| 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-2021-47348: drm/amd/display: Avoid HDCP over-read and corruption |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| drm/amd/display: Avoid HDCP over-read and corruption |
| |
| Instead of reading the desired 5 bytes of the actual target field, |
| the code was reading 8. This could result in a corrupted value if the |
| trailing 3 bytes were non-zero, so instead use an appropriately sized |
| and zero-initialized bounce buffer, and read only 5 bytes before casting |
| to u64. |
| |
| The Linux kernel CVE team has assigned CVE-2021-47348 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 5.10.51 with commit c5b518f4b98dbb2bc31b6a55e6aaa1e0e2948f2e |
| Fixed in 5.12.18 with commit 44c7c901cb368a9f2493748f213b247b5872639f |
| Fixed in 5.13.3 with commit 3b2b93a485fb7a970bc8b5daef16f4cf579d172f |
| Fixed in 5.14 with commit 06888d571b513cbfc0b41949948def6cb81021b2 |
| |
| 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-2021-47348 |
| 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/gpu/drm/amd/display/modules/hdcp/hdcp1_execution.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/c5b518f4b98dbb2bc31b6a55e6aaa1e0e2948f2e |
| https://git.kernel.org/stable/c/44c7c901cb368a9f2493748f213b247b5872639f |
| https://git.kernel.org/stable/c/3b2b93a485fb7a970bc8b5daef16f4cf579d172f |
| https://git.kernel.org/stable/c/06888d571b513cbfc0b41949948def6cb81021b2 |
