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Vulnerability · Published Oct 14, 2026 · Assigned by Linux

CVE-2026-98403s390/boot: Avoid IPL parameter append past command line

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 11% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS )–Not rated
Exploit odds (30 days)0.2%top 89.4% 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: s390/boot: Avoid IPL parameter append past command line A command line may occupy all but the terminating byte of COMMAND_LINE_SIZE. In that case append_ipl_block_parm() passes a zero size to the IPL parameter conversion helpers and points the destination one byte past early_command_line. The helpers subtract one from the unsigned size and write the converted parameter outside the command line buffer. Convert the IPL parameter in the command line parsing buffer first. A parameter beginning with '=' can then replace the existing command line regardless of its length, while other parameters are appended only when space remains.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:9kernel5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-64k5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-64k-core5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-64k-debug5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-64k-debug-core5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-64k-debug-devel5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-64k-debug-devel-matched5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-64k-debug-modules5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-64k-debug-modules-core5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-64k-debug-modules-extra5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-64k-devel5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-64k-devel-matched5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-64k-modules5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-64k-modules-core5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-64k-modules-extra5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-abi-stablelists5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-core5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-cross-headers5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-debug5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-debug-core5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-debug-devel5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-debug-devel-matched5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-debug-modules5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-debug-modules-core5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-debug-modules-extra5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-debug-uki-virt5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-devel5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-devel-matched5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-doc5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-headers5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-modules5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-modules-core5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-modules-extra5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-rt5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-rt-64k5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-rt-64k-core5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-rt-64k-debug5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-rt-64k-debug-core5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-rt-64k-debug-devel5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-rt-64k-debug-modules5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-rt-64k-debug-modules-core5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-rt-64k-debug-modules-extra5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-rt-64k-devel5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-rt-64k-modules5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-rt-64k-modules-core5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-rt-64k-modules-extra5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-rt-core5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-rt-debug5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-rt-debug-core5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-rt-debug-devel5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-rt-debug-modules5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-rt-debug-modules-core5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-rt-debug-modules-extra5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-rt-devel5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-rt-modules5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-rt-modules-core5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-rt-modules-extra5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-tools5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-tools-libs5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-tools-libs-devel5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-uki-virt5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-uki-virt-addons5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-zfcpdump5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-zfcpdump-core5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-zfcpdump-devel5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-zfcpdump-devel-matched5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-zfcpdump-modules5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-zfcpdump-modules-core5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9kernel-zfcpdump-modules-extra5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9libperf5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9perf5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9python3-perf5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9rtla5.14.0-687.66.1.el9_8ALSA-2026:95370
AlmaLinux:9rv5.14.0-687.66.1.el9_8ALSA-2026:95370
Debian:12linuxno fix listedDEBIAN-CVE-2026-98403
Debian:13linux6.12.113-1DEBIAN-CVE-2026-98403
Debian:14linux7.2.7-1DEBIAN-CVE-2026-98403
Debian:12linux-6.126.12.113-1~deb12u1DEBIAN-CVE-2026-98403
Rocky Linux:9kernel0:5.14.0-687.66.1.el9_8RLSA-2026:95370
Ubuntu:22.04:LTSlinuxno fix listedUBUNTU-CVE-2026-98403
Ubuntu:24.04:LTSlinuxno fix listedUBUNTU-CVE-2026-98403
Ubuntu:26.04:LTSlinux7.0.0-42.42UBUNTU-CVE-2026-98403
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2026-98403
Ubuntu:22.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-98403
Ubuntu:24.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-98403
Ubuntu:26.04:LTSlinux-aws7.0.0-1016.17UBUNTU-CVE-2026-98403
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2026-98403
Ubuntu:24.04:LTSlinux-aws-6.14no fix listedUBUNTU-CVE-2026-98403
Ubuntu:24.04:LTSlinux-aws-6.17no fix listedUBUNTU-CVE-2026-98403
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2026-98403
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2026-98403
Ubuntu:22.04:LTSlinux-aws-6.8no fix listedUBUNTU-CVE-2026-98403
Ubuntu:24.04:LTSlinux-aws-7.0no fix listedUBUNTU-CVE-2026-98403
Ubuntu:22.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-98403
Ubuntu:24.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-98403
Ubuntu:26.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-98403
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2026-98403
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2026-98403
Ubuntu:24.04:LTSlinux-azure-6.14no fix listedUBUNTU-CVE-2026-98403
Ubuntu:24.04:LTSlinux-azure-6.17no fix listedUBUNTU-CVE-2026-98403
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2026-98403
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2026-98403
Ubuntu:22.04:LTSlinux-azure-6.8no fix listedUBUNTU-CVE-2026-98403
Ubuntu:24.04:LTSlinux-azure-7.0no fix listedUBUNTU-CVE-2026-98403
Ubuntu:22.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-98403
Ubuntu:24.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-98403
Ubuntu:26.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-98403
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2026-98403
Ubuntu:24.04:LTSlinux-azure-fde-6.14no fix listedUBUNTU-CVE-2026-98403
Ubuntu:24.04:LTSlinux-azure-fde-6.17no fix listedUBUNTU-CVE-2026-98403
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2026-98403
Ubuntu:22.04:LTSlinux-azure-fde-6.8no fix listedUBUNTU-CVE-2026-98403
Ubuntu:24.04:LTSlinux-azure-fde-7.0no fix listedUBUNTU-CVE-2026-98403
Ubuntu:24.04:LTSlinux-azure-nvidiano fix listedUBUNTU-CVE-2026-98403
Ubuntu:24.04:LTSlinux-azure-nvidia-6.14no fix listedUBUNTU-CVE-2026-98403
Ubuntu:22.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-98403
Ubuntu:24.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-98403
Ubuntu:26.04:LTSlinux-gcp7.0.0-1016.18UBUNTU-CVE-2026-98403
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2026-98403
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2026-98403
Ubuntu:24.04:LTSlinux-gcp-6.14no fix listedUBUNTU-CVE-2026-98403
Ubuntu:24.04:LTSlinux-gcp-6.17no fix listedUBUNTU-CVE-2026-98403
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2026-98403
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2026-98403
Ubuntu:22.04:LTSlinux-gcp-6.8no fix listedUBUNTU-CVE-2026-98403
Ubuntu:24.04:LTSlinux-gcp-7.0no fix listedUBUNTU-CVE-2026-98403
Ubuntu:22.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-98403
Ubuntu:24.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-98403
Ubuntu:26.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-98403
Ubuntu:22.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2026-98403
Ubuntu:24.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2026-98403
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2026-98403
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2026-98403
Ubuntu:24.04:LTSlinux-hwe-6.14no fix listedUBUNTU-CVE-2026-98403
Ubuntu:24.04:LTSlinux-hwe-6.17no fix listedUBUNTU-CVE-2026-98403
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2026-98403
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2026-98403
Ubuntu:22.04:LTSlinux-hwe-6.8no fix listedUBUNTU-CVE-2026-98403
Ubuntu:24.04:LTSlinux-hwe-7.07.0.0-42.42~24.04.1UBUNTU-CVE-2026-98403
Ubuntu:22.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-98403
Ubuntu:24.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-98403
Ubuntu:26.04:LTSlinux-ibm7.0.0-1017.17UBUNTU-CVE-2026-98403
Ubuntu:22.04:LTSlinux-ibm-6.8no fix listedUBUNTU-CVE-2026-98403
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2026-98403
Ubuntu:22.04:LTSlinux-intel-iotgno fix listedUBUNTU-CVE-2026-98403
Ubuntu:22.04:LTSlinux-kvmno fix listedUBUNTU-CVE-2026-98403
Ubuntu:22.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2026-98403
Ubuntu:24.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2026-98403
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2026-98403
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2026-98403
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2026-98403
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2026-98403
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.8no fix listedUBUNTU-CVE-2026-98403
Ubuntu:22.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-98403
Ubuntu:24.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-98403
Ubuntu:26.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-98403
Ubuntu:24.04:LTSlinux-nvidia-6.11no fix listedUBUNTU-CVE-2026-98403
Ubuntu:24.04:LTSlinux-nvidia-6.17no fix listedUBUNTU-CVE-2026-98403
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2026-98403
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2026-98403
Ubuntu:22.04:LTSlinux-nvidia-6.8no fix listedUBUNTU-CVE-2026-98403
Ubuntu:24.04:LTSlinux-nvidia-7.0no fix listedUBUNTU-CVE-2026-98403
Ubuntu:26.04:LTSlinux-nvidia-bosno fix listedUBUNTU-CVE-2026-98403
Ubuntu:24.04:LTSlinux-nvidia-lowlatencyno fix listedUBUNTU-CVE-2026-98403
Ubuntu:22.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2026-98403
Ubuntu:24.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2026-98403
Ubuntu:22.04:LTSlinux-nvidia-tegra-igxno fix listedUBUNTU-CVE-2026-98403
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2026-98403
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2026-98403
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2026-98403
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2026-98403
Ubuntu:24.04:LTSlinux-oem-6.14no fix listedUBUNTU-CVE-2026-98403
Ubuntu:24.04:LTSlinux-oem-6.17no fix listedUBUNTU-CVE-2026-98403
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2026-98403
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2026-98403
Ubuntu:26.04:LTSlinux-oem-7.07.0.0-1017.17UBUNTU-CVE-2026-98403
Ubuntu:22.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-98403
Ubuntu:24.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-98403
Ubuntu:26.04:LTSlinux-oracle7.0.0-1015.16UBUNTU-CVE-2026-98403
Ubuntu:24.04:LTSlinux-oracle-6.14no fix listedUBUNTU-CVE-2026-98403
Ubuntu:24.04:LTSlinux-oracle-6.17no fix listedUBUNTU-CVE-2026-98403
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2026-98403
Ubuntu:22.04:LTSlinux-oracle-6.8no fix listedUBUNTU-CVE-2026-98403
Ubuntu:24.04:LTSlinux-oracle-7.0no fix listedUBUNTU-CVE-2026-98403
Ubuntu:22.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-98403
Ubuntu:24.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-98403
Ubuntu:26.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-98403
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2026-98403
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-98403
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-98403
Ubuntu:26.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-98403
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-98403
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-98403
Ubuntu:26.04:LTSlinux-riscv7.0.0-42.42.1UBUNTU-CVE-2026-98403
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2026-98403
Ubuntu:24.04:LTSlinux-riscv-6.14no fix listedUBUNTU-CVE-2026-98403
Ubuntu:24.04:LTSlinux-riscv-6.17no fix listedUBUNTU-CVE-2026-98403
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2026-98403
Ubuntu:22.04:LTSlinux-riscv-6.8no fix listedUBUNTU-CVE-2026-98403
Ubuntu:24.04:LTSlinux-riscv-7.07.0.0-42.42.1~24.04.1UBUNTU-CVE-2026-98403

Affected products (as reported)

VendorProductVersions
Linux Linux 5ecb2da660ab8eddafe059a6a8a708465db89ca2 – before af9866021a00ab9eeacf0c33ee73f3d134b4ed705ecb2da660ab8eddafe059a6a8a708465db89ca2 – before 73eec5a0d55916d7e1115f5d03a7ffc06d6215cf5ecb2da660ab8eddafe059a6a8a708465db89ca2 – before 8d11bfec8666f8409fac9072e9c25b691d3e30ac5ecb2da660ab8eddafe059a6a8a708465db89ca2 – before d76181dfabdaa720703167393704efacba343442
Linux Linux 5.16

References