2d
- https://git.kernel.org/stable/c/44dab659064eb5c10adb0306510eebe848ed592d
- https://git.kernel.org/stable/c/57f7f1c6827be7d8f80feca48d2125fb91c6f6ed
- https://git.kernel.org/stable/c/5fb1797a8c9485e40e5492fa0338ab5c7d1f3fef
- https://git.kernel.org/stable/c/77906ac448d2fa81fa710ae26c0e591ebdc81154
- https://git.kernel.org/stable/c/7c3f4ce651d43705f9ec7f778f642a90d5ff4fba
- https://git.kernel.org/stable/c/de2677e57d3161390d8a508f08cddec6ef7e4b23
JSON original (NVD)
Mostrar
{
"id": "CVE-2026-98344",
"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": "8ad342a863590b24ce77681b7e081363fb3333f7",
"lessThan": "036b527f92570206da4b8c40b38f8d689e29d0f3",
"versionType": "git"
},
{
"status": "affected",
"version": "8ad342a863590b24ce77681b7e081363fb3333f7",
"lessThan": "5fb1797a8c9485e40e5492fa0338ab5c7d1f3fef",
"versionType": "git"
},
{
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"versionType": "git"
},
{
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"versionType": "git"
},
{
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"lessThan": "de2677e57d3161390d8a508f08cddec6ef7e4b23",
"versionType": "git"
},
{
"status": "affected",
"version": "8ad342a863590b24ce77681b7e081363fb3333f7",
"lessThan": "1a0d9b406febf23054ad595fd47b29325e70fb2d",
"versionType": "git"
},
{
"status": "affected",
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"versionType": "git"
},
{
"status": "affected",
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"lessThan": "44dab659064eb5c10adb0306510eebe848ed592d",
"versionType": "git"
}
],
"programFiles": [
"drivers/dma/dmaengine.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.6"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.6",
"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": "6.12.112",
"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/dma/dmaengine.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2026-10-06T09:18:27.323",
"references": [
{
"url": "https://git.kernel.org/stable/c/036b527f92570206da4b8c40b38f8d689e29d0f3",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/1a0d9b406febf23054ad595fd47b29325e70fb2d",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/44dab659064eb5c10adb0306510eebe848ed592d",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/57f7f1c6827be7d8f80feca48d2125fb91c6f6ed",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/5fb1797a8c9485e40e5492fa0338ab5c7d1f3fef",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/77906ac448d2fa81fa710ae26c0e591ebdc81154",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/7c3f4ce651d43705f9ec7f778f642a90d5ff4fba",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/de2677e57d3161390d8a508f08cddec6ef7e4b23",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Received",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: Fix device kref underflow in dma_chan_put()\n\ndma_chan_get() takes chan->device->ref only on the slow path:\n\n\t/* no kref on fast path */\n\tif (chan->client_count) {\n\t\t__module_get(owner);\n\t\tchan->client_count++;\n\t\treturn 0;\n\t}\n\tif (!try_module_get(owner))\n\t\treturn -ENODEV;\n\tif (!dma_device_get(chan->device)) { // calls kref_get_unless_zero()\n\ndma_chan_put() drops the ref unconditionally, so every fast-path\nget/put pair drops one extra device reference.\n\nThe bug fires when two conditions hold together: a non-private\nprovider has a persistent client holding chan->client_count > 0\nand another client cycles dmaengine_get()/dmaengine_put().\nWhen the kref hits zero, the subsequent dma_find_channel() returns\nNULL even though the provider module is still loaded.\n\nFix this by dropping device->ref only on the last put, matching the\nsingle slow-path get."
}
],
"lastModified": "2026-10-06T09:18:27.323",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}