CVE-2026-46209

Advisory lineage Upstream: 0 Downstream: 23
Analyzed
Published: 28 May 2026, 09:40
Last modified:14 Jun 2026, 18:02

Vulnerability Summary

Overall Risk (default)
medium
31/100
CVSS Score
7.8 HIGH
v3.1 (cve.org)
EPSS Score
0.14% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

28 May 2026, 09:40
Published
Vulnerability first disclosed
14 Jun 2026, 18:02
Last Modified
Vulnerability information updated

Description

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().

CVSS Metrics

  • v3.1•HIGH•Score: 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Trends

Current EPSS score: 0.14%• Percentile: 4%

Techniques & Countermeasures

  • CWE-787•Out-of-bounds Write

    The product writes data past the end, or before the beginning, of the intended buffer.

Affected Systems

  • linux•linux

    ≥ 4c3dbb2c312c9fafbac30d98c523b8b1f3455d78, < 11427ad6c9f0def5ce567982b785da3191946430 | ≥ 4c3dbb2c312c9fafbac30d98c523b8b1f3455d78, < adfc5ba4ef4dd2bca5969f40e8fc7b41fb3902ad | ≥ 4c3dbb2c312c9fafbac30d98c523b8b1f3455d78, < 22922f7dae74409fc4bf0f1142710cb6b8ce8cc2 | ≥ 4c3dbb2c312c9fafbac30d98c523b8b1f3455d78, < 6b992591e04f2cce813bcf239b354f375bbf84d3 | ≥ 4c3dbb2c312c9fafbac30d98c523b8b1f3455d78, < 1da4ab7189f1064b3b712b388772c008b4d82580 | ≥ 4c3dbb2c312c9fafbac30d98c523b8b1f3455d78, < 1a17ea9861e89585361caa8bc231bd22dc6dbe7d | ≥ 4c3dbb2c312c9fafbac30d98c523b8b1f3455d78, < c5fc49d8470c5ebf3b41607600f277158f159950 | ≥ 4c3dbb2c312c9fafbac30d98c523b8b1f3455d78, < 3d4c2268bd7243c3780fe32bf24ff876da272acf | 4.14

  • linux•linux kernel

    ≥ 4.14, < 5.10.258 | ≥ 5.11, < 5.15.209 | ≥ 5.16, < 6.1.175 | ≥ 6.2, < 6.6.140 | ≥ 6.7, < 6.12.90 | ≥ 6.13, < 6.18.32 | ≥ 6.19, < 7.0.9 | 7.1:rc1

References (8)