CVE-2024-27009 Information

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.

Reference

https://git.kernel.org/stable/c/3076b3c38a704e10df5e143c213653309d532538 https://git.kernel.org/stable/c/559f3a6333397ab6cd4a696edd65a70b6be62c6e https://git.kernel.org/stable/c/2df56f4ea769ff81e51bbb05699989603bde9c49 https://git.kernel.org/stable/c/a4234decd0fe429832ca81c4637be7248b88b49e https://git.kernel.org/stable/c/2d8527f2f911fab84aec04df4788c0c23af3df48 https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4EZ6PJW7VOZ224TD7N4JZNU6KV32ZJ53/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GCBZZEC7L7KTWWAS2NLJK6SO3IZIL4WW/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DAMSOZXJEPUOXW33WZYWCVAY7Z5S7OOY/