CSIRTS // UNIFIED SECURITY ADVISORY FEEDSYS ● ONLINE · POWERED BY INTELFUSIONS.COM

← Back to feed

CVE-2026-45973: RDMA/mlx5: Fix UMR hang in LAG error state unload

mediumCVSS 5.5CVE-2026-45973

CSIRTS triage

vendor: Linuxproduct: Linux kernelMemory corruption
What
RDMA mlx5 driver can hang when processing UMR (User Memory Region) operations during LAG (Link Aggregation Group) error state unload.
Who is affected
Systems using Mellanox RDMA mlx5 hardware with LAG configuration enabled.
Urgency
Medium priority; causes service hang in specific error conditions, affecting RDMA-dependent applications.
Action
Apply Linux kernel patch fixing UMR hang in LAG error state, or update to a patched kernel version.

AI-assisted analysis generated from the source advisory — verify against the original.

⚡ Watch Linux kernel

Get an email when a new Linux kernel advisory drops — max one per day, one-click unsubscribe.

Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
medium — CVSS 5.5
Published
2026-08-06
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45973

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-45973coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for RDMA/mlx5

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

More from Microsoft Security Response Center