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Red Hat: CVE-2023-52639: kernel: KVM: s390: vsie: fix race during shadow creation (Multiple Advisories)

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Red Hat: CVE-2023-52639: kernel: KVM: s390: vsie: fix race during shadow creation (Multiple Advisories)

Severity
4
CVSS
(AV:L/AC:H/Au:S/C:N/I:N/A:C)
Published
04/03/2024
Created
06/14/2024
Added
06/13/2024
Modified
07/24/2024

Description

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.

Solution(s)

  • redhat-upgrade-kernel

References

  • CVE-2023-52639
  • RHSA-2024:3855
  • RHSA-2024:4740

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