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Vulnerability · Published Sep 16, 2026 · Assigned by Linux

CVE-2026-89921KVM: s390: Zero initialize data structures for inject_pfault_token

Unrated

In plain English

A 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 0.2% (higher than 12% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS )–Not rated
Exploit odds (30 days)0.2%top 87.8% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

In the Linux kernel, the following vulnerability has been resolved: KVM: s390: Zero initialize data structures for inject_pfault_token __kvm_inject_pfault_token() only sets .type and .u.ext.ext_params2 of the on-stack struct kvm_s390_irq but the full ext substructure is copied into the cpu local variable on inject. ext_params and pad contain stale stack values. Interrupt delivery only uses ext_params2, so nothing leaks to the guest, but a host user can use the migration ioctls to get to the data. Fix by zero-initializing the irq struct. Do the same for the inti data structure.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linuxno fix listedDEBIAN-CVE-2026-89921
Debian:13linux6.12.113-1DEBIAN-CVE-2026-89921
Debian:14linux7.2.6-1DEBIAN-CVE-2026-89921
Debian:12linux-6.126.12.113-1~deb12u1DEBIAN-CVE-2026-89921
Ubuntu:22.04:LTSlinuxno fix listedUBUNTU-CVE-2026-89921
Ubuntu:24.04:LTSlinuxno fix listedUBUNTU-CVE-2026-89921
Ubuntu:26.04:LTSlinux7.0.0-42.42UBUNTU-CVE-2026-89921
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2026-89921
Ubuntu:22.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-89921
Ubuntu:24.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-89921
Ubuntu:26.04:LTSlinux-aws7.0.0-1016.17UBUNTU-CVE-2026-89921
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2026-89921
Ubuntu:24.04:LTSlinux-aws-6.14no fix listedUBUNTU-CVE-2026-89921
Ubuntu:24.04:LTSlinux-aws-6.17no fix listedUBUNTU-CVE-2026-89921
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2026-89921
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2026-89921
Ubuntu:22.04:LTSlinux-aws-6.8no fix listedUBUNTU-CVE-2026-89921
Ubuntu:24.04:LTSlinux-aws-7.0no fix listedUBUNTU-CVE-2026-89921
Ubuntu:22.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-89921
Ubuntu:24.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-89921
Ubuntu:26.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-89921
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2026-89921
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2026-89921
Ubuntu:24.04:LTSlinux-azure-6.14no fix listedUBUNTU-CVE-2026-89921
Ubuntu:24.04:LTSlinux-azure-6.17no fix listedUBUNTU-CVE-2026-89921
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2026-89921
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2026-89921
Ubuntu:22.04:LTSlinux-azure-6.8no fix listedUBUNTU-CVE-2026-89921
Ubuntu:24.04:LTSlinux-azure-7.0no fix listedUBUNTU-CVE-2026-89921
Ubuntu:22.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-89921
Ubuntu:24.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-89921
Ubuntu:26.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-89921
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2026-89921
Ubuntu:24.04:LTSlinux-azure-fde-6.14no fix listedUBUNTU-CVE-2026-89921
Ubuntu:24.04:LTSlinux-azure-fde-6.17no fix listedUBUNTU-CVE-2026-89921
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2026-89921
Ubuntu:22.04:LTSlinux-azure-fde-6.8no fix listedUBUNTU-CVE-2026-89921
Ubuntu:24.04:LTSlinux-azure-fde-7.0no fix listedUBUNTU-CVE-2026-89921
Ubuntu:24.04:LTSlinux-azure-nvidiano fix listedUBUNTU-CVE-2026-89921
Ubuntu:24.04:LTSlinux-azure-nvidia-6.14no fix listedUBUNTU-CVE-2026-89921
Ubuntu:22.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-89921
Ubuntu:24.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-89921
Ubuntu:26.04:LTSlinux-gcp7.0.0-1016.18UBUNTU-CVE-2026-89921
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2026-89921
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2026-89921
Ubuntu:24.04:LTSlinux-gcp-6.14no fix listedUBUNTU-CVE-2026-89921
Ubuntu:24.04:LTSlinux-gcp-6.17no fix listedUBUNTU-CVE-2026-89921
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2026-89921
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2026-89921
Ubuntu:22.04:LTSlinux-gcp-6.8no fix listedUBUNTU-CVE-2026-89921
Ubuntu:24.04:LTSlinux-gcp-7.0no fix listedUBUNTU-CVE-2026-89921
Ubuntu:22.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-89921
Ubuntu:24.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-89921
Ubuntu:26.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-89921
Ubuntu:22.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2026-89921
Ubuntu:24.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2026-89921
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2026-89921
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2026-89921
Ubuntu:24.04:LTSlinux-hwe-6.14no fix listedUBUNTU-CVE-2026-89921
Ubuntu:24.04:LTSlinux-hwe-6.17no fix listedUBUNTU-CVE-2026-89921
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2026-89921
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2026-89921
Ubuntu:22.04:LTSlinux-hwe-6.8no fix listedUBUNTU-CVE-2026-89921
Ubuntu:24.04:LTSlinux-hwe-7.07.0.0-42.42~24.04.1UBUNTU-CVE-2026-89921
Ubuntu:22.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-89921
Ubuntu:24.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-89921
Ubuntu:26.04:LTSlinux-ibm7.0.0-1017.17UBUNTU-CVE-2026-89921
Ubuntu:22.04:LTSlinux-ibm-6.8no fix listedUBUNTU-CVE-2026-89921
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2026-89921
Ubuntu:22.04:LTSlinux-intel-iotgno fix listedUBUNTU-CVE-2026-89921
Ubuntu:22.04:LTSlinux-kvmno fix listedUBUNTU-CVE-2026-89921
Ubuntu:22.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2026-89921
Ubuntu:24.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2026-89921
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2026-89921
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2026-89921
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2026-89921
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2026-89921
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.8no fix listedUBUNTU-CVE-2026-89921
Ubuntu:22.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-89921
Ubuntu:24.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-89921
Ubuntu:26.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-89921
Ubuntu:24.04:LTSlinux-nvidia-6.11no fix listedUBUNTU-CVE-2026-89921
Ubuntu:24.04:LTSlinux-nvidia-6.17no fix listedUBUNTU-CVE-2026-89921
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2026-89921
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2026-89921
Ubuntu:22.04:LTSlinux-nvidia-6.8no fix listedUBUNTU-CVE-2026-89921
Ubuntu:24.04:LTSlinux-nvidia-7.0no fix listedUBUNTU-CVE-2026-89921
Ubuntu:26.04:LTSlinux-nvidia-bosno fix listedUBUNTU-CVE-2026-89921
Ubuntu:24.04:LTSlinux-nvidia-lowlatencyno fix listedUBUNTU-CVE-2026-89921
Ubuntu:22.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2026-89921
Ubuntu:24.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2026-89921
Ubuntu:22.04:LTSlinux-nvidia-tegra-igxno fix listedUBUNTU-CVE-2026-89921
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2026-89921
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2026-89921
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2026-89921
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2026-89921
Ubuntu:24.04:LTSlinux-oem-6.14no fix listedUBUNTU-CVE-2026-89921
Ubuntu:24.04:LTSlinux-oem-6.17no fix listedUBUNTU-CVE-2026-89921
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2026-89921
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2026-89921
Ubuntu:26.04:LTSlinux-oem-7.07.0.0-1017.17UBUNTU-CVE-2026-89921
Ubuntu:22.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-89921
Ubuntu:24.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-89921
Ubuntu:26.04:LTSlinux-oracle7.0.0-1015.16UBUNTU-CVE-2026-89921
Ubuntu:24.04:LTSlinux-oracle-6.14no fix listedUBUNTU-CVE-2026-89921
Ubuntu:24.04:LTSlinux-oracle-6.17no fix listedUBUNTU-CVE-2026-89921
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2026-89921
Ubuntu:22.04:LTSlinux-oracle-6.8no fix listedUBUNTU-CVE-2026-89921
Ubuntu:24.04:LTSlinux-oracle-7.0no fix listedUBUNTU-CVE-2026-89921
Ubuntu:22.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-89921
Ubuntu:24.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-89921
Ubuntu:26.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-89921
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2026-89921
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-89921
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-89921
Ubuntu:26.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-89921
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-89921
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-89921
Ubuntu:26.04:LTSlinux-riscv7.0.0-42.42.1UBUNTU-CVE-2026-89921
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2026-89921
Ubuntu:24.04:LTSlinux-riscv-6.14no fix listedUBUNTU-CVE-2026-89921
Ubuntu:24.04:LTSlinux-riscv-6.17no fix listedUBUNTU-CVE-2026-89921
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2026-89921
Ubuntu:22.04:LTSlinux-riscv-6.8no fix listedUBUNTU-CVE-2026-89921
Ubuntu:24.04:LTSlinux-riscv-7.07.0.0-42.42.1~24.04.1UBUNTU-CVE-2026-89921
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2026-89921
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2026-89921
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2026-89921
Ubuntu:24.04:LTSlinux-vmwareno fix listedUBUNTU-CVE-2026-89921
Ubuntu:24.04:LTSlinux-xilinxno fix listedUBUNTU-CVE-2026-89921
Ubuntu:22.04:LTSlinux-xilinx-zynqmpno fix listedUBUNTU-CVE-2026-89921

Affected products (as reported)

VendorProductVersions
Linux Linux 383d0b050106abecb82f43101cac94fa423af5cd – before 3da26db3323cbccf509005fdbc4ebae842d323cd383d0b050106abecb82f43101cac94fa423af5cd – before 5b0ae4443383fbacd905522f0c95ad6c85a3b43e383d0b050106abecb82f43101cac94fa423af5cd – before 7090818ba774d254eba80979c2d4da23d91de02f383d0b050106abecb82f43101cac94fa423af5cd – before ab1a8a3c9971200938093370da4c67d4427c25f2383d0b050106abecb82f43101cac94fa423af5cd – before b8abc760fa18a389319d977834a30550b3ec18e8383d0b050106abecb82f43101cac94fa423af5cd – before 9b046de62b8098af6e2ba820b125ec9dc5f162c8383d0b050106abecb82f43101cac94fa423af5cd – before 134f235e0e8de54611a72d3cc3f63e5f31246baa383d0b050106abecb82f43101cac94fa423af5cd – before 4e2c7f7cbc27418f9a290399b986c1b85ff93b90
Linux Linux 3.19

References