# CVE-2026-98930: KVM: s390: Fix IRQ injection with SIGP Stop and Store Status

CVE-2026-98930 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-98930, released October 24, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-98930
- Priority: Routine
- CVSS: 4.4 (Moderate)
- EPSS: 0.0019
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 23, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-98930

## Description

In the Linux kernel, the following vulnerability has been resolved:  KVM: s390: Fix IRQ injection with SIGP Stop and Store Status  When __inject_sigp_stop() is called for a Stop and Store Status operation, if the vCPU is running, the interrupt is marked as pending and the status is stored by the thread performing the KVM_RUN IOCTL.  If the vCPU is already stopped, the status is stored immediately.  Storing the status means writing into userspace, which might fault, and __inject_sigp_stop() is called from do_inject_vcpu() which in turn is always called holding a spinlock, which is obviously an issue.  Fix this by returning -EWOULDBLOCK from __inject_sigp_stop(), and adding a bool flag to indicate whether a store status is needed. The callers of do_inject_vcpu() are modified to pass the pointer to the bool flag; whenever a Store Status operation is needed, the callers can now perform it outside the spinlock.  Opportunistically refactor kvm_s390_set_irq_state() to use scoped_guard() and __free().  [ Added Fixes tag while picking -- Claudio ]

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.12.113-1 | [DEBIAN-CVE-2026-98930](https://patchblox.com/security/data/fix/linux/debian-cve-2026-98930.md) | Oct 24, 2026 |
| Linux | linux Debian 14 | 7.2.9-1 | [DEBIAN-CVE-2026-98930](https://patchblox.com/security/data/fix/linux/debian-cve-2026-98930.md) | Oct 24, 2026 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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