usb: gadget: f_uac1_legacy: validate bRequest index in generic_{set,get}_cmd
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[]: u8 cmd = (ctrl->bRequest & 0x0F); /* 0 .. 15 */ ... con->data[cmd] = value; /* OOB when cmd >= 5 */ 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. Add an ARRAY_SIZE() guard to both functions.
CVE-2026-98769
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-98769
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "c47d7b09891abb4f8b222317c89c7469bed8db3a",
"lessThan": "da841c1511a6160b8bc6bb7b7c6d4c9fb76fb51e",
"versionType": "git"
},
{
"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": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"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"
}
]- Related CVEs
- CVE-2026-98769
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #48964 · Revision 1
- Added to Heist Feed
- Publisher date