| From bippy-5f407fcff5a0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2024-27009: s390/cio: fix race condition during online processing |
| |
| 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. |
| |
| The Linux kernel CVE team has assigned CVE-2024-27009 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.15 with commit 2297791c92d04a154ad29ba5a073f9f627982110 and fixed in 5.15.157 with commit 3076b3c38a704e10df5e143c213653309d532538 |
| Issue introduced in 5.15 with commit 2297791c92d04a154ad29ba5a073f9f627982110 and fixed in 6.1.88 with commit 559f3a6333397ab6cd4a696edd65a70b6be62c6e |
| Issue introduced in 5.15 with commit 2297791c92d04a154ad29ba5a073f9f627982110 and fixed in 6.6.29 with commit 2df56f4ea769ff81e51bbb05699989603bde9c49 |
| Issue introduced in 5.15 with commit 2297791c92d04a154ad29ba5a073f9f627982110 and fixed in 6.8.8 with commit a4234decd0fe429832ca81c4637be7248b88b49e |
| Issue introduced in 5.15 with commit 2297791c92d04a154ad29ba5a073f9f627982110 and fixed in 6.9 with commit 2d8527f2f911fab84aec04df4788c0c23af3df48 |
| |
| Please see https://www.kernel.org for a full list of currently supported |
| kernel versions by the kernel community. |
| |
| Unaffected versions might change over time as fixes are backported to |
| older supported kernel versions. The official CVE entry at |
| https://cve.org/CVERecord/?id=CVE-2024-27009 |
| will be updated if fixes are backported, please check that for the most |
| up to date information about this issue. |
| |
| |
| Affected files |
| ============== |
| |
| The file(s) affected by this issue are: |
| drivers/s390/cio/device.c |
| |
| |
| Mitigation |
| ========== |
| |
| The Linux kernel CVE team recommends that you update to the latest |
| stable kernel version for this, and many other bugfixes. Individual |
| changes are never tested alone, but rather are part of a larger kernel |
| release. Cherry-picking individual commits is not recommended or |
| supported by the Linux kernel community at all. If however, updating to |
| the latest release is impossible, the individual changes to resolve this |
| issue can be found at these commits: |
| 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 |
