High 7.8Published May 28, 2026

CVE-2026-46209drm/gem: Fix inconsistent plane dimension calculation in drm_gem_fb_init_with_funcs()

Updated under an hour ago (Oct 26, 2026, 6:00 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-190
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 4c3dbb2c312c9fafbac30d98c523b8b1f3455d78 before 11427ad6c9f0def5ce567982b785da3191946430; from 4c3dbb2c312c9fafbac30d98c523b8b1f3455d78 before adfc5ba4ef4dd2bca5969f40e8fc7b41fb3902ad; from 4c3dbb2c312c9fafbac30d98c523b8b1f3455d78 before 22922f7dae74409fc4bf0f1142710cb6b8ce8cc2; from 4c3dbb2c312c9fafbac30d98c523b8b1f3455d78 before 6b992591e04f2cce813bcf239b354f375bbf84d3; 4c3dbb2c312c9fafbac30d98c523b8b1f3455d78 builds before 1da4ab7189f1064b3b712b388772c008b4d82580; 4c3dbb2c312c9fafbac30d98c523b8b1f3455d78 builds before 1a17ea9861e89585361caa8bc231bd22dc6dbe7d; from 4c3dbb2c312c9fafbac30d98c523b8b1f3455d78 before c5fc49d8470c5ebf3b41607600f277158f159950; 4c3dbb2c312c9fafbac30d98c523b8b1f3455d78 builds before 3d4c2268bd7243c3780fe32bf24ff876da272acf	CNA record
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name)	all versions	CISA ADP
linux linux_kernel linux:linux_kernel	from 4.14 before 5.10.258; from 5.11 before 5.15.209; from 5.16 before 6.1.175; from 6.2 before 6.6.140; from 6.7 before 6.12.90; from 6.13 before 6.18.32; from 6.19 before 7.0.9; 7.1	NVD

References

References

https://git.kernel.org/stable/c/11427ad6c9f0def5ce567982b785da3191946430	patch
https://git.kernel.org/stable/c/adfc5ba4ef4dd2bca5969f40e8fc7b41fb3902ad	patch
https://git.kernel.org/stable/c/22922f7dae74409fc4bf0f1142710cb6b8ce8cc2	patch
https://git.kernel.org/stable/c/6b992591e04f2cce813bcf239b354f375bbf84d3	patch
https://git.kernel.org/stable/c/1da4ab7189f1064b3b712b388772c008b4d82580	patch
https://git.kernel.org/stable/c/1a17ea9861e89585361caa8bc231bd22dc6dbe7d	patch
https://git.kernel.org/stable/c/c5fc49d8470c5ebf3b41607600f277158f159950	patch
https://git.kernel.org/stable/c/3d4c2268bd7243c3780fe32bf24ff876da272acf	patch
https://cert-portal.siemens.com/productcert/html/ssa-784472.html

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.