OpenStack Nova: Nova scheduler hint injection bypasses Placement resource claims and scheduling constraints
- When
- Where
- Global (internet)
- Category
- cyber_advisory · pip
## Affects - Nova: >=18.0.0 <31.3.1, >=32.0.0 <32.2.1, >=33.0.0 <33.0.2 ## Description Erichen from the Institute of Computing Technology, Chinese Academy of Sciences reported that Nova's server create API does not strip internal scheduler hints. An authenticated user can bypass Placement resource claims and scheduling constraint enforcement, including availability zone, host aggregate, and image trait restrictions. The resulting instance has no Placement allocation, which can lead to compute node resource exhaustion and cross-tenant data persistence on NVMe devices after instance deletion. Deployments running Nova 18.0.0 or later are affected. ## Patches - https://review.opendev.org/993604 (2025.1/epoxy) - https://review.opendev.org/993603 (2025.2/flamingo) - https://review.opendev.org/993602 (2026.1/gazpacho) - https://review.opendev.org/993601 (2026.2/hibiscus) ## Credits - Erichen from Institute of Computing Technology, Chinese Academy of Sciences (CVE-2026-46448)
Sources
- GitHub Advisory Database ↗ · first seen 2026-06-16 21:32 UTC
Defaxon links out to the original reporting and never republishes article text.
Correlated events
Computed by the Defaxon correlation engine — linked by shared actors, co-location, and temporal proximity. Scored hypotheses, never causal claims.
No correlated events found in the current window. As more events arrive, connections form automatically.