{"id":"CVE-2026-98771","published":"2026-10-18T16:17:31.020","lastModified":"2026-10-19T10:19:41.213","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nusb: storage: sierra_ms: reject short SWoC info transfers\n\nsierra_get_swoc_info() requests sizeof(struct swoc_info) (60) bytes\nfrom the device via usb_control_msg(), but its callers only treat a\nnegative return value as failure. A device that answers the\nvendor-specific GetSwocInfo request with a short IN transfer is\ntherefore accepted, leaving the tail of the freshly allocated\n(kmalloc(), non-zeroing) swoc_info buffer uninitialized.\n\ntruinst_show() subsequently prints swocInfo->rev, swocInfo->LinuxSKU\nand swocInfo->LinuxVer from that buffer into the world-readable\n(0444) \"truinst\" sysfs attribute. An emulated/malicious USB device\n(VID 0x1199, PID 0x0fff) can exploit this to disclose up to 5 bytes\nof stale kernel heap memory (kmalloc-64) to unprivileged userspace,\nonce per sysfs read, indefinitely. On kernels built without\ninit_on_alloc this leaks recently freed heap contents.\n\nOnly accept the transfer when the full structure was received.\nsierra_ms_init() already retries failed queries, so well-behaved\ndevices are unaffected.","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/8a0200d14acd9db388b85cd016e68a4e60d900ec","tags":[]},{"url":"https://git.kernel.org/stable/c/c85e8331d298b8f1dee8fe63718e76435cec7133","tags":[]},{"url":"https://git.kernel.org/stable/c/db9d3be156baca6ef80ae5d93acfeb85c61a74dd","tags":[]},{"url":"https://git.kernel.org/stable/c/e2d62928f2666a2964a23b1d39e6e762f0628d7b","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}