CVE-2026-89921
Description
In the Linux kernel, the following vulnerability has been resolved: KVM: s390: Zero initialize data structures for inject_pfault_token __kvm_inject_pfault_token() only sets .type and .u.ext.ext_params2 of the on-stack struct kvm_s390_irq but the full ext substructure is copied into the cpu local variable on inject. ext_params and pad contain stale stack values. Interrupt delivery only uses ext_params2, so nothing leaks to the guest, but a host user can use the migration ioctls to get to the data. Fix by zero-initializing the irq struct. Do the same for the inti data structure.
How to fix
- Linux Linux3da26db3323cbccf509005fdbc4ebae842d323cd, 5b0ae4443383fbacd905522f0c95ad6c85a3b43e, 7090818ba774d254eba80979c2d4da23d91de02f, ab1a8a3c9971200938093370da4c67d4427c25f2, b8abc760fa18a389319d977834a30550b3ec18e8, 9b046de62b8098af6e2ba820b125ec9dc5f162c8, 134f235e0e8de54611a72d3cc3f63e5f31246baa, 4e2c7f7cbc27418f9a290399b986c1b85ff93b90 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 383d0b050106abecb82f43101cac94fa423af5cd ≤ v < 3da26db3323cbccf509005fdbc4ebae842d323cd, 383d0b050106abecb82f43101cac94fa423af5cd ≤ v < 5b0ae4443383fbacd905522f0c95ad6c85a3b43e, 383d0b050106abecb82f43101cac94fa423af5cd ≤ v < 7090818ba774d254eba80979c2d4da23d91de02f, 383d0b050106abecb82f43101cac94fa423af5cd ≤ v < ab1a8a3c9971200938093370da4c67d4427c25f2, 383d0b050106abecb82f43101cac94fa423af5cd ≤ v < b8abc760fa18a389319d977834a30550b3ec18e8, 383d0b050106abecb82f43101cac94fa423af5cd ≤ v < 9b046de62b8098af6e2ba820b125ec9dc5f162c8, 383d0b050106abecb82f43101cac94fa423af5cd ≤ v < 134f235e0e8de54611a72d3cc3f63e5f31246baa, 383d0b050106abecb82f43101cac94fa423af5cd ≤ v < 4e2c7f7cbc27418f9a290399b986c1b85ff93b90, 3.19 | 3da26db3323cbccf509005fdbc4ebae842d323cd, 5b0ae4443383fbacd905522f0c95ad6c85a3b43e, 7090818ba774d254eba80979c2d4da23d91de02f, ab1a8a3c9971200938093370da4c67d4427c25f2, b8abc760fa18a389319d977834a30550b3ec18e8, 9b046de62b8098af6e2ba820b125ec9dc5f162c8, 134f235e0e8de54611a72d3cc3f63e5f31246baa, 4e2c7f7cbc27418f9a290399b986c1b85ff93b90 |
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