{"api_version":"1","generated_at":"2026-09-17T06:06:49+00:00","cve":"CVE-2026-89921","urls":{"html":"https://cve.report/CVE-2026-89921","api":"https://cve.report/api/cve/CVE-2026-89921.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-89921","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-89921"},"summary":{"title":"KVM: s390: Zero initialize data structures for inject_pfault_token","description":"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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-16 11:17:01","updated_at":"2026-09-16 11:17:01"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/4e2c7f7cbc27418f9a290399b986c1b85ff93b90","name":"https://git.kernel.org/stable/c/4e2c7f7cbc27418f9a290399b986c1b85ff93b90","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9b046de62b8098af6e2ba820b125ec9dc5f162c8","name":"https://git.kernel.org/stable/c/9b046de62b8098af6e2ba820b125ec9dc5f162c8","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/134f235e0e8de54611a72d3cc3f63e5f31246baa","name":"https://git.kernel.org/stable/c/134f235e0e8de54611a72d3cc3f63e5f31246baa","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89921","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89921","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 383d0b050106abecb82f43101cac94fa423af5cd 9b046de62b8098af6e2ba820b125ec9dc5f162c8 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 383d0b050106abecb82f43101cac94fa423af5cd 134f235e0e8de54611a72d3cc3f63e5f31246baa git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 383d0b050106abecb82f43101cac94fa423af5cd 4e2c7f7cbc27418f9a290399b986c1b85ff93b90 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3.19","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 3.19 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.52 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.5 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["arch/s390/kvm/kvm-s390.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"9b046de62b8098af6e2ba820b125ec9dc5f162c8","status":"affected","version":"383d0b050106abecb82f43101cac94fa423af5cd","versionType":"git"},{"lessThan":"134f235e0e8de54611a72d3cc3f63e5f31246baa","status":"affected","version":"383d0b050106abecb82f43101cac94fa423af5cd","versionType":"git"},{"lessThan":"4e2c7f7cbc27418f9a290399b986c1b85ff93b90","status":"affected","version":"383d0b050106abecb82f43101cac94fa423af5cd","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["arch/s390/kvm/kvm-s390.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"3.19"},{"lessThan":"3.19","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.52","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.5","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.52","versionStartIncluding":"3.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.5","versionStartIncluding":"3.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc1","versionStartIncluding":"3.19","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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."}],"providerMetadata":{"dateUpdated":"2026-09-16T10:32:15.413Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/9b046de62b8098af6e2ba820b125ec9dc5f162c8"},{"url":"https://git.kernel.org/stable/c/134f235e0e8de54611a72d3cc3f63e5f31246baa"},{"url":"https://git.kernel.org/stable/c/4e2c7f7cbc27418f9a290399b986c1b85ff93b90"}],"title":"KVM: s390: Zero initialize data structures for inject_pfault_token","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-89921","datePublished":"2026-09-16T10:32:15.413Z","dateReserved":"2026-09-11T19:38:34.775Z","dateUpdated":"2026-09-16T10:32:15.413Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-16 11:17:01","lastModifiedDate":"2026-09-16 11:17:01","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"89921","Ordinal":"1","Title":"KVM: s390: Zero initialize data structures for inject_pfault_tok","CVE":"CVE-2026-89921","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"89921","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"KVM: s390: Zero initialize data structures for inject_pfault_tok"}]}}}