CVE-2026-68165

Technical Description

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

mm/damon/core: validate ranges in damon_set_regions()

DAMON core logic assumes zero length regions don't exist. However, a few

DAMON API callers including DAMON_SYSFS, DAMON_RECLAIM and DAMON_LRU_SORT

allow users to set empty monitoring target regions. This could result in

WARN_ONCE() on CONFIG_DAMON_DEBUG_SANITY enabled kernel, and

divide-by-zero from damon_merge_two_regions().

For example, the WANR_ONCE() can be triggered like below.

# grep DAMON_DEBUG_SANITY /boot/config-$(uname -r)

# CONFIG_DAMON_DEBUG_SANITY=y

# damo start

# cd /sys/kernel/mm/damon/admin/kdamonds/0

# echo 0 > contexts/0/targets/0/regions/0/start

# echo 0 > contexts/0/targets/0/regions/0/end

# echo commit > state

# dmesg

[....]

[ 73.705780] ------------[ cut here ]------------

[ 73.707552] start 0 >= end 0

[ 73.708452] WARNING: mm/damon/core.c:359 at damon_new_region+0x6e/0x80, CPU#1: kdam

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References