{"id":"CVE-2026-98472","summary":"KVM: SEV: Free have_run_cpus during VM destruction even if VM is no longer SEV","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: SEV: Free have_run_cpus during VM destruction even if VM is no longer SEV\n\nUnconditionally free SEV's \"have run CPUs\" cpumask in the VM destroy path,\ni.e. even for what appear to be non-SEV VMs, as an SEV VM becomes a non-SEV\nVM if its state is intra-host migrated.  Alternatively, the mask could be\nfreed in sev_migrate_from() when \"converting\" the source VM, but that gets\nannoying because ideally KVM would nullify the mask to guard against UAF,\nand nullifying the mask would need be conditioned on CPUMASK_OFFSTACK=y.\n\nFreeing the mask during sev_migrate_from() is also not robust against other\nKVM bugs, though that's kind of a moot point since any such bugs would show\nup even if sev-\u003eactive is never set.  I.e. KVM must get that side of things\ncorrect.  But, that's not a great reason to add more code just to make\nthings marginally less robust.","modified":"2026-10-19T02:46:16.715295968Z","published":"2026-10-18T15:15:24.654Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98472.json","cna_assigner":"Linux"},"references":[{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"},{"type":"WEB","url":"https://git.kernel.org/stable/c/12c1f6e03f944e399bd2c88441dca5dc702b95a5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6aef7cf800098749ff5d660222efaf6e01e98c09"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9784e5ca91b37b387f3f414af4340c54f7a63566"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98472.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98472"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6f38f8c574642a822f2e85f079fa29a49176c49c"},{"fixed":"6aef7cf800098749ff5d660222efaf6e01e98c09"},{"fixed":"9784e5ca91b37b387f3f414af4340c54f7a63566"},{"fixed":"12c1f6e03f944e399bd2c88441dca5dc702b95a5"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98472.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.17.0"},{"fixed":"6.18.55"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.9"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98472.json"}}],"schema_version":"1.9.0"}