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CVE-2026-46209 is a memory-safety vulnerability in the Linux kernel DRM/GEM framebuffer initialization function drm_gem_fb_init_with_funcs(). The function calculates subsampled plane dimensions using integer division that rounds down, whereas framebuffer_check() uses DRM helpers that round up. For certain pixel formats and dimensions, this discrepancy causes unsigned wraparound in the GEM object size calculation. For example, an NV12 framebuffer with vertical subsampling of two and a height of one pixel produces a calculated chroma-plane height of zero. Subtracting one wraps to UINT_MAX, and the subsequent min_size calculation overflows to a small value. An undersized GEM object can consequently pass validation, allowing GPU accesses beyond its bounds.
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No public exploit code observed for this vulnerability.
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19 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Linux kernel DRM/GEM vulnerability caused by inconsistent framebuffer plane dimension calculations. For certain pixel formats and dimensions, unsigned integer underflow and subsequent size-calculation overflow bypass GEM object size validation, allowing out-of-bounds GPU memory access. The reference assigns a CVSS v3 base score of 7.8, with local access and low privileges required. Affected Google kernel packages should be updated to version 18867.381.161 or later.
A vulnerability addressed in Huawei EulerOS UVP 2.10.1 kernel-related packages.
A Linux kernel drm/gem vulnerability involving inconsistent plane dimension calculation in drm_gem_fb_init_with_funcs(), fixed in this Red Hat advisory.
A Linux kernel drm/gem vulnerability involving inconsistent plane dimension calculation in drm_gem_fb_init_with_funcs().
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.