SB20260816268 - Division by zero in Linux kernel src dml2_core driver
Published: August 16, 2026
Security Bulletin ID
SB20260816268
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Division by zero (CVE-ID: CVE-2026-74449)
CWE-ID: CWE-369 - Divide By Zero
CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to divide-by-zero in calculate_mcache_setting in the AMD display driver when processing a zero-area viewport. A local user can trigger display mode handling with a degenerate viewport to cause a denial of service.
The issue can also cause an underflow on the num_mcaches value.
Remediation
Install update from vendor's website.