Bug 2517006 (CVE-2026-74515) - CVE-2026-74515 kernel: KVM: s390: pci: Reject adapter interrupt forwarding if already enabled
Summary: CVE-2026-74515 kernel: KVM: s390: pci: Reject adapter interrupt forwarding if...
Keywords:
Status: NEW
Alias: CVE-2026-74515
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-08-15 12:44 UTC by OSIDB Bzimport
Modified: 2026-08-21 12:01 UTC (History)
2 users (show)

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Description OSIDB Bzimport 2026-08-15 12:44:24 UTC 
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.
Comment 1 Mauro Matteo Cascella 2026-08-21 09:00:12 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026081543-CVE-2026-74515-dcb8@gregkh/T
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