{"id":"CVE-2026-89921","state":"PUBLISHED","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.","publishedAt":"2026-09-16T10:32:15.413Z","updatedAt":"2026-10-30T12:33:27.039Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"383d0b050106abecb82f43101cac94fa423af5cd","status":"affected","lessThan":"3da26db3323cbccf509005fdbc4ebae842d323cd","versionType":"git"},{"version":"383d0b050106abecb82f43101cac94fa423af5cd","status":"affected","lessThan":"5b0ae4443383fbacd905522f0c95ad6c85a3b43e","versionType":"git"},{"version":"383d0b050106abecb82f43101cac94fa423af5cd","status":"affected","lessThan":"7090818ba774d254eba80979c2d4da23d91de02f","versionType":"git"},{"version":"383d0b050106abecb82f43101cac94fa423af5cd","status":"affected","lessThan":"ab1a8a3c9971200938093370da4c67d4427c25f2","versionType":"git"},{"version":"383d0b050106abecb82f43101cac94fa423af5cd","status":"affected","lessThan":"b8abc760fa18a389319d977834a30550b3ec18e8","versionType":"git"},{"version":"383d0b050106abecb82f43101cac94fa423af5cd","status":"affected","lessThan":"9b046de62b8098af6e2ba820b125ec9dc5f162c8","versionType":"git"},{"version":"383d0b050106abecb82f43101cac94fa423af5cd","status":"affected","lessThan":"134f235e0e8de54611a72d3cc3f63e5f31246baa","versionType":"git"},{"version":"383d0b050106abecb82f43101cac94fa423af5cd","status":"affected","lessThan":"4e2c7f7cbc27418f9a290399b986c1b85ff93b90","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/s390/kvm/kvm-s390.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.19","versionType":"semver"},{"version":"5.10.273","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.224","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.112","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.52","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.5","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/s390/kvm/kvm-s390.c"]}],"references":["https://git.kernel.org/stable/c/3da26db3323cbccf509005fdbc4ebae842d323cd","https://git.kernel.org/stable/c/5b0ae4443383fbacd905522f0c95ad6c85a3b43e","https://git.kernel.org/stable/c/7090818ba774d254eba80979c2d4da23d91de02f","https://git.kernel.org/stable/c/ab1a8a3c9971200938093370da4c67d4427c25f2","https://git.kernel.org/stable/c/b8abc760fa18a389319d977834a30550b3ec18e8","https://git.kernel.org/stable/c/9b046de62b8098af6e2ba820b125ec9dc5f162c8","https://git.kernel.org/stable/c/134f235e0e8de54611a72d3cc3f63e5f31246baa","https://git.kernel.org/stable/c/4e2c7f7cbc27418f9a290399b986c1b85ff93b90"],"weaknesses":[],"ingestedAt":"2026-10-30T12:52:04.348Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/89xxx/CVE-2026-89921.json","commit":"1f312381e38164a43607eebab851b151dd16861e","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-89921","state":"PUBLISHED","datePublished":"2026-09-16T10:32:15.413Z","dateUpdated":"2026-10-30T12:33:27.039Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-11T19:38:34.775Z"},"containers":{"cna":{"title":"KVM: s390: Zero initialize data structures for inject_pfault_token","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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"383d0b050106abecb82f43101cac94fa423af5cd","status":"affected","lessThan":"3da26db3323cbccf509005fdbc4ebae842d323cd","versionType":"git"},{"version":"383d0b050106abecb82f43101cac94fa423af5cd","status":"affected","lessThan":"5b0ae4443383fbacd905522f0c95ad6c85a3b43e","versionType":"git"},{"version":"383d0b050106abecb82f43101cac94fa423af5cd","status":"affected","lessThan":"7090818ba774d254eba80979c2d4da23d91de02f","versionType":"git"},{"version":"383d0b050106abecb82f43101cac94fa423af5cd","status":"affected","lessThan":"ab1a8a3c9971200938093370da4c67d4427c25f2","versionType":"git"},{"version":"383d0b050106abecb82f43101cac94fa423af5cd","status":"affected","lessThan":"b8abc760fa18a389319d977834a30550b3ec18e8","versionType":"git"},{"version":"383d0b050106abecb82f43101cac94fa423af5cd","status":"affected","lessThan":"9b046de62b8098af6e2ba820b125ec9dc5f162c8","versionType":"git"},{"version":"383d0b050106abecb82f43101cac94fa423af5cd","status":"affected","lessThan":"134f235e0e8de54611a72d3cc3f63e5f31246baa","versionType":"git"},{"version":"383d0b050106abecb82f43101cac94fa423af5cd","status":"affected","lessThan":"4e2c7f7cbc27418f9a290399b986c1b85ff93b90","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/s390/kvm/kvm-s390.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.19","versionType":"semver"},{"version":"5.10.273","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.224","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.112","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.52","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.5","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/s390/kvm/kvm-s390.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/3da26db3323cbccf509005fdbc4ebae842d323cd"},{"url":"https://git.kernel.org/stable/c/5b0ae4443383fbacd905522f0c95ad6c85a3b43e"},{"url":"https://git.kernel.org/stable/c/7090818ba774d254eba80979c2d4da23d91de02f"},{"url":"https://git.kernel.org/stable/c/ab1a8a3c9971200938093370da4c67d4427c25f2"},{"url":"https://git.kernel.org/stable/c/b8abc760fa18a389319d977834a30550b3ec18e8"},{"url":"https://git.kernel.org/stable/c/9b046de62b8098af6e2ba820b125ec9dc5f162c8"},{"url":"https://git.kernel.org/stable/c/134f235e0e8de54611a72d3cc3f63e5f31246baa"},{"url":"https://git.kernel.org/stable/c/4e2c7f7cbc27418f9a290399b986c1b85ff93b90"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:33:27.039Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"5.10.273"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"5.15.224"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"6.12.112"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"6.18.52"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"7.2.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}