{"id":"CVE-2021-47040","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring: fix overflows checks in provide buffers\n\nColin reported before possible overflow and sign extension problems in\nio_provide_buffers_prep(). As Linus pointed out previous attempt did nothing\nuseful, see d81269fecb8ce (\"io_uring: fix provide_buffers sign extension\").\n\nDo that with help of check_\u003cop\u003e_overflow helpers. And fix struct\nio_provide_buf::len type, as it doesn't make much sense to keep it\nsigned.","modified":"2026-03-13T05:17:58.918887Z","published":"2024-02-28T09:15:39.993Z","references":[{"type":"FIX","url":"https://git.kernel.org/stable/c/51bf90901952aaac564bbdb36b2b503050c53dd9"},{"type":"FIX","url":"https://git.kernel.org/stable/c/84b8c266c4bfe9ed5128e13253c388deb74b1b03"},{"type":"FIX","url":"https://git.kernel.org/stable/c/cbbc13b115b8f18e0a714d89f87fbdc499acfe2d"},{"type":"FIX","url":"https://git.kernel.org/stable/c/38134ada0ceea3e848fe993263c0ff6207fd46e7"}],"affected":[{"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2021-47040.json","unresolved_ranges":[{"events":[{"introduced":"5.8"},{"fixed":"5.10.37"}]},{"events":[{"introduced":"5.11"},{"fixed":"5.11.21"}]},{"events":[{"introduced":"5.12"},{"fixed":"5.12.4"}]}]}}],"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"}]}