CVE-2026-89460
kernel: s390/cpum_cf: Handle CPU hotplug via prepare/dead callbacks
Severity
LowRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · September 11, 2026
Updated · October 29, 2026
Description
A flaw was found in the Linux kernel. A local user can trigger a kernel panic by running the perf stat command while CPUs are being hotplugged. This occurs because the system fails to properly allocate CPU event structures for newly online CPUs, leading to a null pointer dereference. Successful exploitation results in a Denial of Service (DoS) due to a system crash.
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 · 4.4CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
CWE-476 · NULL Pointer Dereference