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…
Published: 2026-08-15 · CVSS: 8.8 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7