{"id":"CVE-2026-89921","summary":"KVM: s390: Zero initialize data structures for inject_pfault_token","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: s390: Zero initialize data structures for inject_pfault_token\n\n__kvm_inject_pfault_token() only sets .type and .u.ext.ext_params2 of\nthe on-stack struct kvm_s390_irq but the full ext substructure is copied\ninto the cpu local variable on inject. ext_params and pad contain stale\nstack values.\n\nInterrupt delivery only uses ext_params2, so nothing leaks to the guest,\nbut a host user can use the migration ioctls to get to the data.\n\nFix by zero-initializing the irq struct.\nDo the same for the inti data structure.","modified":"2026-09-17T03:47:10.605582696Z","published":"2026-09-16T10:32:15.413Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89921.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/134f235e0e8de54611a72d3cc3f63e5f31246baa"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4e2c7f7cbc27418f9a290399b986c1b85ff93b90"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9b046de62b8098af6e2ba820b125ec9dc5f162c8"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89921.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89921"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"383d0b050106abecb82f43101cac94fa423af5cd"},{"fixed":"9b046de62b8098af6e2ba820b125ec9dc5f162c8"},{"fixed":"134f235e0e8de54611a72d3cc3f63e5f31246baa"},{"fixed":"4e2c7f7cbc27418f9a290399b986c1b85ff93b90"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89921.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.19.0"},{"fixed":"6.18.52"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.5"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89921.json"}}],"schema_version":"1.9.0"}