| 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-2021-46920: dmaengine: idxd: Fix clobbering of SWERR overflow bit on writeback |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| dmaengine: idxd: Fix clobbering of SWERR overflow bit on writeback |
| |
| Current code blindly writes over the SWERR and the OVERFLOW bits. Write |
| back the bits actually read instead so the driver avoids clobbering the |
| OVERFLOW bit that comes after the register is read. |
| |
| The Linux kernel CVE team has assigned CVE-2021-46920 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.6 with commit bfe1d56091c1a404b3d4ce7e9809d745fc4453bb and fixed in 5.10.32 with commit a5ad12d5d69c63af289a37f05187a0c6fe93553d |
| Issue introduced in 5.6 with commit bfe1d56091c1a404b3d4ce7e9809d745fc4453bb and fixed in 5.11.16 with commit 02981a44a0e402089775416371bd2e0c935685f8 |
| Issue introduced in 5.6 with commit bfe1d56091c1a404b3d4ce7e9809d745fc4453bb and fixed in 5.12 with commit ea941ac294d75d0ace50797aebf0056f6f8f7a7f |
| |
| 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-2021-46920 |
| 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/irq.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/a5ad12d5d69c63af289a37f05187a0c6fe93553d |
| https://git.kernel.org/stable/c/02981a44a0e402089775416371bd2e0c935685f8 |
| https://git.kernel.org/stable/c/ea941ac294d75d0ace50797aebf0056f6f8f7a7f |
