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CVE-2023-52639

Disclosure Date: April 03, 2024
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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.

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CVSS V3 Severity and Metrics
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General Information

Vendors

  • Linux

Products

  • Linux
Technical Analysis