CVE-2025-21888
CSIRTS triage
- What
- A WARN condition occurs in deregister_mr for memory region operations of type DM.
- Who is affected
- Systems running Linux kernel with Mellanox InfiniBand/RDMA hardware.
- Urgency
- Medium severity with CVSS 5.5; not currently exploited but could trigger kernel warnings.
- Action
- Apply Linux kernel patch CVE-2025-21888 when available or update to a patched kernel version.
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Exploitation outlook
- Low exploitation risk0.19% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 9% of all EPSS-scored CVEs.
Advisory coverage (1)
- mediumCVE-2025-21888: RDMA/mlx5: Fix a WARN during dereg_mr for DM typemsrc · 2026-08-06
External references
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