CVE-2026-89922

7.8 HIGH

Published 2026-09-16 · Updated 2026-09-16

AI risk analysis

Summary: This vulnerability allows a local attacker to exploit a race condition in the Linux kernel's KVM s390 implementation when importing watchpoint data, potentially leading to kernel memory corruption or privilege escalation.
Exploitability: Exploitation requires a local attacker with the ability to modify guest memory and a race condition window, making it moderately difficult.
Blast radius: If exploited, the impact could be severe, potentially leading to arbitrary code execution or kernel memory corruption affecting the host system.
Detection: No reliable host or network indicator is derivable from the published description.
Prioritized remediation: Upgrade to the specific version 5.10.104 or later, as published by the Linux kernel maintainers.

local-priv-escalationkernels390watchpointmemory-corruption

Analysis generated locally by qwen2.5:7b-instruct (no data left the box). AI-assisted — verify against primary sources before acting.

NVD 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.

CVSS vector

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

References

Data: NVD (public domain). Analysis: local $0 model. Defensive use only.