# CVE-2026-98413: selinux: always fill AVC decision in avc_has_perm_noaudit()

> A flaw in the Linux kernel SELinux module allows uninitialized memory disclosure via AVC decisions, potentially leaking sensitive kernel data to local attackers.

- **Severity:** Not scored
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 14 Oct 2026
- **Updated:** 19 Oct 2026
- **Also known as:** AZL-108185, BELL-CVE-2026-98413, DEBIAN-CVE-2026-98413, GHSA-m3f9-pmfc-6c92, UBUNTU-CVE-2026-98413

## What is CVE-2026-98413?

CVE-2026-98413 is a vulnerability in Linux, published on 14 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

In the Linux kernel, the following vulnerability has been resolved:

selinux: always fill AVC decision in avc_has_perm_noaudit()

avc_has_perm_noaudit() is documented to return a copy of the access
decision in @avd, but its early return for an empty requested permission
set leaves the buffer untouched.  All callers pass an uninitialized
stack variable and afterwards feed it to avc_audit(), and the inode hook
even stores it in the per-task decision cache.

Fill in a deny-all, audit-all decision, similar to avd_init(), so every
caller receives a defined value at no cost on the hot path.

## Which versions are affected by CVE-2026-98413?


## How do I fix CVE-2026-98413?

Apply the vendor's patch.

## Is CVE-2026-98413 being exploited?

There is no known exploitation of CVE-2026-98413 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-98413 and fix it if it is affected.

What it is: CVE-2026-98413 is a vulnerability in Linux, published on 14 Oct 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-2026-98413 in the wild and no public exploit code.

Affected product: 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-2026-98413/ (Markdown: https://insights.sbomify.com/CVE-2026-98413/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-98413
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-98413
- OSV: https://osv.dev/vulnerability/CVE-2026-98413

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-98413/
Summaries are generated and may contain mistakes; the official description above is the record.