CVE-2023-52639: linux kernel — Fix

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 v3.1 Score

4.7

MEDIUM

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness Type (CWE)

CWE-362 CWE-362

Affected Products

Vendor	Product	Versions
linux	linux_kernel	4.8 — 6.1.82
linux	linux_kernel	6.2 — 6.6.22
linux	linux_kernel	6.7 — 6.7.6
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All

References

Advisories & Patches

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

Frequently Asked Questions

What is CVE-2023-52639? +

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. It has a CVSS v3.1 base score of 4.7 (MEDIUM).

How severe is CVE-2023-52639? +

CVE-2023-52639 has a CVSS v3.1 score of 4.7 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2023-52639? +

CVE-2023-52639 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2023-52639? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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