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CVE-2023-52597 is an improper input-validation flaw in Linux kernel KVM support for IBM s390 systems. The KVM vCPU FPU-state ioctl temporarily loaded a guest-supplied floating-point control (FPC) value into the host CPU FPC register to validate it. If an interrupt occurred during that interval and interrupt-context code used floating-point or vector registers, the kernel could save the temporary guest FPC state as though it belonged to the host userspace process. Although the validation routine restored the original FPC value, that restoration could be discarded on return to userspace, causing the host process to continue with the guest-provided FPC value. The fix removes the unsafe temporary validation; invalid FPC values are handled before entry into the SIE execution context.
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4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A specific vulnerability tracked as CVE-2023-52597 referenced in a Unity Linux local security check advisory.
A Linux kernel vulnerability addressed by this Red Hat kernel-rt update; no technical description is provided in the advisory content.
A vulnerability addressed through the updated container images; no technical details are provided.
A low-severity Linux kernel KVM s390 flaw involving validation of a guest CPU floating-point control register. Under an interrupt timing condition, a guest-provided fpc value could corrupt the host process's active fpc register, affecting integrity and availability.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.