Division by zero in Linux kernel - CVE-2026-74643
Published: August 24, 2026
Vulnerability identifier: #VU144896
CSH Severity: Low
CVSS v4: 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]
CVE-ID: CVE-2026-74643
CWE-ID: CWE-369
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to division by zero in damos_quota_score() in the DAMON_SAMPLE_MTIER module when handling zero node0_mem_used_bp or node0_mem_free_bp parameter values during module configuration. A local user can set a zero target value and enable the module to cause a denial of service.
The issue can be triggered through sysfs parameter writes before enabling the sample module.
Affected software
Linux kernel
How to mitigate CVE-2026-74643
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3