CVE-2026-98769
In the Linux kernel, the following vulnerability has been resolved:
usb: gadget: f_uac1_legacy: validate bRequest index in generic_{set,get}_cmd
generic_set_cmd() and generic_get_cmd() use the low nibble of ctrl->bRequest as an index into con->data[]:
struct usb_audio_control (include/linux/usb/audio.h) declares data as a 5-element array, so indices 5 through 15 write (or read) up to 44 bytes past the end of the array on the heap.
A malicious USB host can craft a class-specific SET_CUR / GET_CUR request with an arbitrary bRequest value, triggering the out-of-bounds access from an IRQ completion handler with no further preconditions.
Read full descriptionShow less
Add an ARRAY_SIZE() guard to both functions.
Technical details traces, logs and code from the original report
u8 cmd = (ctrl->bRequest & 0x0F); /* 0 .. 15 */
...
con->data[cmd] = value; /* OOB when cmd >= 5 */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
- 0.17 %
- Percentile among all scored CVEs
- 6
- Score date
- 10/20/2026
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
Show 4 references
Raw JSON (NVD)
Show
{
"id": "CVE-2026-98769",
"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": "c47d7b09891abb4f8b222317c89c7469bed8db3a",
"lessThan": "36f3f009049bc91e14dc856007932473318d12f8",
"versionType": "git"
},
{
"status": "affected",
"version": "c47d7b09891abb4f8b222317c89c7469bed8db3a",
"lessThan": "8c611876c002d712ae5f246af5188432c708f79d",
"versionType": "git"
},
{
"status": "affected",
"version": "c47d7b09891abb4f8b222317c89c7469bed8db3a",
"lessThan": "697cfe6e53b66cda196d6f8833b0ee97fefd0a8a",
"versionType": "git"
},
{
"status": "affected",
"version": "c47d7b09891abb4f8b222317c89c7469bed8db3a",
"lessThan": "9062d50e75c24dc7911be05c9b1719b3b256af15",
"versionType": "git"
}
],
"programFiles": [
"drivers/usb/gadget/function/f_uac1_legacy.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.31"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.31",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.12.113",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.56",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.10",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/usb/gadget/function/f_uac1_legacy.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2026-10-18T16:17:30.813",
"references": [
{
"url": "https://git.kernel.org/stable/c/36f3f009049bc91e14dc856007932473318d12f8",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/697cfe6e53b66cda196d6f8833b0ee97fefd0a8a",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/8c611876c002d712ae5f246af5188432c708f79d",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/9062d50e75c24dc7911be05c9b1719b3b256af15",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Received",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_uac1_legacy: validate bRequest index in generic_{set,get}_cmd\n\ngeneric_set_cmd() and generic_get_cmd() use the low nibble of\nctrl->bRequest as an index into con->data[]:\n\n u8 cmd = (ctrl->bRequest & 0x0F); /* 0 .. 15 */\n ...\n con->data[cmd] = value; /* OOB when cmd >= 5 */\n\nstruct usb_audio_control (include/linux/usb/audio.h) declares data as\na 5-element array, so indices 5 through 15 write (or read) up to 44\nbytes past the end of the array on the heap.\n\nA malicious USB host can craft a class-specific SET_CUR / GET_CUR\nrequest with an arbitrary bRequest value, triggering the out-of-bounds\naccess from an IRQ completion handler with no further preconditions.\n\nAdd an ARRAY_SIZE() guard to both functions."
}
],
"lastModified": "2026-10-19T10:19:41.037",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}