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CVE-2026-89806: drm/sysfb: ofdrm: Fix integer overflow in fb_size calculation

• Severity: high (CVSS 8.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-16 · updated 2026-10-21

Description

In the Linux kernel, the following vulnerability has been resolved: drm/sysfb: ofdrm: Fix integer overflow in fb_size calculation The framebuffer size calculation `fb_size = linebytes * height` can overflow when both values are large (e.g., 46341 * 46341 > INT_MAX). Since linebytes and height are both int types, the multiplication is performed as int * int, which results in undefined behavior on overflow. Use check_mul_overflow() to detect and prevent this overflow, consistent with the approach used in simpledrm.c and corebootdrm.c.

Affected products

• Linux kernel: 6.2 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0cec951667a624fafaca2695c46042f45851caec
• https://git.kernel.org/stable/c/711fe7949d37656a5586244afee9523b9e5e37e9
• https://git.kernel.org/stable/c/c6f48e59ece0123f6a11527ad4d89b21c2d65b87
• https://git.kernel.org/stable/c/d9daf9a6e7a6f82ef338a09386eefc6807100d3f
• https://git.kernel.org/stable/c/ded6ad826fe0fd059333d3a3b3e1742c8e45ff41

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