CVE-2023-52639: Linux Kernel

Medium severity, CVSS 4.7. EPSS: 0.2% chance of exploitation in the next 30 days.

In the Linux kernel, the following vulnerability has been resolved: KVM: s390: vsie: fix race during shadow creation Right now it is possible to see gmap->private being zero in kvm_s390_vsie_gmap_notifier resulting in a crash. This is due to the fact that we add gmap->private == kvm after creation: static int acquire_gmap_shadow(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) { [...] gmap = gmap_shadow(vcpu->arch.gmap, asce, edat); if (IS_ERR(gmap)) return PTR_ERR(gmap); gmap->private = vcpu->kvm; Let children inherit the private field of the parent.

Affected products

• Linux Linux Kernel: from 4.8, before 6.1.82 (fixed in 6.1.82); from 6.2, before 6.6.22 (fixed in 6.6.22); from 6.7, before 6.7.6 (fixed in 6.7.6); version 6.8 only

Published 2024-04-03. Last modified 2026-06-17.