drm/sysfb: ofdrm: Fix integer overflow in fb_size calculation
CVE-2026-89806 · published 16 Sept 2026
How serious is it
- Severity: high, CVSS score 8.4 out of 10.
- No exploit prediction (EPSS) score yet.
- Not on the CISA list of exploited vulnerabilities.
- No public exploit in Exploit-DB.
Is your app affected by CVE-2026-89806?
Paste this prompt into Claude Code, Cursor or any AI coding tool: it runs a free Shippable scan of your project and fixes what it finds. Built with Lovable, Bolt or v0? Scan your live app. Or upload your package file.
Who is affected
- Linux Linux: c8a17756c42581ba1a567d1dd3b69e8f5619a7d8 to < 0cec951667a624fafaca2695c46042f45851caec, c8a17756c42581ba1a567d1dd3b69e8f5619a7d8 to < 711fe7949d37656a5586244afee9523b9e5e37e9, c8a17756c42581ba1a567d1dd3b69e8f5619a7d8 to < ded6ad826fe0fd059333d3a3b3e1742c8e45ff41, c8a17756c42581ba1a567d1dd3b69e8f5619a7d8 to < d9daf9a6e7a6f82ef338a09386eefc6807100d3f
- Linux Linux: 6.2
How to check
- Find out whether you run the affected product and which version, then compare it with the versions above.
How to fix
Copies a prompt for Claude Code, Cursor or Codex that asks it to check whether you run this product.
- Apply the vendor's update or mitigation from the references below. If there is none yet, limit exposure of the affected service until there is.
- If a vulnerable version was live, check your logs and rotate the secrets that server could read.
The advisory
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.
Check your whole app
Dependencies are only half of it. Free and read-only: before you push, run npx shippable-dev scan localhost:3000 in your project folder, no account needed. For your live app, you prove it's yours with a one-line tag first.
References
- git.kernel.org/stable/c/0cec951667a624fafaca2695c46042f45851caec
- git.kernel.org/stable/c/711fe7949d37656a5586244afee9523b9e5e37e9
- git.kernel.org/stable/c/ded6ad826fe0fd059333d3a3b3e1742c8e45ff41
- git.kernel.org/stable/c/d9daf9a6e7a6f82ef338a09386eefc6807100d3f
- git.kernel.org/stable/c/c6f48e59ece0123f6a11527ad4d89b21c2d65b87
Merged from CVE List. Last updated 26 Oct 2026. All vulnerabilities · RSS · JSON