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CVE-2023-52639 is a race condition in the Linux kernel KVM implementation for s390, specifically the Virtualization Exception Interpretation (VSIE) shadow-gmap creation path. A newly created shadow gmap can be observed by the gmap notifier before its private field is initialized with the owning KVM instance. The notifier may consequently encounter a null private field and crash. The upstream fix causes child shadow gmaps to inherit the private field from their parent during creation, eliminating the uninitialized observation window.
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Race condition in Linux KVM s390 VSIE shadow creation.
Linux kernel KVM s390 VSIE race condition during shadow creation.
A race condition in the Linux kernel KVM s390 virtual-SIE shadow creation logic.
A race-condition vulnerability in the Linux kernel's KVM virtualization support for IBM s390 architecture, specifically the VSIE shadow-creation path.
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Cross-references every affected SKU, including bundled OEM variants.
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