CVE-2026-97526

kernel: s390/pai: Support CPU hotplug for PMU PAI

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Severity

Moderate

Red Hat Product Security

5.5

CVSS 3.1

Review impact separately from score.

Published · September 25, 2026

Updated · September 29, 2026

Description

A flaw was found in the Linux kernel's s390 Processor Activity Instrumentation (PAI) performance monitoring unit. This vulnerability allows a local user to cause a Denial of Service (DoS) by crashing the operating system. When a CPU is dynamically added (hotplugged) during an active performance monitoring session, the kernel fails to allocate necessary per-processor data structures. This issue leads to a null pointer dereference and an immediate kernel panic.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 5.5
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CWE-476 · NULL Pointer Dereference