CVE-2026-64070

kernel: powerpc/hv-gpci: fix preempt count leak in sysfs show paths

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Severity

Low

Red Hat Product Security

5.5

CVSS 3.1

Review impact separately from score.

Published · July 19, 2026

Updated · October 29, 2026

Description

A flaw was found in the Linux kernel's powerpc/hv-gpci component. This vulnerability allows a local attacker to cause a denial of service (DoS) by repeatedly reading from specific sysfs files. The flaw is due to a preemption count leak, where successful reads from sysfs show functions fail to re-enable preemption. This can lead to a 'scheduling while atomic' bug, causing a system crash and coredump.

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-772 · Missing Release of Resource after Effective Lifetime