In the Linux kernel, the following vulnerability has been resolved:
drm/gem: Fix inconsistent plane dimension calculation in drm_gem_fb_init_with_funcs()
drm_gem_fb_init_with_funcs() computes sub-sampled plane dimensions
using plain integer division:
unsigned int width = mode_cmd->width / (i ? info->hsub : 1);
unsigned int height = mode_cmd->height / (i ? info->vsub : 1);
However, the ioctl-level framebuffer_check() in drm_framebuffer.c uses
drm_format_info_plane_width/height() which round up dimensions via
DIV_ROUND_UP(). This inconsistency corrupts the subsequent GEM object
size check for certain pixel format and dimension combinations.
For example, with NV12 (vsub=2) and a 1-pixel-tall framebuffer the
GEM size validation path sees height=0 instead of height=1. The
expression (height - 1) then wraps to UINT_MAX as an unsigned int,
causing min_size to overflow and wrap back to a small value. A tiny
GEM object therefore passes the size guard, yet when the GPU accesses
the chroma plane it will read or write memory beyond the object's
bounds.
Fix by replacing the open-coded divisions with drm_format_info_plane_width()
and drm_format_info_plane_height(), which use DIV_ROUND_UP() and match
the calculation already used in framebuffer_check().
References
Configurations
Configuration 1 (hide)
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History
10 Jun 2026, 19:17
| Type | Values Removed | Values Added |
|---|---|---|
| CPE | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* |
|
| References | () https://git.kernel.org/stable/c/11427ad6c9f0def5ce567982b785da3191946430 - Patch | |
| References | () https://git.kernel.org/stable/c/1a17ea9861e89585361caa8bc231bd22dc6dbe7d - Patch | |
| References | () https://git.kernel.org/stable/c/1da4ab7189f1064b3b712b388772c008b4d82580 - Patch | |
| References | () https://git.kernel.org/stable/c/22922f7dae74409fc4bf0f1142710cb6b8ce8cc2 - Patch | |
| References | () https://git.kernel.org/stable/c/3d4c2268bd7243c3780fe32bf24ff876da272acf - Patch | |
| References | () https://git.kernel.org/stable/c/6b992591e04f2cce813bcf239b354f375bbf84d3 - Patch | |
| References | () https://git.kernel.org/stable/c/adfc5ba4ef4dd2bca5969f40e8fc7b41fb3902ad - Patch | |
| References | () https://git.kernel.org/stable/c/c5fc49d8470c5ebf3b41607600f277158f159950 - Patch | |
| First Time |
Linux linux Kernel
Linux |
|
| CWE | CWE-787 |
01 Jun 2026, 17:17
| Type | Values Removed | Values Added |
|---|---|---|
| References |
|
30 May 2026, 11:17
| Type | Values Removed | Values Added |
|---|---|---|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 7.8 |
28 May 2026, 10:16
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-05-28 10:16
Updated : 2026-06-10 19:17
NVD link : CVE-2026-46209
Mitre link : CVE-2026-46209
CVE.ORG link : CVE-2026-46209
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-787
Out-of-bounds Write