{"id":"CVE-2026-89921","published":"2026-09-16T11:17:01.173","lastModified":"2026-09-16T11:17:01.173","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.","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/134f235e0e8de54611a72d3cc3f63e5f31246baa","tags":[]},{"url":"https://git.kernel.org/stable/c/4e2c7f7cbc27418f9a290399b986c1b85ff93b90","tags":[]},{"url":"https://git.kernel.org/stable/c/9b046de62b8098af6e2ba820b125ec9dc5f162c8","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}