Loading vulnerability…
CVE-2025-40304 is an out-of-bounds write vulnerability in the Linux kernel fbdev subsystem's bit_putcs text-rendering path. When text is rendered near framebuffer boundaries, image width can be clipped and the backing buffer sized for that clipped width while the character count retains its larger, original value. The resulting mismatch passed to the aligned or unaligned rendering helpers can cause writes beyond the vmalloc-backed framebuffer allocation. The upstream fix adds screen-boundary checks, rejects off-screen Y positions, clips image dimensions, terminates rendering for off-screen X positions, and synchronizes the character count with clipped width.
Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.
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.
If you can’t patch tonight, do this now.
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.
26 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Linux kernel out-of-bounds write vulnerability in fbdev that can lead to privilege escalation, information disclosure, or denial of service.
A Linux kernel fbdev out-of-bounds write vulnerability that can lead to privilege escalation, information disclosure, or denial of service.
A Linux kernel fbdev out-of-bounds write vulnerability that can lead to privilege escalation, information disclosure, or denial of service.
A Linux kernel out-of-bounds write vulnerability in fbdev that can lead to privilege escalation, information disclosure, or denial of service.
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.