KVM: s390: Take srcu when importing watchpoint data (CVE-2026-89922) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-89922

KVM: s390: Take srcu when importing watchpoint data

Answer in brief

CVE-2026-89922 records a Unknown severity vulnerability in KVM: s390: Take srcu when importing watchpoint data. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 16, 2026Updated Sep 16, 2026Source checked Sep 16, 2026First seen by HOL Sep 16, 2026Material review Sep 16, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

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.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=27291e2165b6de70c476b7b675308113edd69a60 <6830fbc3724bf49c142aae69a4694f115fa9cedd \|\| >=27291e2165b6de70c476b7b675308113edd69a60 <f8e3a9997d5ecd56ebe4b262ff424516c068fecb \|\| >=27291e2165b6de70c476b7b675308113edd69a60 <76f5b4ea9ed0aa5a34bda9d8a878f2c73026ec03 \|\| >=27291e2165b6de70c476b7b675308113edd69a60 <cc710ee45395efb4937e042960f791d33924e5f6 \|\| >=27291e2165b6de70c476b7b675308113edd69a60 <4c05bf21d1806853e662cc19e744736a3408f155 \|\| >=27291e2165b6de70c476b7b675308113edd69a60 <a4e482def8533ebace517d9f67f1465841b1f982	6830fbc3724bf49c142aae69a4694f115fa9cedd, f8e3a9997d5ecd56ebe4b262ff424516c068fecb, 76f5b4ea9ed0aa5a34bda9d8a878f2c73026ec03, cc710ee45395efb4937e042960f791d33924e5f6, 4c05bf21d1806853e662cc19e744736a3408f155, a4e482def8533ebace517d9f67f1465841b1f982
Linux/Linuxgeneric	3.16	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 6830fbc3724bf49c142aae69a4694f115fa9cedd if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 16, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 16, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 16, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: KVM: s390: Take srcu when importing watchpoint data __import_wp_info() backs up the original guest memory contents of a watchpoint with read_guest_abs(), which is kvm_read_guest() and therefore resolves the memslot via __kvm_memslots(). That requires kvm->srcu (or kvm->slots_lock) to be held, otherwise a concurrent memslot update can free the memslots array under us once its SRCU grace period has elapsed. As this is not fast path, following lock ordering (mutex first, then srcu) take the big hammer and hold the srcu for the full import.

Quoted source text, attributed separately from HOL analysis.