| 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-2021-46919: dmaengine: idxd: fix wq size store permission state |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| dmaengine: idxd: fix wq size store permission state |
| |
| WQ size can only be changed when the device is disabled. Current code |
| allows change when device is enabled but wq is disabled. Change the check |
| to detect device state. |
| |
| The Linux kernel CVE team has assigned CVE-2021-46919 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.6 with commit c52ca478233c172b2d322b5241d6279a8661cbba and fixed in 5.10.32 with commit 4ecf25595273203010bc8318c4aee60ad64037ae |
| Issue introduced in 5.6 with commit c52ca478233c172b2d322b5241d6279a8661cbba and fixed in 5.11.16 with commit 05b7791c4c4aa8304368fdc55ae911f6b34e7281 |
| Issue introduced in 5.6 with commit c52ca478233c172b2d322b5241d6279a8661cbba and fixed in 5.12 with commit 0fff71c5a311e1264988179f7dcc217fda15fadd |
| |
| 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-2021-46919 |
| 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/sysfs.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/4ecf25595273203010bc8318c4aee60ad64037ae |
| https://git.kernel.org/stable/c/05b7791c4c4aa8304368fdc55ae911f6b34e7281 |
| https://git.kernel.org/stable/c/0fff71c5a311e1264988179f7dcc217fda15fadd |
