What’s Vulnerable › Vulnerabilities

CVE-2023-54092: KVM: s390: pv: fix index value of replaced ASCE

• Severity: high (CVSS 8.8 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: 2025-12-24 · updated 2026-10-15

Description

In the Linux kernel, the following vulnerability has been resolved: KVM: s390: pv: fix index value of replaced ASCE The index field of the struct page corresponding to a guest ASCE should be 0. When replacing the ASCE in s390_replace_asce(), the index of the new ASCE should also be set to 0. Having the wrong index might lead to the wrong addresses being passed around when notifying pte invalidations, and eventually to validity intercepts (VM crash) if the prefix gets unmapped and the notifier gets called with the wrong address.

Affected products

• Linux kernel: from 5.10.137 before 5.10.190; from 5.15.61 before 5.15.124; from 5.18.18 before 5.19; from 5.19.2 before 5.20; 6.0 — fixed in 5.10.190, 5.15.124, 5.19, 5.20, 6.5

How to fix

Upgrade to a fixed version: Linux kernel 5.10.190, 5.15.124, 5.19, 5.20. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/017f686bcb536ff23d49c143fdf9d1fd89a9a924
• https://git.kernel.org/stable/c/49a2686adddebe1ae76b4d368383208656ef6606
• https://git.kernel.org/stable/c/8e635da0e0d3cb45e32fa79b36218fb98281bc10
• https://git.kernel.org/stable/c/c2fceb59bbda16468bda82b002383bff59de89ab
• https://git.kernel.org/stable/c/f1c7a776338f2ac5e34da40e58fe9f33ea390a5e

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