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.
References6
- git.kernel.org/stable/c/591952b63a9f976da7d49f719f36ec826ee2a575
- git.kernel.org/stable/c/642d2d1067f7c4d753ae0e3ba5bc98b43cfe3c70
- git.kernel.org/stable/c/6837f0ae85fd54cf64c8a0c7c530bba2fae0a207
- git.kernel.org/stable/c/6be1ff49ba81f96a6fa55915e6d920be43ac57cc
- git.kernel.org/stable/c/78d9648e7e960546d5b72504a0b0358cd8bb1e9d
- git.kernel.org/stable/c/8fa01be5a6149404adb82c0979a78f6347edd3ef
Metrics
- CVSS 3.1
-
8.8
HIGH
Score source: CNA
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H - EPSS — exploit probability
- 0% percentile: 3 · as of 11 November 2026
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.