CVE-2025-38519 – “Linux Kernel Divide by Zero Vulnerability in damon_get_intervals_score()”

CVE ID : CVE-2025-38519

Published : Aug. 16, 2025, 11:15 a.m. | 45 minutes ago

Description : In the Linux kernel, the following vulnerability has been resolved:

mm/damon: fix divide by zero in damon_get_intervals_score()

The current implementation allows having zero size regions with no special
reasons, but damon_get_intervals_score() gets crashed by divide by zero
when the region size is zero.

[ 29.403950] Oops: divide error: 0000 [#1] SMP NOPTI

This patch fixes the bug, but does not disallow zero size regions to keep
the backward compatibility since disallowing zero size regions might be a
breaking change for some users.

In addition, the same crash can happen when intervals_goal.access_bp is
zero so this should be fixed in stable trees as well.

Severity: 0.0 | NA

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