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CVE-2021-47338 is a use-after-free flaw in the Linux kernel framebuffer memory (fbmem) subsystem. During framebuffer mode-setting handling, fb_delete_videomode() deleted a video mode irrespective of whether fbcon_mode_deleted() indicated that the mode was still in use. Subsequent mode comparison in fb_mode_is_equal() could dereference the freed mode object. The flaw was introduced in Linux kernel 5.3.
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No public exploit code observed for this vulnerability.
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4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Linux kernel framebuffer mode-management flaw.
A medium-severity Linux kernel framebuffer-memory (fbmem) vulnerability involving deletion of a display mode that remains in use. The referenced automated assessment identifies a possible KASAN-detected use-after-free condition and estimates low impact.
A use-after-free vulnerability (CWE-416) in the Linux kernel fbmem subsystem, triggered by deleting a video mode that remains in use. It can cause crashes or undefined behavior through access to freed memory.
A use-after-free vulnerability in the Linux kernel framebuffer device (fbdev) core. A video mode could be deleted while still in use because fb_delete_videomode() did not act on the preceding fbcon_mode_deleted() result.
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Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.