{"schema":"threatline.record/2","record":{"id":"CVE-2026-98771","aliases":[],"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->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.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98771","source_modified_at":"2026-10-21T12:56:46.308Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"32fe5e393455d87db4988af03915634304870fb4","lessThan":"4faaad69f18332246bbd4ca41718beb2a305bb72","status":"affected","versionType":"git"},{"version":"32fe5e393455d87db4988af03915634304870fb4","lessThan":"c85e8331d298b8f1dee8fe63718e76435cec7133","status":"affected","versionType":"git"},{"version":"32fe5e393455d87db4988af03915634304870fb4","lessThan":"e2d62928f2666a2964a23b1d39e6e762f0628d7b","status":"affected","versionType":"git"},{"version":"32fe5e393455d87db4988af03915634304870fb4","lessThan":"db9d3be156baca6ef80ae5d93acfeb85c61a74dd","status":"affected","versionType":"git"},{"version":"32fe5e393455d87db4988af03915634304870fb4","lessThan":"8a0200d14acd9db388b85cd016e68a4e60d900ec","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98771","source_modified_at":"2026-10-21T12:56:46.308Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"2.6.27","status":"affected"},{"version":"0","lessThan":"2.6.27","status":"unaffected","versionType":"semver"},{"version":"6.6.160","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.113","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.56","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.10","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98771","source_modified_at":"2026-10-21T12:56:46.308Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"4faaad69f18332246bbd4ca41718beb2a305bb72","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98771","source_modified_at":"2026-10-21T12:56:46.308Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"8a0200d14acd9db388b85cd016e68a4e60d900ec","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":0.00168,"percentile":0.05741,"score_date":"2026-10-23"},"published_at":"2026-10-18T15:48:07.367Z","modified_at":"2026-10-21T12:56:46.308Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-98771","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-21T12:56:46.308Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-98771","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/4faaad69f18332246bbd4ca41718beb2a305bb72"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/c85e8331d298b8f1dee8fe63718e76435cec7133"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/e2d62928f2666a2964a23b1d39e6e762f0628d7b"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/db9d3be156baca6ef80ae5d93acfeb85c61a74dd"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/8a0200d14acd9db388b85cd016e68a4e60d900ec"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-21T12:56:46.308Z","content_hash":"f4a29c6866952ce18c8525c6ccaa61b9d702ad6d82727f52f3ee66b7354d7b99"}}