{"id":"CVE-2021-46993","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nsched: Fix out-of-bound access in uclamp\n\nUtil-clamp places tasks in different buckets based on their clamp values\nfor performance reasons. However, the size of buckets is currently\ncomputed using a rounding division, which can lead to an off-by-one\nerror in some configurations.\n\nFor instance, with 20 buckets, the bucket size will be 1024/20=51. A\ntask with a clamp of 1024 will be mapped to bucket id 1024/51=20. Sadly,\ncorrect indexes are in range [0,19], hence leading to an out of bound\nmemory access.\n\nClamp the bucket id to fix the issue.","modified":"2026-03-15T22:42:43.561732Z","published":"2024-02-28T09:15:37.880Z","references":[{"type":"FIX","url":"https://git.kernel.org/stable/c/f7347c85490b92dd144fa1fba9e1eca501656ab3"},{"type":"FIX","url":"https://git.kernel.org/stable/c/3da3f804b82a0a382d523a21acf4cf3bb35f936d"},{"type":"FIX","url":"https://git.kernel.org/stable/c/42ee47c7e3569d9a0e2cb5053c496d97d380472f"},{"type":"FIX","url":"https://git.kernel.org/stable/c/687f523c134b7f0bd040ee1230f6d17990d54172"},{"type":"FIX","url":"https://git.kernel.org/stable/c/6d2f8909a5fabb73fe2a63918117943986c39b6c"}],"affected":[{"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-46993.json","unresolved_ranges":[{"events":[{"introduced":"5.3"},{"fixed":"5.4.120"}]},{"events":[{"introduced":"5.5"},{"fixed":"5.10.38"}]},{"events":[{"introduced":"5.11"},{"fixed":"5.11.22"}]},{"events":[{"introduced":"5.12"},{"fixed":"5.12.5"}]}]}}],"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:N/A:H"}]}