CVE-2023-52639

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.

CVSS Metrics

• v3.1•MEDIUM•Score: 4.7CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Trends

Current EPSS score: 0.01%• Percentile: 1%

Techniques & Countermeasures

• CWE-362•Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

  The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.

Affected Systems

• linux•linux

  ≥ a3508fbe9dc6dd3bece0c7bf889cc085a011738c, < 5df3b81a567eb565029563f26f374ae3803a1dfc | ≥ a3508fbe9dc6dd3bece0c7bf889cc085a011738c, < f5572c0323cf8b4f1f0618178648a25b8fb8a380 | ≥ a3508fbe9dc6dd3bece0c7bf889cc085a011738c, < 28bb27824f25f36e5f80229a358d66ee09244082 | ≥ a3508fbe9dc6dd3bece0c7bf889cc085a011738c, < fe752331d4b361d43cfd0b89534b4b2176057c32 | 4.8

• linux•linux_kernel

  ≥ 4.8, < 6.1.82 | ≥ 6.2, < 6.6.22 | ≥ 6.7, < 6.7.6 | 6.8:rc1 | 6.8:rc2 | 6.8:rc3

References (4)

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