| 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-2024-56775: drm/amd/display: Fix handling of plane refcount |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| drm/amd/display: Fix handling of plane refcount |
| |
| [Why] |
| The mechanism to backup and restore plane states doesn't maintain |
| refcount, which can cause issues if the refcount of the plane changes |
| in between backup and restore operations, such as memory leaks if the |
| refcount was supposed to go down, or double frees / invalid memory |
| accesses if the refcount was supposed to go up. |
| |
| [How] |
| Cache and re-apply current refcount when restoring plane states. |
| |
| The Linux kernel CVE team has assigned CVE-2024-56775 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 6.12.4 with commit 8cb2f6793845f135b28361ba8e96901cae3e5790 |
| Fixed in 6.13 with commit 27227a234c1487cb7a684615f0749c455218833a |
| |
| 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-2024-56775 |
| 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/dc/core/dc.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/8cb2f6793845f135b28361ba8e96901cae3e5790 |
| https://git.kernel.org/stable/c/27227a234c1487cb7a684615f0749c455218833a |
