{"id":"CVE-2021-47475","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ncomedi: vmk80xx: fix transfer-buffer overflows\n\nThe driver uses endpoint-sized USB transfer buffers but up until\nrecently had no sanity checks on the sizes.\n\nCommit e1f13c879a7c (\"staging: comedi: check validity of wMaxPacketSize\nof usb endpoints found\") inadvertently fixed NULL-pointer dereferences\nwhen accessing the transfer buffers in case a malicious device has a\nzero wMaxPacketSize.\n\nMake sure to allocate buffers large enough to handle also the other\naccesses that are done without a size check (e.g. byte 18 in\nvmk80xx_cnt_insn_read() for the VMK8061_MODEL) to avoid writing beyond\nthe buffers, for example, when doing descriptor fuzzing.\n\nThe original driver was for a low-speed device with 8-byte buffers.\nSupport was later added for a device that uses bulk transfers and is\npresumably a full-speed device with a maximum 64-byte wMaxPacketSize.","modified":"2026-03-13T05:09:02.641317Z","published":"2024-05-22T09:15:09.370Z","related":["SUSE-SU-2024:2008-1","SUSE-SU-2024:2011-1","SUSE-SU-2024:2019-1","SUSE-SU-2024:2189-1","SUSE-SU-2024:2190-1"],"references":[{"type":"FIX","url":"https://git.kernel.org/stable/c/a23461c47482fc232ffc9b819539d1f837adf2b1"},{"type":"FIX","url":"https://git.kernel.org/stable/c/ec85bcff4ed09260243d8f39faba99e1041718ba"},{"type":"FIX","url":"https://git.kernel.org/stable/c/278484ae93297b1bb1ce755f9d3b6d95a48c7d47"},{"type":"FIX","url":"https://git.kernel.org/stable/c/5229159f1d052821007aff1a1beb7873eacf1a9f"},{"type":"FIX","url":"https://git.kernel.org/stable/c/06ac746d57e6d32b062e220415c607b7e2e0fa50"},{"type":"FIX","url":"https://git.kernel.org/stable/c/199acd8c110e3ae62833c24f632b0bb1c9f012a9"},{"type":"FIX","url":"https://git.kernel.org/stable/c/33d7a470730dfe7c9bfc8da84575cf2cedd60d00"},{"type":"FIX","url":"https://git.kernel.org/stable/c/40d2a7e278e2e7c0a5fd7e997e7eb63945bf93f7"},{"type":"FIX","url":"https://git.kernel.org/stable/c/7a2021b896de1ad559d33b5c5cdd20b982242088"}],"affected":[{"database_specific":{"unresolved_ranges":[{"events":[{"introduced":"2.6.31"},{"fixed":"4.4.292"}]},{"events":[{"introduced":"4.5"},{"fixed":"4.9.290"}]},{"events":[{"introduced":"4.10"},{"fixed":"4.14.255"}]},{"events":[{"introduced":"4.15"},{"fixed":"4.19.217"}]},{"events":[{"introduced":"4.20"},{"fixed":"5.4.159"}]},{"events":[{"introduced":"5.5"},{"fixed":"5.10.79"}]},{"events":[{"introduced":"5.11"},{"fixed":"5.14.18"}]},{"events":[{"introduced":"5.15"},{"fixed":"5.15.2"}]}],"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2021-47475.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}