What’s Vulnerable › Vulnerabilities

CVE-2023-52639: KVM: s390: vsie: fix race during shadow creation

• Severity: medium (CVSS 4.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-04-03 · updated 2026-06-17
• Weakness: CWE-362

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.

Affected products

• Linux kernel: from 4.8 before 6.1.82; from 6.2 before 6.6.22; from 6.7 before 6.7.6; 6.8-rc1, 6.8-rc2, 6.8-rc3 — fixed in 6.1.82, 6.6.22, 6.7.6

How to fix

Upgrade to a fixed version: Linux kernel 6.1.82, 6.6.22, 6.7.6. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/28bb27824f25f36e5f80229a358d66ee09244082
• https://git.kernel.org/stable/c/5df3b81a567eb565029563f26f374ae3803a1dfc
• https://git.kernel.org/stable/c/f5572c0323cf8b4f1f0618178648a25b8fb8a380
• https://git.kernel.org/stable/c/fe752331d4b361d43cfd0b89534b4b2176057c32
• https://git.kernel.org/stable/c/28bb27824f25f36e5f80229a358d66ee09244082
• https://git.kernel.org/stable/c/5df3b81a567eb565029563f26f374ae3803a1dfc
• https://git.kernel.org/stable/c/f5572c0323cf8b4f1f0618178648a25b8fb8a380
• https://git.kernel.org/stable/c/fe752331d4b361d43cfd0b89534b4b2176057c32

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