usb: ljca: bound bank_num in ljca_enumerate_gpio()
In the Linux kernel, the following vulnerability has been resolved: usb: ljca: bound bank_num in ljca_enumerate_gpio() ljca_enumerate_gpio() reads desc->bank_num from the device and loops valid_pin[i] = get_unaligned_le32(...) for i < bank_num. valid_pin[] holds only LJCA_MAX_GPIO_NUM / 32 = 2 entries. Two checks run before the loop. The reply length must match struct_size(desc, bank_desc, bank_num). The product pins_per_bank * bank_num must not exceed LJCA_MAX_GPIO_NUM. Neither one bounds bank_num against the size of valid_pin[]. The reply is capped at LJCA_MAX_PAYLOAD_SIZE (60) bytes, so the struct_size check limits bank_num to 9. A device that reports bank_num 9 with pins_per_bank 7 still passes both checks. gpio_num is 63 and the reply is 56 bytes. The loop then writes nine u32 into the two entry array and overruns valid_pin[] on the stack. A broken or malicious LJCA device can therefore overflow the stack. Reject a bank_num that does not fit valid_pin[].
CVE-2026-93119
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-2026-93119
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": "acd6199f195d6de814ac4090ce0864a613b1580e",
"lessThan": "0069593170a3d177de793c9a0b36989c4f069111",
"versionType": "git"
},
{
"status": "affected",
"version": "acd6199f195d6de814ac4090ce0864a613b1580e",
"lessThan": "aed958c4f784a29cf42abb3e54af51a16bddde46",
"versionType": "git"
},
{
"status": "affected",
"version": "acd6199f195d6de814ac4090ce0864a613b1580e",
"lessThan": "9c4bc8f7426aa001387800bf0140bfc5087a6de3",
"versionType": "git"
},
{
"status": "affected",
"version": "acd6199f195d6de814ac4090ce0864a613b1580e",
"lessThan": "dd9483726d0f16c1a56879c3edb65128259a4e2b",
"versionType": "git"
}
],
"programFiles": [
"drivers/usb/misc/usb-ljca.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.7"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.7",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.12.110",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.52",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.6",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/usb/misc/usb-ljca.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-93119
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #37845 · Revision 1
- Added to Heist Feed
- Publisher date