| 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-2021-46918: dmaengine: idxd: clear MSIX permission entry on shutdown |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| dmaengine: idxd: clear MSIX permission entry on shutdown |
| |
| Add disabling/clearing of MSIX permission entries on device shutdown to |
| mirror the enabling of the MSIX entries on probe. Current code left the |
| MSIX enabled and the pasid entries still programmed at device shutdown. |
| |
| The Linux kernel CVE team has assigned CVE-2021-46918 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.11 with commit 8e50d392652f20616a136165dff516b86baf5e49 and fixed in 5.11.16 with commit c84b8982d7aa9b4717dc36a1c6cbc93ee153b500 |
| Issue introduced in 5.11 with commit 8e50d392652f20616a136165dff516b86baf5e49 and fixed in 5.12 with commit 6df0e6c57dfc064af330071f372f11aa8c584997 |
| |
| 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-2021-46918 |
| 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/device.c |
| drivers/dma/idxd/idxd.h |
| drivers/dma/idxd/init.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/c84b8982d7aa9b4717dc36a1c6cbc93ee153b500 |
| https://git.kernel.org/stable/c/6df0e6c57dfc064af330071f372f11aa8c584997 |
