リリース

KubeVirt v1.8.4 is a patch release fixing a gRPC connection leak in virt-handler that caused memory growth, patching CVE-2026-35469 in spdystream, and adding missing metrics/alerts.

• securityPatch CVE-2026-35469 by upgrading to v1.8.4

  The moby/spdystream dependency carried CVE-2026-35469 (GHSA-pc3f-x583-g7j2). If you're on any v1.8.x release before v1.8.4, upgrade now. Check your internal scanner results for this CVE to confirm exposure before and after the upgrade.

• breakinggRPC connection leak fix may change virt-handler resource footprint

  The connection leak in GetLauncherClient caused unbounded memory and goroutine growth when multiple controllers raced on the same VMI. After upgrading, virt-handler memory usage should drop noticeably in clusters with high VMI churn. If you have memory-based alerts or resource limits tuned to the leaked baseline, revisit those thresholds post-upgrade.

• enhancementNew metrics and alerts for virt components — update dashboards

  Missing metrics, recording rules, and alerts were added for virt components. Review what's new against your existing Prometheus/Alertmanager setup and add any new alerts to your runbooks. This is a good time to audit alert coverage gaps you may have been living with.

KubeVirt v1.8.3 is a patch release with 75 fixes targeting security, authorization, live migration stability, and GPU/DRA device handling — all worth deploying promptly.

• securityPatch CVE and symlink traversal — upgrade now

  Two security issues demand attention: a gRPC CVE (GHSA-p77j-4mvh-x3m3) and a symlink traversal in the VMExport dir handler. Both are fixed in this release. If you use VMExport or expose VM data externally, treat this upgrade as urgent. Verify no malicious symlinks exist in existing VMExport directories before and after upgrading.

• breakingRecording rule renames — update dashboards and alerts before upgrading

  kubevirt_vm_created_total and kubevirt_vm_created_by_pod_total are deprecated outright, and multiple other recording rules are being renamed for naming convention compliance. If your Grafana dashboards, alerting rules, or SLO queries reference these metrics, they will silently stop matching after upgrade. Audit your observability stack now and migrate to the new names before rolling this out to production.

• enhancementLive migration is more reliable — especially on IPv6 and cross-namespace setups

  Several live migration bugs are resolved here: cross-namespace migration on IPv6 clusters now works, duplicate kubevirt_vmi_info series no longer break VirtualMachineStuckOnNode and VMCannotBeEvicted alerts, and GuestAgentPing probes no longer cause spurious pod restarts during migration. If you've been avoiding live migration in IPv6 or multi-namespace environments due to instability, this release clears those blockers.

KubeVirt v1.7.4 is a patch release fixing a CVE in gRPC, authorization bugs, live migration on IPv6, and probe-triggered pod restarts during VM lifecycle events.

• securityPatch CVE-2026-33186 by upgrading to v1.7.4 now

  The gRPC dependency was vulnerable to CVE-2026-33186. This is a direct dependency bump to 1.79.3, so upgrading your KubeVirt installation to v1.7.4 is the only required action — no configuration changes needed. Prioritize this if your cluster runs workloads exposed to untrusted input over gRPC.

• breakingAudit authorization if you use VNC, SEV, or evacuate subresources

  The SubjectAccessReview truncation bug meant RBAC checks were being evaluated against incorrect subresource names — which could have allowed access that should have been denied, or denied access that should have been allowed. After upgrading, verify that your RBAC policies for vnc/screenshot, sev/*, and evacuate/cancel subresources behave as intended. This is not just a security fix; it's a correctness fix for authorization logic.

• enhancementVMs using GuestAgentPing probes during migrations or pauses should no longer bounce

  If you've been seeing unexpected virt-launcher pod restarts during live migrations or VM pause operations, this was a known probe behavior issue. The fix suppresses false-positive probe failures during pre-copy target, post-copy source, user pause, snapshot, save, and dump states. No action required — just upgrade. If you had workarounds in place (e.g., disabling GuestAgentPing during migrations), you can now remove them.

KubeVirt v1.6.6 is a patch release fixing 9 notable bugs including a CVE remediation, authorization bypass in virt-api, and broken cross-namespace live migration on IPv6 clusters.

• securityPatch CVE-2026-33186 by upgrading to v1.6.6

  The grpc dependency was bumped to remediate CVE-2026-33186. If your KubeVirt deployment exposes gRPC endpoints or you're running in a multi-tenant cluster, this is the main reason to push this upgrade now. Check your current version and plan the rollout — this is a patch release so the upgrade path should be straightforward.

• securityFix incorrect SubjectAccessReview checks in virt-api — audit your RBAC

  virt-api was constructing SubjectAccessReviews with truncated subresource names for deep paths like vnc/screenshot and sev/*. This means authorization checks were running against wrong resource names, potentially allowing or denying access incorrectly. After upgrading, audit any RBAC policies that restrict access to VNC, SEV, or evacuation subresources to confirm they behave as intended.

• breakingIPv6 clusters: cross-namespace live migration was silently broken — verify after upgrade

  If you're running KubeVirt on an IPv6 cluster and rely on cross-namespace live migrations, those migrations were failing. This fix restores the expected behavior. After upgrading, run a test migration across namespaces in your IPv6 environment to confirm the fix holds before relying on it in production workflows.

• enhancementPCI hostdev users on mixed machine types: restart reliability improved

  VMs using PCI passthrough hostdevices were failing to restart after hotplugging a block volume. The root cause was PCI topology being gated only on architecture, not machine type. If you manage VMs with PCI hostdevices and have seen unexplained restart failures post-hotplug, this patch resolves it — no config change needed, just the upgrade.

KubeVirt v1.6.4 is a patch release with 108 changes targeting stability: a CVE fix in crypto, several hotplug/migration bugs squashed, and new vCPU queue alerting.

• securityPatch CVE-2025-47913 — upgrade to v1.6.4 now

  CVE-2025-47913 affects the golang/x/crypto dependency. This release pins it to OpenShift's patched fork. If you're running any v1.6.x release before v1.6.4, you're exposed. Upgrade immediately — no workaround exists short of patching the binary yourself.

• breakingCross-vendor live migrations are now blocked

  KubeVirt will now explicitly prevent live migrations between nodes with different CPU vendors (e.g., Intel to AMD). If your cluster has mixed CPU vendors and you've been relying on cross-vendor migration — intentionally or not — audit your node topology before upgrading. Migrations that previously succeeded may now fail with an error.

• enhancementAdd vCPU queue alerts to your monitoring setup

  Two new alerts ship in this release: GuestPeakVCPUQueueHighWarning and GuestPeakVCPUQueueHighCritical. If you're running KubeVirt with Prometheus, check that these alerts are picked up by your alerting rules. They give you early warning on guest CPU starvation, which is otherwise invisible until VMs start misbehaving under load.

KubeVirt v1.7.1 delivers critical bug fixes for live migration, volume hotplug, and VM snapshot operations, along with enhanced monitoring capabilities and security updates.

• securityUpdate to address crypto dependency vulnerabilities

  The golang.org/x/crypto dependency was updated to v0.45.0 to address security issues. Plan to upgrade to this version promptly, especially in production environments handling sensitive workloads, as crypto vulnerabilities can impact VM security.

• breakingCross-vendor migration prevention requires review

  KubeVirt now prevents cross-vendor migrations which may break existing workflows that rely on migrating VMs between different infrastructure providers. Review your migration patterns and ensure source and target nodes use compatible virtualization stacks.

• enhancementImplement ephemeral volume monitoring

  New metrics and alerts for ephemeral hotplug volumes improve operational visibility. Configure your monitoring stack to capture these new metrics and set up alerts for ephemeral volume lifecycle events to better track resource usage and potential issues.