# CVE-2026-47333: Out-of-bounds read in Ubuntu Linux AppArmor notification handling

> An unprivileged local user can trigger a heap out-of-bounds read in AppArmor notification handling, potentially exposing sensitive data or causing system instability.

- **Severity:** High 7.8 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 28 May 2026
- **Updated:** 29 May 2026
- **Also known as:** GHSA-79jw-477r-jj6f, UBUNTU-CVE-2026-47333

## What is CVE-2026-47333?

CVE-2026-47333 is a high-severity memory corruption vulnerability in Canonical Ubuntu Linux, published on 28 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which can potentially incorrectly compute the size of an internal buffer, leading to a heap memory out-of-bounds read in notification handling code. The bug can be triggered by an unprivileged local user and can result in invalid data being processed by the AppArmor DFA policy engine.

Weakness: CWE-125 (Out-of-bounds Read)

## Which versions are affected by CVE-2026-47333?

It affects 1 product.


Products: Canonical Ubuntu Linux.

## How do I fix CVE-2026-47333?

Apply the vendor's patch.

## Is CVE-2026-47333 being exploited?

There is no known exploitation of CVE-2026-47333 in the wild and no public exploit code.

## Other vulnerabilities in Canonical Ubuntu Linux

- [CVE-2020-11651](https://insights.sbomify.com/CVE-2020-11651/): SaltStack Salt Authentication Bypass (critical 9.8, exploited in the wild)
- [CVE-2020-7247](https://insights.sbomify.com/CVE-2020-7247/): OpenSMTPD Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2019-16928](https://insights.sbomify.com/CVE-2019-16928/): Exim Out-of-bounds Write (critical 9.8, exploited in the wild)
- [CVE-2018-6789](https://insights.sbomify.com/CVE-2018-6789/): Exim Buffer Overflow (critical 9.8, exploited in the wild)
- [CVE-2015-2590](https://insights.sbomify.com/CVE-2015-2590/): Oracle Java SE and Java SE Embedded Remote Code Execution (critical 9.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-47333 and fix it if it is affected.

What it is: CVE-2026-47333 is a high-severity memory corruption vulnerability in Canonical Ubuntu Linux, published on 28 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-47333 in the wild and no public exploit code.

Affected product: Canonical Ubuntu Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-47333/ (Markdown: https://insights.sbomify.com/CVE-2026-47333/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-47333
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-47333
- OSV: https://osv.dev/vulnerability/CVE-2026-47333

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-47333/
Summaries are generated and may contain mistakes; the official description above is the record.