{"id":"CVE-2026-99038","title":"memstick: rtsx_usb_ms: complete requests after eject instead of dropping them","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nmemstick: rtsx_usb_ms: complete requests after eject instead of dropping them\n\nmemstick_check() can pass its host->removing check just before\nrtsx_usb_ms_drv_remove() s…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 99451dceeb5fdd789f0a2eeb3ee029e80d2ccc40 < f2c181e1d58e911804e14543b2f1cc6b23a0d4d6","Linux >= 99451dceeb5fdd789f0a2eeb3ee029e80d2ccc40 < 5b599e28aeb3684772aef64f46cc6f25f4c67128","Linux >= 99451dceeb5fdd789f0a2eeb3ee029e80d2ccc40 < d7e811c3a49cd5cff529c157df886719e09370ec","Linux >= 99451dceeb5fdd789f0a2eeb3ee029e80d2ccc40 < 5616da0f92339328fa1472876df51555e15ad340","Linux >= 99451dceeb5fdd789f0a2eeb3ee029e80d2ccc40 < c96ca94425b076dc398d929366e378d1e22ec794","Linux 3.16"],"published":"2026-10-23","updated":"2026-10-23","sourceUpdated":"2026-10-23T12:21:56.333Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-99038","references":[{"url":"https://git.kernel.org/stable/c/f2c181e1d58e911804e14543b2f1cc6b23a0d4d6"},{"url":"https://git.kernel.org/stable/c/5b599e28aeb3684772aef64f46cc6f25f4c67128"},{"url":"https://git.kernel.org/stable/c/d7e811c3a49cd5cff529c157df886719e09370ec"},{"url":"https://git.kernel.org/stable/c/5616da0f92339328fa1472876df51555e15ad340"},{"url":"https://git.kernel.org/stable/c/c96ca94425b076dc398d929366e378d1e22ec794"}],"tags":["cve.org"],"ingestedAt":"2026-10-23T13:24:55.529Z","slug":"CVE-2026-99038","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nmemstick: rtsx_usb_ms: complete requests after eject instead of dropping them\n\nmemstick_check() can pass its host->removing check just before\nrtsx_usb_ms_drv_remove() sets eject/removing. Its next request is then\nsilently dropped: rtsx_usb_ms_request() skips schedule_work() once eject\nis set, and drv_remove's cancel_work_sync() can also cancel a queued\nhandle_req before it picks the request up. Nobody completes\ncard->mrq_complete.\n\nOnce memstick core waits for requests without a timeout (\"memstick: core:\nwait for request completion before freeing card\"), this hangs removal:\nmemstick_check() never returns and memstick_remove_host() blocks in\nflush_workqueue():\n\n  INFO: task kworker/u10:3:65 blocked for more than 20 seconds.\n  Workqueue: kmemstick memstick_check\n   __wait_for_common\n   memstick_check\n\n  INFO: task kworker/1:1:33 blocked for more than 20 seconds.\n  Workqueue: usb_hub_wq hub_event\n   __flush_workqueue\n   memstick_remove_host\n   rtsx_usb_ms_drv_remove\n\nNever drop a request. rtsx_usb_ms_request() always schedules handle_req,\nand handle_req fails requests with -ENOMEDIUM once eject is set, without\ntouching the device. drv_remove flushes handle_req instead of cancelling\nit, and cancels it only after memstick_remove_host(), when no new\nrequest can arrive, so it cannot run on a freed host.\n\nThe host_mutex drain in drv_remove is removed: handle_req always leaves\nhost->req NULL when it finishes, so the drain never had anything to do,\nand it would now race with handle_req.\n\n## Affected\n\n- `Linux >= 99451dceeb5fdd789f0a2eeb3ee029e80d2ccc40 < f2c181e1d58e911804e14543b2f1cc6b23a0d4d6`\n- `Linux >= 99451dceeb5fdd789f0a2eeb3ee029e80d2ccc40 < 5b599e28aeb3684772aef64f46cc6f25f4c67128`\n- `Linux >= 99451dceeb5fdd789f0a2eeb3ee029e80d2ccc40 < d7e811c3a49cd5cff529c157df886719e09370ec`\n- `Linux >= 99451dceeb5fdd789f0a2eeb3ee029e80d2ccc40 < 5616da0f92339328fa1472876df51555e15ad340`\n- `Linux >= 99451dceeb5fdd789f0a2eeb3ee029e80d2ccc40 < c96ca94425b076dc398d929366e378d1e22ec794`\n- `Linux 3.16`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}