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CVE-2024-27009

Disclosure Date: May 01, 2024 •
CVE-2024-27009
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Description

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.

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CVSS V3 Severity and Metrics
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General Information

Offensive Application
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Utility Class
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Ports
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OS
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Vulnerable Versions
Linux 3076b3c38a70
Linux not down converted
Prerequisites
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Discovered By
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Metasploit Module
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Vendors

  • Linux

Products

  • Linux
Technical Analysis