CVE-2026-89921

Not scored yetLast modified Oct 30, 2026

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.

Metrics

No CVSS score has been published yet.

Affected software

Source: the vendor's advisory (CNA). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 383d0b050106abecb82f43101cac94fa423af5cd, < 3da26db3323cbccf509005fdbc4ebae842d323cd; >= 383d0b050106abecb82f43101cac94fa423af5cd, < 5b0ae4443383fbacd905522f0c95ad6c85a3b43e; >= 383d0b050106abecb82f43101cac94fa423af5cd, < 7090818ba774d254eba80979c2d4da23d91de02f; >= 383d0b050106abecb82f43101cac94fa423af5cd, < ab1a8a3c9971200938093370da4c67d4427c25f2; >= 383d0b050106abecb82f43101cac94fa423af5cd, < b8abc760fa18a389319d977834a30550b3ec18e8; >= 383d0b050106abecb82f43101cac94fa423af5cd, < 9b046de62b8098af6e2ba820b125ec9dc5f162c8; >= 383d0b050106abecb82f43101cac94fa423af5cd, < 134f235e0e8de54611a72d3cc3f63e5f31246baa; >= 383d0b050106abecb82f43101cac94fa423af5cd, < 4e2c7f7cbc27418f9a290399b986c1b85ff93b90
LinuxLinux3.19

References

Timeline

Published
Sep 16, 2026
Last modified
Oct 30, 2026
NVD status
Received

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CVE-2026-89921: Unscored | Vulnix