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Vulnerability · Published Sep 4, 2026 · Assigned by Linux

CVE-2026-80891KVM: s390: pci: Validate AIBV and AISB before pinning guest pages

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 88.1% 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: pci: Validate AIBV and AISB before pinning guest pages The AIBV holds one bit per MSI-X vector for a given function. The size of the bit vector is derived from the NOI and the AIBVO. If the size of the AIBV exceeds a single page boundary, then reject the request as we cannot safely pin the guest AIBV. Similarly reject the request if the AISB address is not 8-byte aligned as the architecture requires doubleword alignment for the summary bit address. Since the AISBO can address up to 64 bits, the size of the AISB can only be 8 bytes for the function. This also ensures the AISB doesn't exceed a single page boundary.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux6.1.187-1DEBIAN-CVE-2026-80891
Debian:13linux6.12.105-1DEBIAN-CVE-2026-80891
Debian:14linux7.1.8-1DEBIAN-CVE-2026-80891
Debian:12linux-6.126.12.107-1~deb12u1DEBIAN-CVE-2026-80891
Ubuntu:22.04:LTSlinuxno fix listedUBUNTU-CVE-2026-80891
Ubuntu:24.04:LTSlinuxno fix listedUBUNTU-CVE-2026-80891
Ubuntu:26.04:LTSlinux7.0.0-42.42UBUNTU-CVE-2026-80891
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2026-80891
Ubuntu:22.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-80891
Ubuntu:24.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-80891
Ubuntu:26.04:LTSlinux-aws7.0.0-1016.17UBUNTU-CVE-2026-80891
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2026-80891
Ubuntu:24.04:LTSlinux-aws-6.14no fix listedUBUNTU-CVE-2026-80891
Ubuntu:24.04:LTSlinux-aws-6.17no fix listedUBUNTU-CVE-2026-80891
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2026-80891
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2026-80891
Ubuntu:22.04:LTSlinux-aws-6.8no fix listedUBUNTU-CVE-2026-80891
Ubuntu:24.04:LTSlinux-aws-7.0no fix listedUBUNTU-CVE-2026-80891
Ubuntu:22.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-80891
Ubuntu:24.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-80891
Ubuntu:26.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-80891
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2026-80891
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2026-80891
Ubuntu:24.04:LTSlinux-azure-6.14no fix listedUBUNTU-CVE-2026-80891
Ubuntu:24.04:LTSlinux-azure-6.17no fix listedUBUNTU-CVE-2026-80891
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2026-80891
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2026-80891
Ubuntu:22.04:LTSlinux-azure-6.8no fix listedUBUNTU-CVE-2026-80891
Ubuntu:24.04:LTSlinux-azure-7.0no fix listedUBUNTU-CVE-2026-80891
Ubuntu:22.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-80891
Ubuntu:24.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-80891
Ubuntu:26.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-80891
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2026-80891
Ubuntu:24.04:LTSlinux-azure-fde-6.14no fix listedUBUNTU-CVE-2026-80891
Ubuntu:24.04:LTSlinux-azure-fde-6.17no fix listedUBUNTU-CVE-2026-80891
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2026-80891
Ubuntu:22.04:LTSlinux-azure-fde-6.8no fix listedUBUNTU-CVE-2026-80891
Ubuntu:24.04:LTSlinux-azure-fde-7.0no fix listedUBUNTU-CVE-2026-80891
Ubuntu:24.04:LTSlinux-azure-nvidiano fix listedUBUNTU-CVE-2026-80891
Ubuntu:24.04:LTSlinux-azure-nvidia-6.14no fix listedUBUNTU-CVE-2026-80891
Ubuntu:22.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-80891
Ubuntu:24.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-80891
Ubuntu:26.04:LTSlinux-gcp7.0.0-1016.18UBUNTU-CVE-2026-80891
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2026-80891
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2026-80891
Ubuntu:24.04:LTSlinux-gcp-6.14no fix listedUBUNTU-CVE-2026-80891
Ubuntu:24.04:LTSlinux-gcp-6.17no fix listedUBUNTU-CVE-2026-80891
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2026-80891
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2026-80891
Ubuntu:22.04:LTSlinux-gcp-6.8no fix listedUBUNTU-CVE-2026-80891
Ubuntu:24.04:LTSlinux-gcp-7.0no fix listedUBUNTU-CVE-2026-80891
Ubuntu:22.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-80891
Ubuntu:24.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-80891
Ubuntu:26.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-80891
Ubuntu:22.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2026-80891
Ubuntu:24.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2026-80891
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2026-80891
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2026-80891
Ubuntu:24.04:LTSlinux-hwe-6.14no fix listedUBUNTU-CVE-2026-80891
Ubuntu:24.04:LTSlinux-hwe-6.17no fix listedUBUNTU-CVE-2026-80891
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2026-80891
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2026-80891
Ubuntu:22.04:LTSlinux-hwe-6.8no fix listedUBUNTU-CVE-2026-80891
Ubuntu:24.04:LTSlinux-hwe-7.07.0.0-42.42~24.04.1UBUNTU-CVE-2026-80891
Ubuntu:22.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-80891
Ubuntu:24.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-80891
Ubuntu:26.04:LTSlinux-ibm7.0.0-1017.17UBUNTU-CVE-2026-80891
Ubuntu:22.04:LTSlinux-ibm-6.8no fix listedUBUNTU-CVE-2026-80891
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2026-80891
Ubuntu:22.04:LTSlinux-intel-iotgno fix listedUBUNTU-CVE-2026-80891
Ubuntu:22.04:LTSlinux-kvmno fix listedUBUNTU-CVE-2026-80891
Ubuntu:22.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2026-80891
Ubuntu:24.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2026-80891
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2026-80891
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2026-80891
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2026-80891
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2026-80891
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.8no fix listedUBUNTU-CVE-2026-80891
Ubuntu:22.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-80891
Ubuntu:24.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-80891
Ubuntu:26.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-80891
Ubuntu:24.04:LTSlinux-nvidia-6.11no fix listedUBUNTU-CVE-2026-80891
Ubuntu:24.04:LTSlinux-nvidia-6.17no fix listedUBUNTU-CVE-2026-80891
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2026-80891
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2026-80891
Ubuntu:22.04:LTSlinux-nvidia-6.8no fix listedUBUNTU-CVE-2026-80891
Ubuntu:24.04:LTSlinux-nvidia-7.0no fix listedUBUNTU-CVE-2026-80891
Ubuntu:26.04:LTSlinux-nvidia-bosno fix listedUBUNTU-CVE-2026-80891
Ubuntu:24.04:LTSlinux-nvidia-lowlatencyno fix listedUBUNTU-CVE-2026-80891
Ubuntu:22.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2026-80891
Ubuntu:24.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2026-80891
Ubuntu:22.04:LTSlinux-nvidia-tegra-igxno fix listedUBUNTU-CVE-2026-80891
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2026-80891
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2026-80891
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2026-80891
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2026-80891
Ubuntu:24.04:LTSlinux-oem-6.14no fix listedUBUNTU-CVE-2026-80891
Ubuntu:24.04:LTSlinux-oem-6.17no fix listedUBUNTU-CVE-2026-80891
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2026-80891
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2026-80891
Ubuntu:26.04:LTSlinux-oem-7.07.0.0-1017.17UBUNTU-CVE-2026-80891
Ubuntu:22.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-80891
Ubuntu:24.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-80891
Ubuntu:26.04:LTSlinux-oracle7.0.0-1015.16UBUNTU-CVE-2026-80891
Ubuntu:24.04:LTSlinux-oracle-6.14no fix listedUBUNTU-CVE-2026-80891
Ubuntu:24.04:LTSlinux-oracle-6.17no fix listedUBUNTU-CVE-2026-80891
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2026-80891
Ubuntu:22.04:LTSlinux-oracle-6.8no fix listedUBUNTU-CVE-2026-80891
Ubuntu:24.04:LTSlinux-oracle-7.0no fix listedUBUNTU-CVE-2026-80891
Ubuntu:22.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-80891
Ubuntu:24.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-80891
Ubuntu:26.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-80891
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2026-80891
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-80891
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-80891
Ubuntu:26.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-80891
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-80891
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-80891
Ubuntu:26.04:LTSlinux-riscv7.0.0-42.42.1UBUNTU-CVE-2026-80891
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2026-80891
Ubuntu:24.04:LTSlinux-riscv-6.14no fix listedUBUNTU-CVE-2026-80891
Ubuntu:24.04:LTSlinux-riscv-6.17no fix listedUBUNTU-CVE-2026-80891
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2026-80891
Ubuntu:22.04:LTSlinux-riscv-6.8no fix listedUBUNTU-CVE-2026-80891
Ubuntu:24.04:LTSlinux-riscv-7.07.0.0-42.42.1~24.04.1UBUNTU-CVE-2026-80891
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2026-80891
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2026-80891
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2026-80891
Ubuntu:24.04:LTSlinux-vmwareno fix listedUBUNTU-CVE-2026-80891
Ubuntu:24.04:LTSlinux-xilinxno fix listedUBUNTU-CVE-2026-80891
Ubuntu:22.04:LTSlinux-xilinx-zynqmpno fix listedUBUNTU-CVE-2026-80891

Affected products (as reported)

VendorProductVersions
Linux Linux 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc – before 3a1c64220ede4ac9ef9a3e76f008ff60a34f4c483c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc – before f00ef8efd41440129ccd88f4a1ebebf8d61d297f3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc – before 15df7700dd99f8a37f5c6ed2dcf1e33009cdba473c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc – before b878ba7e28144c9a857bc847d31f3c45413450ac3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc – before fbfe683f8b1ae7e40b56bdd6daf5bd671bc3a5283c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc – before 868d32ac72cba21c5c6d8a66a814b7c25a3a5c01
Linux Linux 6.0

References