| 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-2024-46712: drm/vmwgfx: Disable coherent dumb buffers without 3d |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| drm/vmwgfx: Disable coherent dumb buffers without 3d |
| |
| Coherent surfaces make only sense if the host renders to them using |
| accelerated apis. Without 3d the entire content of dumb buffers stays |
| in the guest making all of the extra work they're doing to synchronize |
| between guest and host useless. |
| |
| Configurations without 3d also tend to run with very low graphics |
| memory limits. The pinned console fb, mob cursors and graphical login |
| manager tend to run out of 16MB graphics memory that those guests use. |
| |
| Fix it by making sure the coherent dumb buffers are only used on |
| configs with 3d enabled. |
| |
| The Linux kernel CVE team has assigned CVE-2024-46712 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.10.4 with commit af6441e6f3d41e95bfc5bfc11960c259bb4f0f11 and fixed in 6.10.8 with commit c45558414b8f2e0b9dc34eb8f9d4e8359b887681 |
| |
| 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-2024-46712 |
| 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/vmwgfx/vmwgfx_surface.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/c45558414b8f2e0b9dc34eb8f9d4e8359b887681 |
| https://git.kernel.org/stable/c/e9fd436bb8fb9b9d31fdf07bbcdba6d30290c5e4 |
