SB20260917160 - Integer overflow in Linux kernel drm sysfb driver

Description

This security bulletin contains information about 1 vulnerability.

1) Integer overflow (CVE-ID: CVE-2026-89806)

CWE-ID: CWE-190 - Integer overflow

CVSSv4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

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.

Remediation

Install update from vendor's website.

References

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