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A vulnerability in the Linux kernel DRM/GEM framebuffer initialization path allows incorrect validation of GEM object sizes for certain subsampled pixel formats. In drm_gem_fb_init_with_funcs(), plane width and height for subsampled planes were calculated using plain integer division, while framebuffer_check() in drm_framebuffer.c used drm_format_info_plane_width() and drm_format_info_plane_height(), which round up dimensions with DIV_ROUND_UP(). This inconsistency caused the two validation paths to disagree on plane dimensions. For formats such as NV12, a small framebuffer dimension could cause a subsampled plane height to be computed as zero in drm_gem_fb_init_with_funcs(). Subsequent unsigned arithmetic on that zero value, including a height-minus-one expression, could wrap to UINT_MAX and cause the minimum required GEM size calculation to overflow back to a small value. As a result, an undersized GEM object could incorrectly pass the size check, after which GPU access to the affected plane could read or write beyond the bounds of the backing object.
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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().
A kernel vulnerability in drm/gem involving inconsistent plane dimension calculation in drm_gem_fb_init_with_funcs().
A Linux kernel vulnerability in drm/gem involving inconsistent plane dimension calculation in drm_gem_fb_init_with_funcs().
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Cross-references every affected SKU, including bundled OEM variants.
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