What’s Vulnerable › Vulnerabilities

CVE-2026-74515: KVM: s390: pci: Reject adapter interrupt forwarding if already enabled

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-15 · updated 2026-10-16

Description

In the Linux kernel, the following vulnerability has been resolved: KVM: s390: pci: Reject adapter interrupt forwarding if already enabled The MPCIFC instruction doesn't allow registering adapter interrupts without first unregistering. So reject any request to enable interrupt forwarding if its already enabled for the zPCI device. This also fixes overwriting and thus leaking resources when the ioctl is called multiple times for the same device.

Affected products

• Linux kernel: 6.0 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux kernel 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/591952b63a9f976da7d49f719f36ec826ee2a575
• https://git.kernel.org/stable/c/642d2d1067f7c4d753ae0e3ba5bc98b43cfe3c70
• https://git.kernel.org/stable/c/6837f0ae85fd54cf64c8a0c7c530bba2fae0a207
• https://git.kernel.org/stable/c/6be1ff49ba81f96a6fa55915e6d920be43ac57cc
• https://git.kernel.org/stable/c/78d9648e7e960546d5b72504a0b0358cd8bb1e9d
• https://git.kernel.org/stable/c/8fa01be5a6149404adb82c0979a78f6347edd3ef

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