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Vulnerabilities

Vulnerability · CVE-2026-74515

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

Published Aug 15, 2026 · catalog updated Oct 26, 2026 · KVM: s390: pci: Reject

Last checked Oct 29, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-74515. EPSS is 0.13%. Act only if a listed version of KVM: s390: pci: Reject is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (KVM: s390: pci: Reject).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.13%
Remediation
Advisory link
Affected products
Linux Kernel

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • Linux Kernel6.0.0 → 6.1.183; 6.2.0 → 6.6.151; 6.7.0 → 6.12.103

How to fix CVE-2026-74515

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-74515. EPSS is 0.13%. Act only if a listed version of KVM: s390: pci: Reject is installed.

Which versions are affected?

Compare what you have installed with Kernel 6.0.0 → 6.1.183; 6.2.0 → 6.6.151; 6.7.0 → 6.12.103. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.13%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Aug 15, 2026 · OpenSSF OSV / OSV Scanner

    Detected

    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 ioc

  2. Oct 26, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    Kernel fixed in 6.1.183; Kernel fixed in 6.6.151; Kernel fixed in 6.12.103; Kernel fixed in 6.18.44

  3. Oct 26, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    Kernel fixed in 6.1.183; 6.2.0

  4. Oct 26, 2026 · OpenSSF OSV / OSV Scanner

    Updated

    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 ioc

Sources

References

Freshness

Last verified in this catalog Oct 29, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • CVE.orgOct 27, 2026
  • BSI CERT-BundOct 27, 2026
  • OpenSSF OSV / OSV ScannerOct 26, 2026