CVE-2025-71155: KVM: s390: Fix gmap_helper_zap_one_page() again

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-01-23 · updated 2026-07-30
Weakness: CWE-787

Description

In the Linux kernel, the following vulnerability has been resolved: KVM: s390: Fix gmap_helper_zap_one_page() again A few checks were missing in gmap_helper_zap_one_page(), which can lead to memory corruption in the guest under specific circumstances. Add the missing checks.

Affected products

Linux kernel: from 6.17.4 before 6.18; from 6.18 before 6.18.4 — fixed in 6.18, 6.18.4

How to fix

Upgrade to a fixed version: Linux kernel 6.18, 6.18.4. Check the vendor advisory for mitigations.

References

https://git.kernel.org/stable/c/2af2abbcbf8573100288e8f8aea2dab8a2a0ceb7
https://git.kernel.org/stable/c/2f393c228cc519ddf19b8c6c05bf15723241aa96

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