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Vulnerability · Published Oct 28, 2026 · Assigned by Linux

CVE-2026-99126s390/ctcm: Prevent XID null dereference

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 7% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS )–Not rated
Exploit odds (30 days)0.2%top 92.7% 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/ctcm: Prevent XID null dereference The mpc_validate_xid() function sets grp->saved_xid2->xid2_flag2 to 0x40 to signal XID validation error. If peer XID is NULL or r/w channel pairing mismatch happens, grp->saved_xid2 is never initialized. An attempt to set the flag in such case leads to NULL dereference. Fix this by using the always available priv->xid->xid2_flag2 instead of grp->saved_xid2->xid2_flag2 for validation errors.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linuxno fix listedDEBIAN-CVE-2026-99126
Debian:13linux6.12.115-2DEBIAN-CVE-2026-99126
Debian:14linux7.2.13-1DEBIAN-CVE-2026-99126
Ubuntu:22.04:LTSlinuxno fix listedUBUNTU-CVE-2026-99126
Ubuntu:24.04:LTSlinuxno fix listedUBUNTU-CVE-2026-99126
Ubuntu:26.04:LTSlinuxno fix listedUBUNTU-CVE-2026-99126
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2026-99126
Ubuntu:22.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-99126
Ubuntu:24.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-99126
Ubuntu:26.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-99126
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2026-99126
Ubuntu:24.04:LTSlinux-aws-6.14no fix listedUBUNTU-CVE-2026-99126
Ubuntu:24.04:LTSlinux-aws-6.17no fix listedUBUNTU-CVE-2026-99126
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2026-99126
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2026-99126
Ubuntu:22.04:LTSlinux-aws-6.8no fix listedUBUNTU-CVE-2026-99126
Ubuntu:24.04:LTSlinux-aws-7.0no fix listedUBUNTU-CVE-2026-99126
Ubuntu:22.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-99126
Ubuntu:24.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-99126
Ubuntu:26.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-99126
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2026-99126
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2026-99126
Ubuntu:24.04:LTSlinux-azure-6.14no fix listedUBUNTU-CVE-2026-99126
Ubuntu:24.04:LTSlinux-azure-6.17no fix listedUBUNTU-CVE-2026-99126
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2026-99126
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2026-99126
Ubuntu:22.04:LTSlinux-azure-6.8no fix listedUBUNTU-CVE-2026-99126
Ubuntu:24.04:LTSlinux-azure-7.0no fix listedUBUNTU-CVE-2026-99126
Ubuntu:22.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-99126
Ubuntu:24.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-99126
Ubuntu:26.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-99126
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2026-99126
Ubuntu:24.04:LTSlinux-azure-fde-6.14no fix listedUBUNTU-CVE-2026-99126
Ubuntu:24.04:LTSlinux-azure-fde-6.17no fix listedUBUNTU-CVE-2026-99126
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2026-99126
Ubuntu:22.04:LTSlinux-azure-fde-6.8no fix listedUBUNTU-CVE-2026-99126
Ubuntu:24.04:LTSlinux-azure-fde-7.0no fix listedUBUNTU-CVE-2026-99126
Ubuntu:24.04:LTSlinux-azure-nvidiano fix listedUBUNTU-CVE-2026-99126
Ubuntu:24.04:LTSlinux-azure-nvidia-6.14no fix listedUBUNTU-CVE-2026-99126
Ubuntu:22.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-99126
Ubuntu:24.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-99126
Ubuntu:26.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-99126
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2026-99126
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2026-99126
Ubuntu:24.04:LTSlinux-gcp-6.14no fix listedUBUNTU-CVE-2026-99126
Ubuntu:24.04:LTSlinux-gcp-6.17no fix listedUBUNTU-CVE-2026-99126
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2026-99126
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2026-99126
Ubuntu:22.04:LTSlinux-gcp-6.8no fix listedUBUNTU-CVE-2026-99126
Ubuntu:24.04:LTSlinux-gcp-7.0no fix listedUBUNTU-CVE-2026-99126
Ubuntu:22.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-99126
Ubuntu:24.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-99126
Ubuntu:26.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-99126
Ubuntu:22.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2026-99126
Ubuntu:24.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2026-99126
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2026-99126
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2026-99126
Ubuntu:24.04:LTSlinux-hwe-6.14no fix listedUBUNTU-CVE-2026-99126
Ubuntu:24.04:LTSlinux-hwe-6.17no fix listedUBUNTU-CVE-2026-99126
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2026-99126
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2026-99126
Ubuntu:22.04:LTSlinux-hwe-6.8no fix listedUBUNTU-CVE-2026-99126
Ubuntu:24.04:LTSlinux-hwe-7.0no fix listedUBUNTU-CVE-2026-99126
Ubuntu:22.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-99126
Ubuntu:24.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-99126
Ubuntu:26.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-99126
Ubuntu:22.04:LTSlinux-ibm-6.8no fix listedUBUNTU-CVE-2026-99126
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2026-99126
Ubuntu:22.04:LTSlinux-intel-iotgno fix listedUBUNTU-CVE-2026-99126
Ubuntu:22.04:LTSlinux-kvmno fix listedUBUNTU-CVE-2026-99126
Ubuntu:22.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2026-99126
Ubuntu:24.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2026-99126
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2026-99126
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2026-99126
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2026-99126
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2026-99126
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.8no fix listedUBUNTU-CVE-2026-99126
Ubuntu:22.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-99126
Ubuntu:24.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-99126
Ubuntu:26.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-99126
Ubuntu:24.04:LTSlinux-nvidia-6.11no fix listedUBUNTU-CVE-2026-99126
Ubuntu:24.04:LTSlinux-nvidia-6.17no fix listedUBUNTU-CVE-2026-99126
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2026-99126
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2026-99126
Ubuntu:22.04:LTSlinux-nvidia-6.8no fix listedUBUNTU-CVE-2026-99126
Ubuntu:24.04:LTSlinux-nvidia-7.0no fix listedUBUNTU-CVE-2026-99126
Ubuntu:26.04:LTSlinux-nvidia-bosno fix listedUBUNTU-CVE-2026-99126
Ubuntu:24.04:LTSlinux-nvidia-lowlatencyno fix listedUBUNTU-CVE-2026-99126
Ubuntu:22.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2026-99126
Ubuntu:24.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2026-99126
Ubuntu:22.04:LTSlinux-nvidia-tegra-igxno fix listedUBUNTU-CVE-2026-99126
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2026-99126
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2026-99126
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2026-99126
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2026-99126
Ubuntu:24.04:LTSlinux-oem-6.14no fix listedUBUNTU-CVE-2026-99126
Ubuntu:24.04:LTSlinux-oem-6.17no fix listedUBUNTU-CVE-2026-99126
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2026-99126
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2026-99126
Ubuntu:26.04:LTSlinux-oem-7.0no fix listedUBUNTU-CVE-2026-99126
Ubuntu:22.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-99126
Ubuntu:24.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-99126
Ubuntu:26.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-99126
Ubuntu:24.04:LTSlinux-oracle-6.14no fix listedUBUNTU-CVE-2026-99126
Ubuntu:24.04:LTSlinux-oracle-6.17no fix listedUBUNTU-CVE-2026-99126
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2026-99126
Ubuntu:22.04:LTSlinux-oracle-6.8no fix listedUBUNTU-CVE-2026-99126
Ubuntu:24.04:LTSlinux-oracle-7.0no fix listedUBUNTU-CVE-2026-99126
Ubuntu:22.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-99126
Ubuntu:24.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-99126
Ubuntu:26.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-99126
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2026-99126
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-99126
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-99126
Ubuntu:26.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-99126
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-99126
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-99126
Ubuntu:26.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-99126
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2026-99126
Ubuntu:24.04:LTSlinux-riscv-6.14no fix listedUBUNTU-CVE-2026-99126
Ubuntu:24.04:LTSlinux-riscv-6.17no fix listedUBUNTU-CVE-2026-99126
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2026-99126
Ubuntu:22.04:LTSlinux-riscv-6.8no fix listedUBUNTU-CVE-2026-99126
Ubuntu:24.04:LTSlinux-riscv-7.0no fix listedUBUNTU-CVE-2026-99126
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2026-99126
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2026-99126
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2026-99126
Ubuntu:24.04:LTSlinux-vmwareno fix listedUBUNTU-CVE-2026-99126
Ubuntu:24.04:LTSlinux-xilinxno fix listedUBUNTU-CVE-2026-99126
Ubuntu:22.04:LTSlinux-xilinx-zynqmpno fix listedUBUNTU-CVE-2026-99126

Affected products (as reported)

VendorProductVersions
Linux Linux 293d984f0e3604c04dcdbf00117ddc1e5d4b1909 – before f9d9e2dadc9fbdfe01aeb6581978c3b59092919e293d984f0e3604c04dcdbf00117ddc1e5d4b1909 – before a7c3e1795e4fe5e6680cab7cd7eee0503b00a248293d984f0e3604c04dcdbf00117ddc1e5d4b1909 – before c11e435d334e4c311eaaf721e179a5ca6852c221293d984f0e3604c04dcdbf00117ddc1e5d4b1909 – before 977dac6cc5531a8e058df05b6af94406b940cb9e293d984f0e3604c04dcdbf00117ddc1e5d4b1909 – before 1525fb6e2f9f9a2c8c8723ee0959b1130a6b8213293d984f0e3604c04dcdbf00117ddc1e5d4b1909 – before 34fa3607b7604b3052b19cec8b0ad644818cdd2a293d984f0e3604c04dcdbf00117ddc1e5d4b1909 – before 8a2f7a4ad1d81612fa65bfa4d392ba1bb2f5eeab293d984f0e3604c04dcdbf00117ddc1e5d4b1909 – before b264d8422779d69febce914efc47a92a85cc382c
Linux Linux 2.6.26

References