{"id":"CVE-2026-98771","summary":"usb: storage: sierra_ms: reject short SWoC info transfers","details":"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-\u003erev, swocInfo-\u003eLinuxSKU\nand swocInfo-\u003eLinuxVer 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.","modified":"2026-11-04T14:27:32.133175834Z","published":"2026-10-18T15:48:07.367Z","related":["SUSE-SU-2026:5091-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98771.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/353ca2623104a3baf5642c3ea31569df04ce4aaf"},{"type":"WEB","url":"https://git.kernel.org/stable/c/411da2ec8c62bfa39407e5a20d659b973b3cf311"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4faaad69f18332246bbd4ca41718beb2a305bb72"},{"type":"WEB","url":"https://git.kernel.org/stable/c/799810166646bcf9dc5a4e77bc4b0bdf6bc443f2"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8a0200d14acd9db388b85cd016e68a4e60d900ec"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c85e8331d298b8f1dee8fe63718e76435cec7133"},{"type":"WEB","url":"https://git.kernel.org/stable/c/db9d3be156baca6ef80ae5d93acfeb85c61a74dd"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e2d62928f2666a2964a23b1d39e6e762f0628d7b"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98771.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98771"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"32fe5e393455d87db4988af03915634304870fb4"},{"fixed":"353ca2623104a3baf5642c3ea31569df04ce4aaf"},{"fixed":"799810166646bcf9dc5a4e77bc4b0bdf6bc443f2"},{"fixed":"411da2ec8c62bfa39407e5a20d659b973b3cf311"},{"fixed":"4faaad69f18332246bbd4ca41718beb2a305bb72"},{"fixed":"c85e8331d298b8f1dee8fe63718e76435cec7133"},{"fixed":"e2d62928f2666a2964a23b1d39e6e762f0628d7b"},{"fixed":"db9d3be156baca6ef80ae5d93acfeb85c61a74dd"},{"fixed":"8a0200d14acd9db388b85cd016e68a4e60d900ec"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-98771.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.27"},{"fixed":"5.10.273"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.224"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.191"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.160"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.113"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.56"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.10"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-98771.json"}}],"schema_version":"1.9.2"}