CVE-2023-52639

low-risk
Published 2024-04-03

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.

Do I need to act?

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0.01% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
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Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
4
CVSS 4.7/10 Medium
LOCAL / HIGH complexity

Affected Products (4)

Affected Vendors

Linux

References (8)

Patch https://git.kernel.org/stable/c/28bb27824f25f36e5f80229a358d66ee09244082
Patch https://git.kernel.org/stable/c/5df3b81a567eb565029563f26f374ae3803a1dfc
Patch https://git.kernel.org/stable/c/f5572c0323cf8b4f1f0618178648a25b8fb8a380
Patch https://git.kernel.org/stable/c/fe752331d4b361d43cfd0b89534b4b2176057c32
Patch https://git.kernel.org/stable/c/28bb27824f25f36e5f80229a358d66ee09244082
Patch https://git.kernel.org/stable/c/5df3b81a567eb565029563f26f374ae3803a1dfc
Patch https://git.kernel.org/stable/c/f5572c0323cf8b4f1f0618178648a25b8fb8a380
Patch https://git.kernel.org/stable/c/fe752331d4b361d43cfd0b89534b4b2176057c32
22
/ 100
low-risk
Severity 12/34 · Low
Exploitability 0/34 · Minimal
Exposure 10/34 · Low