CVE-2024-27009: Linux Kernel

Medium severity, CVSS 4.7. EPSS: 0.2% chance of exploitation in the next 30 days.

In the Linux kernel, the following vulnerability has been resolved: s390/cio: fix race condition during online processing A race condition exists in ccw_device_set_online() that can cause the online process to fail, leaving the affected device in an inconsistent state. As a result, subsequent attempts to set that device online fail with return code ENODEV. The problem occurs when a path verification request arrives after a wait for final device state completed, but before the result state is evaluated. Fix this by ensuring that the CCW-device lock is held between determining final state and checking result state. Note that since: commit 2297791c92d0 ("s390/cio: dont unregister subchannel from child-drivers") path verification requests are much more likely to occur during boot, resulting in an increased chance of this race condition occurring.

Affected products

• Linux Linux Kernel: from 5.15, before 5.15.157 (fixed in 5.15.157); from 5.16, before 6.1.88 (fixed in 6.1.88); from 6.2, before 6.6.29 (fixed in 6.6.29); from 6.7, before 6.8.8 (fixed in 6.8.8); version 6.9 only

Published 2024-05-01. Last modified 2026-06-17.