{"id":"CVE-2021-46977","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: VMX: Disable preemption when probing user return MSRs\n\nDisable preemption when probing a user return MSR via RDSMR/WRMSR.  If\nthe MSR holds a different value per logical CPU, the WRMSR could corrupt\nthe host's value if KVM is preempted between the RDMSR and WRMSR, and\nthen rescheduled on a different CPU.\n\nOpportunistically land the helper in common x86, SVM will use the helper\nin a future commit.","modified":"2026-03-15T14:45:38.272561Z","published":"2024-02-28T09:15:37.140Z","references":[{"type":"FIX","url":"https://git.kernel.org/stable/c/31f29749ee970c251b3a7e5b914108425940d089"},{"type":"FIX","url":"https://git.kernel.org/stable/c/5104d7ffcf24749939bea7fdb5378d186473f890"},{"type":"FIX","url":"https://git.kernel.org/stable/c/5adcdeb57007ccf8ab7ac20bf787ffb6fafb1a94"},{"type":"FIX","url":"https://git.kernel.org/stable/c/e3ea1895df719c4ef87862501bb10d95f4177bed"}],"affected":[{"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-46977.json","unresolved_ranges":[{"events":[{"introduced":"5.5"},{"fixed":"5.10.38"}]},{"events":[{"introduced":"5.11"},{"fixed":"5.11.22"}]},{"events":[{"introduced":"5.12"},{"fixed":"5.12.5"}]},{"events":[{"introduced":"0"},{"last_affected":"5.13-rc1"}]}]}}],"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"}]}