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CVE-2026-89921

KVM: s390: Zero initialize data structures for inject_pfault_token

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 6.6.160, 6.12.112, 6.18.52, 7.2.5
None on Exploit-DB, Metasploit or GitHub

Summary

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.

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    Version range not reported

  • Linux Linux

    3.19

  • KernelLinux

    From 3.19.0 · fixed in 6.6.160; From 6.7.0 · fixed in 6.12.112; From 6.13.0 · fixed in 6.18.52; From 6.19.0 · fixed in 7.2.5

References 8

git.kernel.org