{"id":"CVE-2021-47567","details":"In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/32: Fix hardlockup on vmap stack overflow\n\nSince the commit c118c7303ad5 (\"powerpc/32: Fix vmap stack - Do not\nactivate MMU before reading task struct\") a vmap stack overflow\nresults in a hard lockup. This is because emergency_ctx is still\naddressed with its virtual address allthough data MMU is not active\nanymore at that time.\n\nFix it by using a physical address instead.","modified":"2026-03-15T22:43:15.568445Z","published":"2024-05-24T15:15:21.837Z","references":[{"type":"FIX","url":"https://git.kernel.org/stable/c/dfe906da9a1abebdebe8b15bb3e66a2578f6c4c7"},{"type":"FIX","url":"https://git.kernel.org/stable/c/5bb60ea611db1e04814426ed4bd1c95d1487678e"},{"type":"FIX","url":"https://git.kernel.org/stable/c/c4e3ff8b8b1d54f0c755670174c453b06e17114b"}],"affected":[{"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-47567.json","unresolved_ranges":[{"events":[{"introduced":"5.9.5"},{"fixed":"5.10.83"}]},{"events":[{"introduced":"5.11"},{"fixed":"5.15.6"}]},{"events":[{"introduced":"0"},{"last_affected":"5.16-rc1"}]},{"events":[{"introduced":"0"},{"last_affected":"5.16-rc2"}]}]}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}