# CVE-2024-27009: linux: In the Linux kernel, the following vulnerability has been resolved:  s390/cio: fix race condition during online proce...

CVE-2024-27009 is fixed in linux on 1 platform, first by DEBIAN-CVE-2024-27009, released May 1, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2024-27009
- Priority: Routine
- CVSS: 4.7 (medium)
- EPSS: 0.0018
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 1, 2024

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.90-1 | [DEBIAN-CVE-2024-27009](https://patchblox.com/security/data/fix/linux/debian-cve-2024-27009.md) | May 1, 2024 |
| Linux | linux Debian 13.5 (trixie) | 6.8.9-1 | [DEBIAN-CVE-2024-27009](https://patchblox.com/security/data/fix/linux/debian-cve-2024-27009.md) | May 1, 2024 |
| Linux | linux Debian 14 | 6.8.9-1 | [DEBIAN-CVE-2024-27009](https://patchblox.com/security/data/fix/linux/debian-cve-2024-27009.md) | May 1, 2024 |

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