CVE-2026-98837
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: ALSA: caiaq: unregister the input device when probe fails setup_card() registers the input device, whose name and phys point into struct snd_usb_caiaqdev, and then goes on to snd_card_register() and snd_usb_caiaq_control_init(). If either fails, snd_probe() calls snd_card_free(), which frees the device state but leaves the input device registered: card_free() only clears the pointer, and the input device is unregistered from snd_disconnect() alone. Reading its "uevent" attribute afterwards dereferences freed memory: BUG: KASAN: slab-use-after-free in string+0x4a9/0x4f0 Read of size 1 at addr ffff8880208f5043 by task caiaq/4967 add_uevent_var+0x183/0x3a0 input_dev_uevent+0x162/0x900 dev_uevent+0x2f1/0x870 uevent_show+0x1ca/0x3a0 ... Unregister the input device on the probe error path, as snd_disconnect() does. snd_usb_caiaq_input_disconnect() is a no-op when no input device was registered. Reproduced with a raw-gadget Audio Kontrol 1 and a temporary hack that makes snd_usb_caiaq_control_init() fail.
Severity
Not scored
CVSS score
Not available
Vulnerability status
Received
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-10-18 16:17:37.943000
Last modified
2026-10-30 13:21:29.920000
View original CVE JSON
{
"id": "CVE-2026-98837",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-10-18T16:17:37.943",
"lastModified": "2026-10-30T13:21:29.920",
"vulnStatus": "Received",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: caiaq: unregister the input device when probe fails\n\nsetup_card() registers the input device, whose name and phys point into\nstruct snd_usb_caiaqdev, and then goes on to snd_card_register() and\nsnd_usb_caiaq_control_init(). If either fails, snd_probe() calls\nsnd_card_free(), which frees the device state but leaves the input\ndevice registered: card_free() only clears the pointer, and the input\ndevice is unregistered from snd_disconnect() alone. Reading its \"uevent\"\nattribute afterwards dereferences freed memory:\n\n BUG: KASAN: slab-use-after-free in string+0x4a9/0x4f0\n Read of size 1 at addr ffff8880208f5043 by task caiaq/4967\n add_uevent_var+0x183/0x3a0\n input_dev_uevent+0x162/0x900\n dev_uevent+0x2f1/0x870\n uevent_show+0x1ca/0x3a0\n ...\n\nUnregister the input device on the probe error path, as\nsnd_disconnect() does. snd_usb_caiaq_input_disconnect() is a no-op when\nno input device was registered.\n\nReproduced with a raw-gadget Audio Kontrol 1 and a temporary hack that\nmakes snd_usb_caiaq_control_init() fail."
}
],
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"sound/usb/caiaq/device.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
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"lessThan": "7017c9dda1ebbab428a6fd29c841596b5c9c84d1",
"versionType": "git",
"status": "affected"
},
{
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"versionType": "git",
"status": "affected"
},
{
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},
{
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"versionType": "git",
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{
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{
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{
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{
"version": "5.10.258",
"lessThan": "5.10.273",
"versionType": "semver",
"status": "affected"
},
{
"version": "5.15.209",
"lessThan": "5.15.224",
"versionType": "semver",
"status": "affected"
},
{
"version": "6.1.175",
"lessThan": "6.1.191",
"versionType": "semver",
"status": "affected"
},
{
"version": "6.6.140",
"lessThan": "6.6.160",
"versionType": "semver",
"status": "affected"
},
{
"version": "6.12.86",
"lessThan": "6.12.113",
"versionType": "semver",
"status": "affected"
},
{
"version": "6.18.27",
"lessThan": "6.18.56",
"versionType": "semver",
"status": "affected"
},
{
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"lessThan": "7.1",
"versionType": "semver",
"status": "affected"
}
]
},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "affected",
"programFiles": [
"sound/usb/caiaq/device.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "7.1",
"status": "affected"
},
{
"version": "0",
"lessThan": "7.1",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "5.10.273",
"lessThanOrEqual": "5.10.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "5.15.224",
"lessThanOrEqual": "5.15.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.1.191",
"lessThanOrEqual": "6.1.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.6.160",
"lessThanOrEqual": "6.6.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.12.113",
"lessThanOrEqual": "6.12.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.18.56",
"lessThanOrEqual": "6.18.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.2.10",
"lessThanOrEqual": "7.2.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.3",
"lessThanOrEqual": "*",
"versionType": "original_commit_for_fix",
"status": "unaffected"
}
]
}
]
}
],
"metrics": {},
"references": [
{
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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{
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{
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{
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{
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}
]
}