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CVE-2023-3161 is an incorrect bitwise-shift vulnerability in the Linux kernel Framebuffer Console (fbcon) implementation. The fbcon_set_font() function did not validate supplied font width and height values before using them in shift operations. Supplying both dimensions greater than 32 can cause a shift-out-of-bounds condition, resulting in undefined kernel behavior and a potential denial of service.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
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.
14 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Linux kernel framebuffer console shift-out-of-bounds vulnerability.
Linux kernel framebuffer console shift-out-of-bounds vulnerability.
Linux kernel framebuffer console shift-out-of-bounds flaw in fbcon_set_font().
Linux kernel shift-out-of-bounds vulnerability in fbcon_set_font().
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.