Vulnerability · Published Aug 15, 2026 · Assigned by Linux

CVE-2026-74515KVM: s390: pci: Reject adapter interrupt forwarding if already enabled

High 8.8

In plain English

A high-severity security flaw in Linux from Linux. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 3% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.8High
Exploit odds (30 days)0.1%top 97.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:8bpftool4.18.0-553.179.1.el8_10ALSA-2026:89816
AlmaLinux:10kernel6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:8kernel4.18.0-553.179.1.el8_10ALSA-2026:89816
AlmaLinux:9kernel5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-64k6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:9kernel-64k5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-64k-core6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:9kernel-64k-core5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-64k-debug6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:9kernel-64k-debug5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-64k-debug-core6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:9kernel-64k-debug-core5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-64k-debug-devel6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:9kernel-64k-debug-devel5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-64k-debug-devel-matched6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:9kernel-64k-debug-devel-matched5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-64k-debug-modules6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:9kernel-64k-debug-modules5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-64k-debug-modules-core6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:9kernel-64k-debug-modules-core5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-64k-debug-modules-extra6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:9kernel-64k-debug-modules-extra5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-64k-devel6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:9kernel-64k-devel5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-64k-devel-matched6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:9kernel-64k-devel-matched5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-64k-modules6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:9kernel-64k-modules5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-64k-modules-core6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:9kernel-64k-modules-core5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-64k-modules-extra6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:9kernel-64k-modules-extra5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-abi-stablelists6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:8kernel-abi-stablelists4.18.0-553.179.1.el8_10ALSA-2026:89816
AlmaLinux:9kernel-abi-stablelists5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-core6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:8kernel-core4.18.0-553.179.1.el8_10ALSA-2026:89816
AlmaLinux:9kernel-core5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-cross-headers6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:8kernel-cross-headers4.18.0-553.179.1.el8_10ALSA-2026:89816
AlmaLinux:9kernel-cross-headers5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-debug6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:8kernel-debug4.18.0-553.179.1.el8_10ALSA-2026:89816
AlmaLinux:9kernel-debug5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-debug-core6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:8kernel-debug-core4.18.0-553.179.1.el8_10ALSA-2026:89816
AlmaLinux:9kernel-debug-core5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-debug-devel6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:8kernel-debug-devel4.18.0-553.179.1.el8_10ALSA-2026:89816
AlmaLinux:9kernel-debug-devel5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-debug-devel-matched6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:9kernel-debug-devel-matched5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-debug-modules6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:8kernel-debug-modules4.18.0-553.179.1.el8_10ALSA-2026:89816
AlmaLinux:9kernel-debug-modules5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-debug-modules-core6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:9kernel-debug-modules-core5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-debug-modules-extra6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:8kernel-debug-modules-extra4.18.0-553.179.1.el8_10ALSA-2026:89816
AlmaLinux:9kernel-debug-modules-extra5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-debug-uki-virt6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:9kernel-debug-uki-virt5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-devel6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:8kernel-devel4.18.0-553.179.1.el8_10ALSA-2026:89816
AlmaLinux:9kernel-devel5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-devel-matched6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:9kernel-devel-matched5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-doc6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:8kernel-doc4.18.0-553.179.1.el8_10ALSA-2026:89816
AlmaLinux:9kernel-doc5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-headers6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:8kernel-headers4.18.0-553.179.1.el8_10ALSA-2026:89816
AlmaLinux:9kernel-headers5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-modules6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:8kernel-modules4.18.0-553.179.1.el8_10ALSA-2026:89816
AlmaLinux:9kernel-modules5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-modules-core6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:9kernel-modules-core5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-modules-extra6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:8kernel-modules-extra4.18.0-553.179.1.el8_10ALSA-2026:89816
AlmaLinux:9kernel-modules-extra5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-modules-extra-matched6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:10kernel-rt6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:8kernel-rt4.18.0-553.179.1.rt7.520.el8_10ALSA-2026:89814
AlmaLinux:9kernel-rt5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-rt-64k6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:9kernel-rt-64k5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-rt-64k-core6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:9kernel-rt-64k-core5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-rt-64k-debug6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:9kernel-rt-64k-debug5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-rt-64k-debug-core6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:9kernel-rt-64k-debug-core5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-rt-64k-debug-devel6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:9kernel-rt-64k-debug-devel5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-rt-64k-debug-modules6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:9kernel-rt-64k-debug-modules5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-rt-64k-debug-modules-core6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:9kernel-rt-64k-debug-modules-core5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-rt-64k-debug-modules-extra6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:9kernel-rt-64k-debug-modules-extra5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-rt-64k-devel6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:9kernel-rt-64k-devel5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-rt-64k-modules6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:9kernel-rt-64k-modules5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-rt-64k-modules-core6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:9kernel-rt-64k-modules-core5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-rt-64k-modules-extra6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:9kernel-rt-64k-modules-extra5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-rt-core6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:8kernel-rt-core4.18.0-553.179.1.rt7.520.el8_10ALSA-2026:89814
AlmaLinux:9kernel-rt-core5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-rt-debug6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:8kernel-rt-debug4.18.0-553.179.1.rt7.520.el8_10ALSA-2026:89814
AlmaLinux:9kernel-rt-debug5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-rt-debug-core6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:8kernel-rt-debug-core4.18.0-553.179.1.rt7.520.el8_10ALSA-2026:89814
AlmaLinux:9kernel-rt-debug-core5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-rt-debug-devel6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:8kernel-rt-debug-devel4.18.0-553.179.1.rt7.520.el8_10ALSA-2026:89814
AlmaLinux:9kernel-rt-debug-devel5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-rt-debug-modules6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:8kernel-rt-debug-modules4.18.0-553.179.1.rt7.520.el8_10ALSA-2026:89814
AlmaLinux:9kernel-rt-debug-modules5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-rt-debug-modules-core6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:9kernel-rt-debug-modules-core5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-rt-debug-modules-extra6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:8kernel-rt-debug-modules-extra4.18.0-553.179.1.rt7.520.el8_10ALSA-2026:89814
AlmaLinux:9kernel-rt-debug-modules-extra5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-rt-devel6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:8kernel-rt-devel4.18.0-553.179.1.rt7.520.el8_10ALSA-2026:89814
AlmaLinux:9kernel-rt-devel5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-rt-modules6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:8kernel-rt-modules4.18.0-553.179.1.rt7.520.el8_10ALSA-2026:89814
AlmaLinux:9kernel-rt-modules5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-rt-modules-core6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:9kernel-rt-modules-core5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-rt-modules-extra6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:8kernel-rt-modules-extra4.18.0-553.179.1.rt7.520.el8_10ALSA-2026:89814
AlmaLinux:9kernel-rt-modules-extra5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-tools6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:8kernel-tools4.18.0-553.179.1.el8_10ALSA-2026:89816
AlmaLinux:9kernel-tools5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-tools-libs6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:8kernel-tools-libs4.18.0-553.179.1.el8_10ALSA-2026:89816
AlmaLinux:9kernel-tools-libs5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-tools-libs-devel6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:8kernel-tools-libs-devel4.18.0-553.179.1.el8_10ALSA-2026:89816
AlmaLinux:9kernel-tools-libs-devel5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-uki-virt6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:9kernel-uki-virt5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-uki-virt-addons6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:9kernel-uki-virt-addons5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-zfcpdump6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:8kernel-zfcpdump4.18.0-553.179.1.el8_10ALSA-2026:89816
AlmaLinux:9kernel-zfcpdump5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-zfcpdump-core6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:8kernel-zfcpdump-core4.18.0-553.179.1.el8_10ALSA-2026:89816
AlmaLinux:9kernel-zfcpdump-core5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-zfcpdump-devel6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:8kernel-zfcpdump-devel4.18.0-553.179.1.el8_10ALSA-2026:89816
AlmaLinux:9kernel-zfcpdump-devel5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-zfcpdump-devel-matched6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:9kernel-zfcpdump-devel-matched5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-zfcpdump-modules6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:8kernel-zfcpdump-modules4.18.0-553.179.1.el8_10ALSA-2026:89816
AlmaLinux:9kernel-zfcpdump-modules5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-zfcpdump-modules-core6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:9kernel-zfcpdump-modules-core5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10kernel-zfcpdump-modules-extra6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:8kernel-zfcpdump-modules-extra4.18.0-553.179.1.el8_10ALSA-2026:89816
AlmaLinux:9kernel-zfcpdump-modules-extra5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10libperf6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:9libperf5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10perf6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:8perf4.18.0-553.179.1.el8_10ALSA-2026:89816
AlmaLinux:9perf5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10python3-perf6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:8python3-perf4.18.0-553.179.1.el8_10ALSA-2026:89816
AlmaLinux:9python3-perf5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10rtla6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:9rtla5.14.0-687.61.1.el9_8ALSA-2026:90365
AlmaLinux:10rv6.12.0-211.69.1.el10_2ALSA-2026:91565
AlmaLinux:9rv5.14.0-687.61.1.el9_8ALSA-2026:90365
Debian:12linux6.1.187-1DEBIAN-CVE-2026-74515
Debian:13linux6.12.105-1DEBIAN-CVE-2026-74515
Debian:14linux7.1.8-1DEBIAN-CVE-2026-74515
Debian:12linux-6.126.12.107-1~deb12u1DEBIAN-CVE-2026-74515
Rocky Linux:10kernel0:6.12.0-211.69.1.el10_2RLSA-2026:91565
Rocky Linux:8kernel0:4.18.0-553.179.1.el8_10RLSA-2026:89816
Rocky Linux:9kernel0:5.14.0-687.61.1.el9_8.cloud.1.0RXSA-2026:90365
Rocky Linux:9kernel0:5.14.0-687.61.1.el9_8RLSA-2026:90365
Rocky Linux:8kernel-rt0:4.18.0-553.179.1.rt7.520.el8_10RLSA-2026:89814
Ubuntu:22.04:LTSlinuxno fix listedUBUNTU-CVE-2026-74515
Ubuntu:24.04:LTSlinuxno fix listedUBUNTU-CVE-2026-74515
Ubuntu:26.04:LTSlinux7.0.0-42.42UBUNTU-CVE-2026-74515
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2026-74515
Ubuntu:22.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-74515
Ubuntu:24.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-74515
Ubuntu:26.04:LTSlinux-aws7.0.0-1016.17UBUNTU-CVE-2026-74515

Affected products (as reported)

VendorProductVersions
Linux Linux 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc – before 642d2d1067f7c4d753ae0e3ba5bc98b43cfe3c703c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc – before 78d9648e7e960546d5b72504a0b0358cd8bb1e9d3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc – before 6be1ff49ba81f96a6fa55915e6d920be43ac57cc3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc – before 6837f0ae85fd54cf64c8a0c7c530bba2fae0a2073c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc – before 591952b63a9f976da7d49f719f36ec826ee2a5753c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc – before 8fa01be5a6149404adb82c0979a78f6347edd3ef
Linux Linux 6.0

References