CVE-2026-74515 PUBLISHED

KVM: s390: pci: Reject adapter interrupt forwarding if already enabled

Assigner: Linux
Reserved: 15.08.2026 Published: 15.08.2026 Updated: 15.08.2026

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.

Product Status

Vendor Linux
Product Linux
Versions Default: unaffected
  • affected from 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc to 78d9648e7e960546d5b72504a0b0358cd8bb1e9d (excl.)
  • affected from 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc to 6be1ff49ba81f96a6fa55915e6d920be43ac57cc (excl.)
  • affected from 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc to 6837f0ae85fd54cf64c8a0c7c530bba2fae0a207 (excl.)
  • affected from 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc to 591952b63a9f976da7d49f719f36ec826ee2a575 (excl.)
  • affected from 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc to 8fa01be5a6149404adb82c0979a78f6347edd3ef (excl.)
Vendor Linux
Product Linux
Versions Default: affected
  • Version 6.0 is affected
  • unaffected from 0 to 6.0 (excl.)
  • unaffected from 6.6.151 to 6.6.* (incl.)
  • unaffected from 6.12.103 to 6.12.* (incl.)
  • unaffected from 6.18.44 to 6.18.* (incl.)
  • unaffected from 7.1.8 to 7.1.* (incl.)
  • unaffected from 7.2-rc6 to * (incl.)

References