| From bippy-d175d3acf727 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-2024-26979: drm/vmwgfx: Fix possible null pointer derefence with invalid contexts |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| drm/vmwgfx: Fix possible null pointer derefence with invalid contexts |
| |
| vmw_context_cotable can return either an error or a null pointer and its |
| usage sometimes went unchecked. Subsequent code would then try to access |
| either a null pointer or an error value. |
| |
| The invalid dereferences were only possible with malformed userspace |
| apps which never properly initialized the rendering contexts. |
| |
| Check the results of vmw_context_cotable to fix the invalid derefs. |
| |
| Thanks: |
| ziming zhang(@ezrak1e) from Ant Group Light-Year Security Lab |
| who was the first person to discover it. |
| Niels De Graef who reported it and helped to track down the poc. |
| |
| The Linux kernel CVE team has assigned CVE-2024-26979 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 4.20 with commit 9c079b8ce8bf and fixed in 5.10.215 with commit c560327d900b |
| Issue introduced in 4.20 with commit 9c079b8ce8bf and fixed in 5.15.154 with commit 899e154f9546 |
| Issue introduced in 4.20 with commit 9c079b8ce8bf and fixed in 6.1.84 with commit 07c3fe923ff7 |
| Issue introduced in 4.20 with commit 9c079b8ce8bf and fixed in 6.6.24 with commit ff41e0d4f3fa |
| Issue introduced in 4.20 with commit 9c079b8ce8bf and fixed in 6.7.12 with commit 9cb3755b1e36 |
| Issue introduced in 4.20 with commit 9c079b8ce8bf and fixed in 6.8.3 with commit 585fec7361e7 |
| Issue introduced in 4.20 with commit 9c079b8ce8bf and fixed in 6.9 with commit 517621b70600 |
| |
| 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-2024-26979 |
| 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_execbuf.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/c560327d900bab968c2e1b4cd7fa2d46cd429e3d |
| https://git.kernel.org/stable/c/899e154f9546fcae18065d74064889d08fff62c2 |
| https://git.kernel.org/stable/c/07c3fe923ff7eccf684fb4f8c953d0a7cc8ded73 |
| https://git.kernel.org/stable/c/ff41e0d4f3fa10d7cdd7d40f8026bea9fcc8b000 |
| https://git.kernel.org/stable/c/9cb3755b1e3680b720b74dbedfac889e904605c7 |
| https://git.kernel.org/stable/c/585fec7361e7850bead21fada49a7fcde2f2e791 |
| https://git.kernel.org/stable/c/517621b7060096e48e42f545fa6646fc00252eac |
