# CVE-2026-68454: KVM: s390: pci: Fix handling of AIF enable without AISB

> A null pointer dereference in KVM s390 PCI handling allows a guest to cause a kernel crash by registering IRQs without a summary bit.

- **Severity:** High 8.8 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/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:** 13 Aug 2026
- **Updated:** 19 Oct 2026
- **Also known as:** BELL-CVE-2026-68454, DEBIAN-CVE-2026-68454, GHSA-4h5w-742q-hw8j, UBUNTU-CVE-2026-68454

## What is CVE-2026-68454?

CVE-2026-68454 is a high-severity vulnerability in Linux, published on 13 Aug 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:

KVM: s390: pci: Fix handling of AIF enable without AISB

When a guest seeks to register IRQs without a summary bit specified,
ensure that the associated GAITE then stores 0 for the guest AISB
location instead of virt_to_phys(page_address(NULL)).

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2026-68454?


## How do I fix CVE-2026-68454?

Apply the vendor's patch.

## Is CVE-2026-68454 being exploited?

There is no known exploitation of CVE-2026-68454 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-68454 and fix it if it is affected.

What it is: CVE-2026-68454 is a high-severity vulnerability in Linux, published on 13 Aug 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-2026-68454 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-2026-68454/ (Markdown: https://insights.sbomify.com/CVE-2026-68454/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-68454
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-68454
- OSV: https://osv.dev/vulnerability/CVE-2026-68454

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-68454/
Summaries are generated and may contain mistakes; the official description above is the record.