| 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-2024-38629: dmaengine: idxd: Avoid unnecessary destruction of file_ida |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| dmaengine: idxd: Avoid unnecessary destruction of file_ida |
| |
| file_ida is allocated during cdev open and is freed accordingly |
| during cdev release. This sequence is guaranteed by driver file |
| operations. Therefore, there is no need to destroy an already empty |
| file_ida when the WQ cdev is removed. |
| |
| Worse, ida_free() in cdev release may happen after destruction of |
| file_ida per WQ cdev. This can lead to accessing an id in file_ida |
| after it has been destroyed, resulting in a kernel panic. |
| |
| Remove ida_destroy(&file_ida) to address these issues. |
| |
| The Linux kernel CVE team has assigned CVE-2024-38629 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.4 with commit e6fd6d7e5f0fe4a17a08e892afb5db800e7794ec and fixed in 6.6.33 with commit 9eb15f24a0b9b017b39cde8b8c07243676b63687 |
| Issue introduced in 6.4 with commit e6fd6d7e5f0fe4a17a08e892afb5db800e7794ec and fixed in 6.9.4 with commit 15edb906211bf53e7b5574f7326ab734d6bff4f9 |
| Issue introduced in 6.4 with commit e6fd6d7e5f0fe4a17a08e892afb5db800e7794ec and fixed in 6.10 with commit 76e43fa6a456787bad31b8d0daeabda27351a480 |
| |
| 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-2024-38629 |
| 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/dma/idxd/cdev.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/9eb15f24a0b9b017b39cde8b8c07243676b63687 |
| https://git.kernel.org/stable/c/15edb906211bf53e7b5574f7326ab734d6bff4f9 |
| https://git.kernel.org/stable/c/76e43fa6a456787bad31b8d0daeabda27351a480 |
