CVE-2026-74515: KVM: s390: pci: Reject adapter interrupt forwarding if already enabled
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 Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-74515?
CVE-2026-74515 has a risk rating of 27, indicating a moderate vulnerability that may impact system functionality.
How do I fix CVE-2026-74515?
To mitigate CVE-2026-74515, ensure that the Linux kernel is updated to a version that contains the patch for this vulnerability.
What systems are affected by CVE-2026-74515?
CVE-2026-74515 affects systems running the Linux kernel that utilize KVM on s390 architecture.
What type of vulnerability is CVE-2026-74515?
CVE-2026-74515 is a security issue related to incorrect handling of adapter interrupt forwarding in the Linux kernel.
When was CVE-2026-74515 published?
CVE-2026-74515 was published on August 15, 2026.