usb: storage: sierra_ms: reject short SWoC info transfers
In the Linux kernel, the following vulnerability has been resolved: usb: storage: sierra_ms: reject short SWoC info transfers sierra_get_swoc_info() requests sizeof(struct swoc_info) (60) bytes from the device via usb_control_msg(), but its callers only treat a negative return value as failure. A device that answers the vendor-specific GetSwocInfo request with a short IN transfer is therefore accepted, leaving the tail of the freshly allocated (kmalloc(), non-zeroing) swoc_info buffer uninitialized. truinst_show() subsequently prints swocInfo->rev, swocInfo->LinuxSKU and swocInfo->LinuxVer from that buffer into the world-readable (0444) "truinst" sysfs attribute. An emulated/malicious USB device (VID 0x1199, PID 0x0fff) can exploit this to disclose up to 5 bytes of stale kernel heap memory (kmalloc-64) to unprivileged userspace, once per sysfs read, indefinitely. On kernels built without init_on_alloc this leaks recently freed heap contents. Only accept the transfer when the full structure was received. sierra_ms_init() already retries failed queries, so well-behaved devices are unaffected.
CVE-2026-98771
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-2026-98771
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": "32fe5e393455d87db4988af03915634304870fb4",
"lessThan": "4faaad69f18332246bbd4ca41718beb2a305bb72",
"versionType": "git"
},
{
"status": "affected",
"version": "32fe5e393455d87db4988af03915634304870fb4",
"lessThan": "c85e8331d298b8f1dee8fe63718e76435cec7133",
"versionType": "git"
},
{
"status": "affected",
"version": "32fe5e393455d87db4988af03915634304870fb4",
"lessThan": "e2d62928f2666a2964a23b1d39e6e762f0628d7b",
"versionType": "git"
},
{
"status": "affected",
"version": "32fe5e393455d87db4988af03915634304870fb4",
"lessThan": "db9d3be156baca6ef80ae5d93acfeb85c61a74dd",
"versionType": "git"
},
{
"status": "affected",
"version": "32fe5e393455d87db4988af03915634304870fb4",
"lessThan": "8a0200d14acd9db388b85cd016e68a4e60d900ec",
"versionType": "git"
}
],
"programFiles": [
"drivers/usb/storage/sierra_ms.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.27"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.27",
"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/storage/sierra_ms.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-98771
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #48966 · Revision 1
- Added to Heist Feed
- Publisher date