CVE-2026-89983
Estado: RecibidaSin puntuar—
In the Linux kernel, the following vulnerability has been resolved:
i2c: core: fix debugfs UAF on adapter removal
i2c_del_adapter() frees the adapter's debugfs directory before it unregisters the adapter device, but the new_device sysfs attribute stays writable until device_del(). A write racing with removal still reaches i2c_device_probe(), which passes the freed adap->debugfs to debugfs_create_dir() as the new client's parent:
It's technically possible to create a client after i2c_deregister_clients has run. That client will never be unregistered and make wait_for_completion hang.
Close the window by removing the new_device attribute at the start of i2c_del_adapter(). device_remove_file() will drain any clients left.
Detalles técnicos trazas, registros y código del informe original
BUG: KASAN: slab-use-after-free in lookup_noperm_common+0x407/0x430 Read of size 4 at addr ffff88803ef87810 by task syz.0.61/6090 lookup_noperm_common+0x407/0x430 simple_start_creating+0x9c/0x110 debugfs_start_creating+0xdb/0x1a0 debugfs_create_dir+0x24/0x350 i2c_device_probe+0x814/0xbf0
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: 11
- 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
- https://git.kernel.org/stable/c/112b3d48084c820bbccf41d9783fd122e3ac4cb0
- https://git.kernel.org/stable/c/1f1bcd4eca6caa3e4258d9a31925112539406eb6
- https://git.kernel.org/stable/c/552836be2d95c688eede6371f85532abe1a71232
- https://git.kernel.org/stable/c/643fb872aa04342d27dbef52b2b3cf3fe71b2c7b
- https://git.kernel.org/stable/c/b15b548d52b43ba8ac4652bc2c7244a8dd1e9622
- https://git.kernel.org/stable/c/dc33a9762538b3250ed6b5644a4d44c748be33a6
- https://git.kernel.org/stable/c/f9094ace03e0a532cc6505d2e97b61ae738da4ed
JSON original (NVD)
Mostrar
{
"id": "CVE-2026-89983",
"cveTags": [],
"metrics": {},
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
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"vendor": "Linux",
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{
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{
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{
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{
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{
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{
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},
{
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},
{
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{
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{
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},
{
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"versionType": "semver",
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},
{
"status": "unaffected",
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"versionType": "semver",
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},
{
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{
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},
{
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"versionType": "original_commit_for_fix",
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}
],
"programFiles": [
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],
"defaultStatus": "affected"
}
]
}
],
"published": "2026-09-16T11:17:09.270",
"references": [
{
"url": "https://git.kernel.org/stable/c/112b3d48084c820bbccf41d9783fd122e3ac4cb0",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
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{
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},
{
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{
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/dc33a9762538b3250ed6b5644a4d44c748be33a6",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/f9094ace03e0a532cc6505d2e97b61ae738da4ed",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Received",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ni2c: core: fix debugfs UAF on adapter removal\n\ni2c_del_adapter() frees the adapter's debugfs directory before it\nunregisters the adapter device, but the new_device sysfs attribute\nstays writable until device_del(). A write racing with removal still\nreaches i2c_device_probe(), which passes the freed adap->debugfs to\ndebugfs_create_dir() as the new client's parent:\n\n BUG: KASAN: slab-use-after-free in lookup_noperm_common+0x407/0x430\n Read of size 4 at addr ffff88803ef87810 by task syz.0.61/6090\n lookup_noperm_common+0x407/0x430\n simple_start_creating+0x9c/0x110\n debugfs_start_creating+0xdb/0x1a0\n debugfs_create_dir+0x24/0x350\n i2c_device_probe+0x814/0xbf0\n\nIt's technically possible to create a client after i2c_deregister_clients\nhas run. That client will never be unregistered and make\nwait_for_completion hang.\n\nClose the window by removing the new_device attribute at the start of\ni2c_del_adapter(). device_remove_file() will drain any clients left."
}
],
"lastModified": "2026-09-16T11:17:09.270",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}