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CVE-2025-40304 is an out-of-bounds write vulnerability in the Linux kernel's fbdev framebuffer text-rendering function bit_putcs. Insufficient boundary checks allow writes beyond framebuffer boundaries when rendering text near screen edges. When image width is clipped without updating the character count, bit_putcs_aligned and bit_putcs_unaligned receive inconsistent parameters: the buffer is allocated for the clipped width, while cnt retains the original larger character count. This mismatch causes writes beyond the allocated buffer and can result in kernel memory corruption.
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An out-of-bounds write vulnerability in the Linux kernel's framebuffer text-rendering code. Missing screen-boundary checks and mismatched character counts after width clipping can cause writes beyond allocated buffers. The reference assigns CVSS v3 severity High (7.8), with local access and low privileges required. The prescribed fix is to update the Echo linux package and related packages to version 6.1.159-1 or later.
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.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.