Answer in brief
CVE-2026-89921 records a Unknown severity vulnerability in KVM: s390: Zero initialize data structures for inject_pfault_token. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=383d0b050106abecb82f43101cac94fa423af5cd <b8abc760fa18a389319d977834a30550b3ec18e8 || >=383d0b050106abecb82f43101cac94fa423af5cd <9b046de62b8098af6e2ba820b125ec9dc5f162c8 || >=383d0b050106abecb82f43101cac94fa423af5cd <134f235e0e8de54611a72d3cc3f63e5f31246baa || >=383d0b050106abecb82f43101cac94fa423af5cd <4e2c7f7cbc27418f9a290399b986c1b85ff93b90 | b8abc760fa18a389319d977834a30550b3ec18e8, 9b046de62b8098af6e2ba820b125ec9dc5f162c8, 134f235e0e8de54611a72d3cc3f63e5f31246baa, 4e2c7f7cbc27418f9a290399b986c1b85ff93b90 |
| Linux/Linuxgeneric | 3.19 | Not reported |
| Linux/Linuxgeneric | >=383d0b050106abecb82f43101cac94fa423af5cd <9b046de62b8098af6e2ba820b125ec9dc5f162c8 || >=383d0b050106abecb82f43101cac94fa423af5cd <134f235e0e8de54611a72d3cc3f63e5f31246baa || >=383d0b050106abecb82f43101cac94fa423af5cd <4e2c7f7cbc27418f9a290399b986c1b85ff93b90 | 9b046de62b8098af6e2ba820b125ec9dc5f162c8, 134f235e0e8de54611a72d3cc3f63e5f31246baa, 4e2c7f7cbc27418f9a290399b986c1b85ff93b90 |
| Linux/Linuxgeneric | >=383d0b050106abecb82f43101cac94fa423af5cd <ab1a8a3c9971200938093370da4c67d4427c25f2 || >=383d0b050106abecb82f43101cac94fa423af5cd <b8abc760fa18a389319d977834a30550b3ec18e8 || >=383d0b050106abecb82f43101cac94fa423af5cd <9b046de62b8098af6e2ba820b125ec9dc5f162c8 || >=383d0b050106abecb82f43101cac94fa423af5cd <134f235e0e8de54611a72d3cc3f63e5f31246baa || >=383d0b050106abecb82f43101cac94fa423af5cd <4e2c7f7cbc27418f9a290399b986c1b85ff93b90 | ab1a8a3c9971200938093370da4c67d4427c25f2, b8abc760fa18a389319d977834a30550b3ec18e8, 9b046de62b8098af6e2ba820b125ec9dc5f162c8, 134f235e0e8de54611a72d3cc3f63e5f31246baa, 4e2c7f7cbc27418f9a290399b986c1b85ff93b90 |
| Linux/Linuxgeneric | >=383d0b050106abecb82f43101cac94fa423af5cd <3da26db3323cbccf509005fdbc4ebae842d323cd || >=383d0b050106abecb82f43101cac94fa423af5cd <5b0ae4443383fbacd905522f0c95ad6c85a3b43e || >=383d0b050106abecb82f43101cac94fa423af5cd <7090818ba774d254eba80979c2d4da23d91de02f || >=383d0b050106abecb82f43101cac94fa423af5cd <ab1a8a3c9971200938093370da4c67d4427c25f2 || >=383d0b050106abecb82f43101cac94fa423af5cd <b8abc760fa18a389319d977834a30550b3ec18e8 || >=383d0b050106abecb82f43101cac94fa423af5cd <9b046de62b8098af6e2ba820b125ec9dc5f162c8 || >=383d0b050106abecb82f43101cac94fa423af5cd <134f235e0e8de54611a72d3cc3f63e5f31246baa || >=383d0b050106abecb82f43101cac94fa423af5cd <4e2c7f7cbc27418f9a290399b986c1b85ff93b90 | 3da26db3323cbccf509005fdbc4ebae842d323cd, 5b0ae4443383fbacd905522f0c95ad6c85a3b43e, 7090818ba774d254eba80979c2d4da23d91de02f, ab1a8a3c9971200938093370da4c67d4427c25f2, b8abc760fa18a389319d977834a30550b3ec18e8, 9b046de62b8098af6e2ba820b125ec9dc5f162c8, 134f235e0e8de54611a72d3cc3f63e5f31246baa, 4e2c7f7cbc27418f9a290399b986c1b85ff93b90 |
Published upstream
Sep 16, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 30, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 16, 2026
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.
Quoted source text, attributed separately from HOL analysis.