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CVE-2021-47383 is an out-of-bounds vmalloc access in the Linux kernel framebuffer-console path in the tty subsystem. A userspace caller can submit FBIOPUT_VSCREENINFO with an incompletely initialized fb_var_screeninfo containing only xres, yres, and bits_per_pixel. If its relevant values match the preceding configuration, vc_resize() can decide that resizing is unnecessary and skip resize_screen(), leaving screen information incomplete. updatescrollmode() then calculates an invalid fbcon_display->vrows value; real_y() derives an invalid y coordinate, and imageblit accesses memory outside the intended vmalloc allocation. The upstream correction invokes resize_screen() even where no resize is needed so that fb_var_screeninfo is completed and normalized.
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What an attacker gets, and what they’ve been doing with it.
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No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Linux kernel TTY imageblit out-of-bounds vmalloc access flaw.
Linux kernel TTY imageblit out-of-bounds vmalloc access vulnerability.
Linux kernel TTY imageblit out-of-bounds vmalloc memory-access vulnerability.
An out-of-bounds vmalloc access flaw in the Linux kernel tty imageblit functionality.
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.