Integer overflow in Linux kernel - CVE-2026-89806

Vulnerability details

The vulnerability allows a remote attacker to execute arbitrary code, disclose sensitive information, or cause a denial of service.

The vulnerability exists due to an integer overflow in the framebuffer size calculation in drm/sysfb/ofdrm.c when creating an ofdrm device with large linebytes and height values. A remote attacker can provide values that cause the framebuffer size calculation to overflow to execute arbitrary code, disclose sensitive information, or cause a denial of service.

Affected software

How to mitigate CVE-2026-89806

External References

• https://git.kernel.org/stable/c/c6f48e59ece0123f6a11527ad4d89b21c2d65b87
• https://git.kernel.org/stable/c/d9daf9a6e7a6f82ef338a09386eefc6807100d3f
• https://git.kernel.org/stable/c/ded6ad826fe0fd059333d3a3b3e1742c8e45ff41

Related Security Bulletins

• Integer overflow in Linux kernel drm sysfb driver