CVE-2025-68298
In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: btusb: mediatek: Avoid btusb_mtk_claim_iso_intf() NULL deref
That function can return NULL in some cases. Even when it returns NULL, though, we still go on to call btusb_mtk_claim_iso_intf().
As of commit e9087e828827 ("Bluetooth: btusb: mediatek: Add locks for usb_driver_claim_interface()"), calling btusb_mtk_claim_iso_intf() when `btmtk_data->isopkt_intf` is NULL will cause a crash because we'll end up passing a bad pointer to device_lock(). Prior to that commit we'd pass the NULL pointer directly to usb_driver_claim_interface() which would detect it and return an error, which was handled.
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Resolve the crash in btusb_mtk_claim_iso_intf() by adding a NULL check at the start of the function. This makes the code handle a NULL `btmtk_data->isopkt_intf` the same way it did before the problematic commit (just with a slight change to the error message printed).
Technical details traces, logs and code from the original report
In btusb_mtk_setup(), we set `btmtk_data->isopkt_intf` to: usb_ifnum_to_if(data->udev, MTK_ISO_IFNUM)
CVSS
NVD hasn't assigned a CVSS score to this CVE (common since the April 2026 policy change).
Exploitation probability (EPSS)
- Probability of exploitation in the next 30 days: 0.18%
- Percentile among all scored CVEs: 7
- Score date: 10/6/2026
EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).
Affected technologies (1)
⚠ AI-inferred from the description — NVD hasn't analyzed this CVE yet, these aren't verified CPEs.
References
Raw JSON (NVD)
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{
"id": "CVE-2025-68298",
"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": "930e1790b99e5839e1af69d2f7fd808f1fba2df9",
"lessThan": "2fa09fe98ca3b114d66285f65f7e108fea131815",
"versionType": "git"
},
{
"status": "affected",
"version": "e9087e828827e5a5c85e124ce77503f2b81c3491",
"lessThan": "c3b990e0b23068da65f0004cd38ee31f43f36460",
"versionType": "git"
},
{
"status": "affected",
"version": "e9087e828827e5a5c85e124ce77503f2b81c3491",
"lessThan": "c884a0b27b4586e607431d86a1aa0bb4fb39169c",
"versionType": "git"
},
{
"status": "affected",
"version": "4194766ec8756f4f654d595ae49962acbac49490",
"versionType": "git"
},
{
"status": "affected",
"version": "6.12.13",
"lessThan": "6.12.61",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.13.2",
"lessThan": "6.14",
"versionType": "semver"
}
],
"programFiles": [
"drivers/bluetooth/btusb.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.14"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.14",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.12.61",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.17.11",
"versionType": "semver",
"lessThanOrEqual": "6.17.*"
},
{
"status": "unaffected",
"version": "6.18",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/bluetooth/btusb.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2025-12-16T16:16:08.760",
"references": [
{
"url": "https://git.kernel.org/stable/c/2fa09fe98ca3b114d66285f65f7e108fea131815",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/c3b990e0b23068da65f0004cd38ee31f43f36460",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/c884a0b27b4586e607431d86a1aa0bb4fb39169c",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Deferred",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: btusb: mediatek: Avoid btusb_mtk_claim_iso_intf() NULL deref\n\nIn btusb_mtk_setup(), we set `btmtk_data->isopkt_intf` to:\n usb_ifnum_to_if(data->udev, MTK_ISO_IFNUM)\n\nThat function can return NULL in some cases. Even when it returns\nNULL, though, we still go on to call btusb_mtk_claim_iso_intf().\n\nAs of commit e9087e828827 (\"Bluetooth: btusb: mediatek: Add locks for\nusb_driver_claim_interface()\"), calling btusb_mtk_claim_iso_intf()\nwhen `btmtk_data->isopkt_intf` is NULL will cause a crash because\nwe'll end up passing a bad pointer to device_lock(). Prior to that\ncommit we'd pass the NULL pointer directly to\nusb_driver_claim_interface() which would detect it and return an\nerror, which was handled.\n\nResolve the crash in btusb_mtk_claim_iso_intf() by adding a NULL check\nat the start of the function. This makes the code handle a NULL\n`btmtk_data->isopkt_intf` the same way it did before the problematic\ncommit (just with a slight change to the error message printed)."
}
],
"lastModified": "2026-06-17T09:58:53.627",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}