CVE-2026-89806 Linux Kernel drm/sysfb ofdrm - Integer Overflow

Linux kernel drm/sysfb ofdrm contains an integer overflow caused by unchecked multiplication of linebytes and height in framebuffer size calculation, letting attackers cause undefined behavior or potential denial of service, exploit requires crafted input triggering large framebuffer sizes.

CVSS base score 8.4 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.20% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Integer Overflow
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
16 September 2026
Updated
15 October 2026

Vendor fix

Update to the latest Linux kernel version containing the fix using check_mul_overflow() to prevent integer overflow.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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