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CVE-2026-74515

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

HIGH
8.8
CVSS Score
Published: August 15, 2026 at 12:27 PM UTC
Updated: October 16, 2026 at 08:17 PM UTC
1 product affected across 1 vendorLinux Kernel

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Severity
HIGH8.8
Exploit prediction
EPSS 0.1%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel· Linux
90%
3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc6.0
Vendor states this is fixed in 591952b63a9f976da7d49f719f36ec826ee2a575 (fixed)
Vendor states this is fixed in 642d2d1067f7c4d753ae0e3ba5bc98b43cfe3c70 (fixed)
Vendor states this is fixed in 6837f0ae85fd54cf64c8a0c7c530bba2fae0a207 (fixed)
Vendor states this is fixed in 6be1ff49ba81f96a6fa55915e6d920be43ac57cc (fixed)
Vendor states this is fixed in 78d9648e7e960546d5b72504a0b0358cd8bb1e9d (fixed)
Vendor states this is fixed in 8fa01be5a6149404adb82c0979a78f6347edd3ef (fixed)
Vendor states this is fixed in 6.0 (unaffected)
Vendor states this is fixed in 6.1.183 (unaffected)
Vendor states this is fixed in 6.12.103 (unaffected)
Vendor states this is fixed in 6.18.44 (unaffected)
Vendor states this is fixed in 6.6.151 (unaffected)
Vendor states this is fixed in 7.1.8 (unaffected)
Vendor states this is fixed in 7.2 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (6)

Source: cverecord
https://git.kernel.org/stable/c/78d9648e7e960546d5b72504a0b0358cd8bb1e9d
Source: cverecord
https://git.kernel.org/stable/c/6be1ff49ba81f96a6fa55915e6d920be43ac57cc
Source: cverecord
https://git.kernel.org/stable/c/6837f0ae85fd54cf64c8a0c7c530bba2fae0a207
Source: cverecord
https://git.kernel.org/stable/c/591952b63a9f976da7d49f719f36ec826ee2a575
Source: cverecord
https://git.kernel.org/stable/c/8fa01be5a6149404adb82c0979a78f6347edd3ef
Source: cverecord
https://git.kernel.org/stable/c/642d2d1067f7c4d753ae0e3ba5bc98b43cfe3c70

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.8HIGHLinux
Vector?

Quick Info

StatusRECEIVED

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