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CVE-2026-89922: KVM: s390: Take srcu when importing watchpoint data

• Severity: high (CVSS 7.8 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: 2026-09-16 · updated 2026-10-19

Description

In the Linux kernel, the following vulnerability has been resolved: KVM: s390: Take srcu when importing watchpoint data __import_wp_info() backs up the original guest memory contents of a watchpoint with read_guest_abs(), which is kvm_read_guest() and therefore resolves the memslot via __kvm_memslots(). That requires kvm->srcu (or kvm->slots_lock) to be held, otherwise a concurrent memslot update can free the memslots array under us once its SRCU grace period has elapsed. As this is not fast path, following lock ordering (mutex first, then srcu) take the big hammer and hold the srcu for the full import.

Affected products

• Linux kernel: 3.16 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/4c05bf21d1806853e662cc19e744736a3408f155
• https://git.kernel.org/stable/c/6830fbc3724bf49c142aae69a4694f115fa9cedd
• https://git.kernel.org/stable/c/76f5b4ea9ed0aa5a34bda9d8a878f2c73026ec03
• https://git.kernel.org/stable/c/a4e482def8533ebace517d9f67f1465841b1f982
• https://git.kernel.org/stable/c/cc710ee45395efb4937e042960f791d33924e5f6
• https://git.kernel.org/stable/c/f8e3a9997d5ecd56ebe4b262ff424516c068fecb

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