Answer in brief
CVE-2026-98771 records a Unknown severity vulnerability in usb: storage: sierra_ms: reject short SWoC info transfers. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=32fe5e393455d87db4988af03915634304870fb4 <c85e8331d298b8f1dee8fe63718e76435cec7133 || >=32fe5e393455d87db4988af03915634304870fb4 <e2d62928f2666a2964a23b1d39e6e762f0628d7b || >=32fe5e393455d87db4988af03915634304870fb4 <db9d3be156baca6ef80ae5d93acfeb85c61a74dd || >=32fe5e393455d87db4988af03915634304870fb4 <8a0200d14acd9db388b85cd016e68a4e60d900ec | c85e8331d298b8f1dee8fe63718e76435cec7133, e2d62928f2666a2964a23b1d39e6e762f0628d7b, db9d3be156baca6ef80ae5d93acfeb85c61a74dd, 8a0200d14acd9db388b85cd016e68a4e60d900ec |
| Linux/Linuxgeneric | 2.6.27 | Not reported |
| Linux/Linuxgeneric | >=32fe5e393455d87db4988af03915634304870fb4 <4faaad69f18332246bbd4ca41718beb2a305bb72 || >=32fe5e393455d87db4988af03915634304870fb4 <c85e8331d298b8f1dee8fe63718e76435cec7133 || >=32fe5e393455d87db4988af03915634304870fb4 <e2d62928f2666a2964a23b1d39e6e762f0628d7b || >=32fe5e393455d87db4988af03915634304870fb4 <db9d3be156baca6ef80ae5d93acfeb85c61a74dd || >=32fe5e393455d87db4988af03915634304870fb4 <8a0200d14acd9db388b85cd016e68a4e60d900ec | 4faaad69f18332246bbd4ca41718beb2a305bb72, c85e8331d298b8f1dee8fe63718e76435cec7133, e2d62928f2666a2964a23b1d39e6e762f0628d7b, db9d3be156baca6ef80ae5d93acfeb85c61a74dd, 8a0200d14acd9db388b85cd016e68a4e60d900ec |
Published upstream
Oct 18, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 21, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 18, 2026
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.
Quoted source text, attributed separately from HOL analysis.