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Vulnerability · Published Aug 26, 2026 · Assigned by Linux

CVE-2026-80554s390/vfio_ccw: Limit the number of channel program segments

Critical 9.3

In plain English

A critical-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 4% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)9.3Critical
Exploit odds (30 days)0.1%top 96.4% 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: s390/vfio_ccw: Limit the number of channel program segments The processing of channel programs, and the CCWs within them, is done recursively. As such, there is an arbitrary (but not architectural) limit to the number of CCWs that can exist in a single channel program. The vfio-ccw logic breaks these channel programs into segments whenever it encounters a Transfer-In-Channel (TIC) CCW, and the combined number of segments count towards the global limit. Impose an equivalent limit to the number of segments until such logic can be made non-recursive.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linuxno fix listedDEBIAN-CVE-2026-80554
Debian:13linux6.12.105-1DEBIAN-CVE-2026-80554
Debian:14linux7.1.10-1DEBIAN-CVE-2026-80554
Debian:12linux-6.126.12.107-1~deb12u1DEBIAN-CVE-2026-80554
Ubuntu:22.04:LTSlinuxno fix listedUBUNTU-CVE-2026-80554
Ubuntu:24.04:LTSlinuxno fix listedUBUNTU-CVE-2026-80554
Ubuntu:26.04:LTSlinux7.0.0-42.42UBUNTU-CVE-2026-80554
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2026-80554
Ubuntu:22.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-80554
Ubuntu:24.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-80554
Ubuntu:26.04:LTSlinux-aws7.0.0-1016.17UBUNTU-CVE-2026-80554
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2026-80554
Ubuntu:24.04:LTSlinux-aws-6.14no fix listedUBUNTU-CVE-2026-80554
Ubuntu:24.04:LTSlinux-aws-6.17no fix listedUBUNTU-CVE-2026-80554
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2026-80554
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2026-80554
Ubuntu:22.04:LTSlinux-aws-6.8no fix listedUBUNTU-CVE-2026-80554
Ubuntu:24.04:LTSlinux-aws-7.0no fix listedUBUNTU-CVE-2026-80554
Ubuntu:22.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-80554
Ubuntu:24.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-80554
Ubuntu:26.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-80554
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2026-80554
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2026-80554
Ubuntu:24.04:LTSlinux-azure-6.14no fix listedUBUNTU-CVE-2026-80554
Ubuntu:24.04:LTSlinux-azure-6.17no fix listedUBUNTU-CVE-2026-80554
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2026-80554
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2026-80554
Ubuntu:22.04:LTSlinux-azure-6.8no fix listedUBUNTU-CVE-2026-80554
Ubuntu:24.04:LTSlinux-azure-7.0no fix listedUBUNTU-CVE-2026-80554
Ubuntu:22.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-80554
Ubuntu:24.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-80554
Ubuntu:26.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-80554
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2026-80554
Ubuntu:24.04:LTSlinux-azure-fde-6.14no fix listedUBUNTU-CVE-2026-80554
Ubuntu:24.04:LTSlinux-azure-fde-6.17no fix listedUBUNTU-CVE-2026-80554
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2026-80554
Ubuntu:22.04:LTSlinux-azure-fde-6.8no fix listedUBUNTU-CVE-2026-80554
Ubuntu:24.04:LTSlinux-azure-fde-7.0no fix listedUBUNTU-CVE-2026-80554
Ubuntu:24.04:LTSlinux-azure-nvidiano fix listedUBUNTU-CVE-2026-80554
Ubuntu:24.04:LTSlinux-azure-nvidia-6.14no fix listedUBUNTU-CVE-2026-80554
Ubuntu:22.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-80554
Ubuntu:24.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-80554
Ubuntu:26.04:LTSlinux-gcp7.0.0-1016.18UBUNTU-CVE-2026-80554
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2026-80554
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2026-80554
Ubuntu:24.04:LTSlinux-gcp-6.14no fix listedUBUNTU-CVE-2026-80554
Ubuntu:24.04:LTSlinux-gcp-6.17no fix listedUBUNTU-CVE-2026-80554
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2026-80554
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2026-80554
Ubuntu:22.04:LTSlinux-gcp-6.8no fix listedUBUNTU-CVE-2026-80554
Ubuntu:24.04:LTSlinux-gcp-7.0no fix listedUBUNTU-CVE-2026-80554
Ubuntu:22.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-80554
Ubuntu:24.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-80554
Ubuntu:26.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-80554
Ubuntu:22.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2026-80554
Ubuntu:24.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2026-80554
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2026-80554
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2026-80554
Ubuntu:24.04:LTSlinux-hwe-6.14no fix listedUBUNTU-CVE-2026-80554
Ubuntu:24.04:LTSlinux-hwe-6.17no fix listedUBUNTU-CVE-2026-80554
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2026-80554
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2026-80554
Ubuntu:22.04:LTSlinux-hwe-6.8no fix listedUBUNTU-CVE-2026-80554
Ubuntu:24.04:LTSlinux-hwe-7.07.0.0-42.42~24.04.1UBUNTU-CVE-2026-80554
Ubuntu:22.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-80554
Ubuntu:24.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-80554
Ubuntu:26.04:LTSlinux-ibm7.0.0-1017.17UBUNTU-CVE-2026-80554
Ubuntu:22.04:LTSlinux-ibm-6.8no fix listedUBUNTU-CVE-2026-80554
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2026-80554
Ubuntu:22.04:LTSlinux-intel-iotgno fix listedUBUNTU-CVE-2026-80554
Ubuntu:22.04:LTSlinux-kvmno fix listedUBUNTU-CVE-2026-80554
Ubuntu:22.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2026-80554
Ubuntu:24.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2026-80554
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2026-80554
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2026-80554
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2026-80554
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2026-80554
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.8no fix listedUBUNTU-CVE-2026-80554
Ubuntu:22.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-80554
Ubuntu:24.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-80554
Ubuntu:26.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-80554
Ubuntu:24.04:LTSlinux-nvidia-6.11no fix listedUBUNTU-CVE-2026-80554
Ubuntu:24.04:LTSlinux-nvidia-6.17no fix listedUBUNTU-CVE-2026-80554
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2026-80554
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2026-80554
Ubuntu:22.04:LTSlinux-nvidia-6.8no fix listedUBUNTU-CVE-2026-80554
Ubuntu:24.04:LTSlinux-nvidia-7.0no fix listedUBUNTU-CVE-2026-80554
Ubuntu:26.04:LTSlinux-nvidia-bosno fix listedUBUNTU-CVE-2026-80554
Ubuntu:24.04:LTSlinux-nvidia-lowlatencyno fix listedUBUNTU-CVE-2026-80554
Ubuntu:22.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2026-80554
Ubuntu:24.04:LTSlinux-nvidia-tegra6.8.0-1036.39UBUNTU-CVE-2026-80554
Ubuntu:22.04:LTSlinux-nvidia-tegra-igxno fix listedUBUNTU-CVE-2026-80554
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2026-80554
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2026-80554
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2026-80554
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2026-80554
Ubuntu:24.04:LTSlinux-oem-6.14no fix listedUBUNTU-CVE-2026-80554
Ubuntu:24.04:LTSlinux-oem-6.17no fix listedUBUNTU-CVE-2026-80554
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2026-80554
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2026-80554
Ubuntu:26.04:LTSlinux-oem-7.07.0.0-1017.17UBUNTU-CVE-2026-80554
Ubuntu:22.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-80554
Ubuntu:24.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-80554
Ubuntu:26.04:LTSlinux-oracle7.0.0-1015.16UBUNTU-CVE-2026-80554
Ubuntu:24.04:LTSlinux-oracle-6.14no fix listedUBUNTU-CVE-2026-80554
Ubuntu:24.04:LTSlinux-oracle-6.17no fix listedUBUNTU-CVE-2026-80554
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2026-80554
Ubuntu:22.04:LTSlinux-oracle-6.8no fix listedUBUNTU-CVE-2026-80554
Ubuntu:24.04:LTSlinux-oracle-7.0no fix listedUBUNTU-CVE-2026-80554
Ubuntu:22.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-80554
Ubuntu:24.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-80554
Ubuntu:26.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-80554
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2026-80554
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-80554
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-80554
Ubuntu:26.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-80554
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-80554
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-80554
Ubuntu:26.04:LTSlinux-riscv7.0.0-42.42.1UBUNTU-CVE-2026-80554
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2026-80554
Ubuntu:24.04:LTSlinux-riscv-6.14no fix listedUBUNTU-CVE-2026-80554
Ubuntu:24.04:LTSlinux-riscv-6.17no fix listedUBUNTU-CVE-2026-80554
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2026-80554
Ubuntu:22.04:LTSlinux-riscv-6.8no fix listedUBUNTU-CVE-2026-80554
Ubuntu:24.04:LTSlinux-riscv-7.07.0.0-42.42.1~24.04.1UBUNTU-CVE-2026-80554
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2026-80554
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2026-80554
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2026-80554
Ubuntu:24.04:LTSlinux-vmwareno fix listedUBUNTU-CVE-2026-80554
Ubuntu:24.04:LTSlinux-xilinxno fix listedUBUNTU-CVE-2026-80554
Ubuntu:22.04:LTSlinux-xilinx-zynqmpno fix listedUBUNTU-CVE-2026-80554

Affected products (as reported)

VendorProductVersions
Linux Linux 0a19e61e6d4c6192077ead760ba0a2d350987d4c – before 2ce00bb19db13606cda79f4b7aae4d9775de30960a19e61e6d4c6192077ead760ba0a2d350987d4c – before 15fb4559a7fdf0b8725e433a71cfd03a1313a48b0a19e61e6d4c6192077ead760ba0a2d350987d4c – before a1625f66eaa1200068a0e2c05bc90e65182fc4e30a19e61e6d4c6192077ead760ba0a2d350987d4c – before 06f4d6e5a8af6c2072e8cd39dbc512c683ca7fb20a19e61e6d4c6192077ead760ba0a2d350987d4c – before 4ee94790490ae8dcc97df8597f07836c8a81bbcf0a19e61e6d4c6192077ead760ba0a2d350987d4c – before 5405c90d6a47b3014e74ee0618a162449abbbc93
Linux Linux 4.12

References