CVE-2018-1000204: Linux Kernel version 3.18 to 4.16 incorrectly handles an SG_IO ioctl on /dev/sg0 with dxfer_direction=SG_DX...

Security readout for executives and security teams

This is a local Linux kernel information-disclosure issue in SCSI generic device handling. In affected kernels, a properly positioned local user or process could cause kernel heap memory to be copied to userspace. Business impact is mainly confidentiality risk on older systems, but exposure is limited because normal users usually cannot access these devices. Exposure is most plausible on older Linux systems running affected kernels where untrusted local users, services, or containers can access SCSI generic devices or hold relevant raw/admin capabilities. Default permissions often reduce exposure, but historic guidance to loosen device permissions increases risk. Treat this as a targeted remediation item for legacy Linux assets, not an internet-wide emergency. Prioritize systems with shared local access, unusual device permissions, privileged containers, or sensitive workloads. Routine kernel patching should resolve most supported-platform exposure. Mitigation focus: Apply vendor kernel updates from Ubuntu, Debian, Red Hat, SUSE, or the relevant distribution.; Ensure the upstream fix is present in custom or backported kernels.; Restrict untrusted access to SCSI generic device nodes..

Prepared

Jun 7, 2026, 06:24 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.